A high-quality fitting ensures quick connection and disconnection, a reliable seal, no air leaks, and a long service life under heavy-duty conditions. A poor-quality fitting results in pressure losses, downtime, and unplanned maintenance.

Nitto Kohki and the Cupla Philosophy

Nitto Kohki quick-connect compressed air fittings allow you to connect and disconnect hoses and tools with a single motion, without tools and with minimal air leakage. The automatic locking mechanism ensures a reliable seal during use.

Nitto Kohki’s design philosophy: Each product family is designed for a specific pressure range and application, with materials and seals selected based on the fluid and operating environment. The result is a broad yet cohesive product line, where each model has a specific place and a technical reason for existing.

The Nitto Kohki product line, distributed in Italy by SIRA S.p.A., is available on our website.

How a Nitto Kohki quick-connect fitting works

The operating principle of a Cupla quick-connect coupling is mechanically simple: the coupling consists of two parts— a plug and a socket—which connect with a single insertion motion and are released by pressing a ring or an external ring nut. Internally, a check valve ensures that air does not escape when the two parts are separated and that flow resumes immediately upon connection.

The operator can disconnect a tool while the system is still under pressure, without the compressed air escaping suddenly. This feature makes a significant difference in high-usage environments, both in terms of operator safety and the system’s energy efficiency.

The Cupla Series for Compressed Air

The Nitto Kohki product line is divided into distinct families based on flow rate and application. Understanding the differences is the first step in choosing the right fitting for your system and tools.

Hi Cupla – The Standard Coupling for Pneumatic Tools

The Hi Cupla is the most widely used family of couplings and the industry standard for connecting pneumatic tools to factory air systems. Designed for low pressure (up to approximately 10 bar), it is available in steel (for air) and brass or stainless steel, depending on the application. The Hi Cupla Ace variant is the lighter, plastic version, suitable for both air and water, and particularly popular where the weight of the connectors on the line is a factor.

Super Cupla – Lightweight Design for Handheld Tools

The Super Cupla is specifically designed for portable tools—such as screwdrivers, grinders, and air guns—where the weight of the coupling is a significant factor. Its aluminum body makes it significantly lighter than steel versions while offering the same performance, reducing operator fatigue during continuous use.

Full Blow Cupla – Maximum flow rate, minimal pressure drop

The Full Blow Cupla features a fully open-port valve that minimizes pressure drop during airflow. This design allows for a significantly higher flow rate for the same diameter compared to standard compressed air fittings, reducing the required supply air volume and lowering the compressor’s energy consumption. The ideal choice for high-air-consumption tools or lines where pressure drop is an operational issue.

SP Cupla Type A – Versatility for Different Fluids

The SP Cupla Type A is Nitto Kohki’s coupling for applications beyond compressed air: water, hydraulic oils, and chemicals. Designed for working pressures ranging from 15 to 75 bar, it is available in brass, stainless steel, and steel, with NBR, FKM, or EPDM seals depending on the fluid. Sizes range from 1/8″ to 2″. The dual check valve design prevents fluid leakage on both the line side and the tool side during disconnection, which is essential for fluids other than air.

Why the Choice of Fitting Matters: Impact on Performance and Costs

A quick-connect fitting might seem like a trivial, small, or inexpensive component—one that is often purchased without much thought. In reality, when managing an industrial pneumatic system, the quality and proper selection of compressed-air fittings have a direct impact on three critical operating parameters.

1. Pressure Drop and Energy Consumption

Every fitting introduces flow resistance, which results in a pressure drop. A poorly sized or poorly constructed fitting can cause a pressure loss of 0.5–1 bar between the supply line and the tool, enough to significantly degrade its performance. Nitto Kohki’s Full Blow Cupla is specifically designed to minimize this loss; choosing the correct diameter (a fitting size appropriate for the tool’s required flow rate) is the second factor. It is estimated that leaks in fittings and connections account for an average of 20–30% of total compressed air consumption in a poorly managed industrial network.

2. Reliability and Downtime

A fitting that leaks—even slightly—is a fitting that will wear out sooner than expected and will most likely cause a shutdown. Nitto Kohki compressed air fittings are designed to withstand thousands of connection/disconnection cycles while maintaining a consistent seal. The build quality of the locking mechanism and internal seals directly determines the component’s service life.

3. Operator Safety

The double check valve in the fittings ensures that no sudden release of compressed air occurs when the connection is disconnected, which poses a real risk to operators, especially at pressures above 6 bar. Workplace safety regulations for environments with pneumatic systems, including the Italian reference to the Legislative Decree No. 81/2008 (Consolidated Law on Safety) , require that the components of the pneumatic system ensure operator safety under all operating conditions, including when the system is disconnected while under pressure.

How to Choose the Right Nitto Kohki Fitting

Selecting the right fitting requires answering four key questions:

Why Choose SIRA S.p.A. for Custom-Made Compressed Air Fittings

At SIRA S.p.A., we distribute Nitto Kohki quick-connect compressed air fittings, a range that covers pressures from low to over 700 bar, fluids ranging from compressed air to water to hydraulic oils, and applications ranging from assembly shops to more specialized fields such as the medical, pharmaceutical, and injection molding industries.

The technical team at SIRA S.p.A. can help you select the right fitting based on your system’s specifications. To request information or view the complete Nitto Kohki catalog, visit the relevant section or contact us.

FAQ – Frequently Asked Questions About Nitto Compressed Air Fittings

At SIRA S.p.A., we distribute screw feeding systems Nitto Seiko, a Japanese manufacturer founded in 1938 and a global leader in this technology, integrating them into the automated screwdriving solutions developed by our Siratec division.

What are automatic screw feeding systems?

Automatic screw feeding systems are industrial solutions designed to transport, orient, and position screws fully automatically, eliminating the need for an operator or robot to handle each screw manually. The screw travels from the feed hopper to the screwdriver head in a continuous sequence, without any manual interruptions.

The operating cycle of these systems consists of distinct phases, designed to integrate into semi-automatic assembly stations or robotic production lines:

• Loading and Orientation: The screws are fed in bulk into a hopper or a circular feeder. The system—whether vibrating or rotary—aligns them all in the same direction before they move along the conveyor path.
• Sorting: A mechanical sorter intercepts and rejects screws that are not positioned correctly, allowing only those with the correct orientation to continue through the line.
• Pneumatic transfer: A jet of compressed air propels the screw through a transparent tube directly to the tip of the screwdriver in a fraction of a second.
• Tightening: When the operator pulls the trigger, or the robot starts the cycle, the screw is already in position and ready to be tightened to the set torque, without any intermediate steps.

Available Nitto Seiko Power Supplies

FM Series – Tilting Blade Feeders (FM503H, FM801H)

Tilting-blade feeders are the most common solution for the automatic feeding of standard screws. The operating principle is simple and effective: a vibrating blade picks up the screws from the hopper and orients them correctly so they fall into the feed tube. The FM503H and FM801H models cover different screw ranges and differ in hopper capacity and feed rate.

The FM series is particularly appreciated for its ease of setup when changing screw formats: replacing the limit switch and adjusting the orientation channel can be done without specialized tools, reducing production changeover times.

SH Series – SH Auxiliary Loader (SH300, SH801)

The SH series integrates a tilting blade feeder with an additional screw feeder, increasing the system’s operating time without the need for frequent stops to replenish supplies. The SH300 and SH801 models are designed to work in tandem with the FM series screwdriving motors, ensuring a continuous supply of screws suitable for high-volume production lines. Both models are documented with 2D and 3D drawings on the SIRA S.p.A. website.

Semi-Automatic Feeders

1. NJ and NJR Series – Ohtake Automatic Feeders for Standard Screws

The NJ series (and NJL variant) and NJR series (with NJRL variant) comprise a range of automatic screw feeders in standard sizes, designed for compact integration into semi-automated manual assembly stations. The modular design allows the feeder to be configured with different outlet channel lengths; the model code includes the specific dimensions to adapt to the geometry of each workstation.

The NJR series is the robotic version, which is useful when the workstation configuration requiresthe screwdriver to move in and pick up the screw from a fixed position. Both series are available with complete downloadable 2D/3D documentation.

2. SS Series – Compact Power Supplies for Special Applications

The SS Series is a family of compact power supplies designed for applications where space is limited or the installation site requires a power supply with a minimal footprint. The more compact design does not compromise operational reliability: the screw selection and orientation mechanism is the same as that of the larger series, but in a smaller format.

3. OM-26 Series – Ohtake High-Capacity Power Supplies

For very high-volume production lines that require long intervals between refills, the OM-26 series offers a large-capacity hopper, available in the OM-26M (standard) and OM-26R (robot) models, which drastically reduces the frequency of operator intervention for screw loading. Ideal for continuous, two-shift lines where every stop for refilling represents a direct cost.

4. NSB and NSR Series – Belt Feeding Systems

The NSB and NSR series represent a different approach to automatic feeding: instead of a vibrating hopper, they use a feed belt that allows for the handling of non-standard or particularly delicate screws that vibrating hopper systems might damage. They are suitable for screws with special coatings, non-standard heads, or materials sensitive to vibration.

How do Nitto Seiko screw feeding systems work?

A Nitto Seiko system is not a standalone component: it is part of an integrated fastening system that includes the feeder, the fastening motor ( Estic ENRZ series, shown in the Automation section of the website), the clamping head, and the process controller. SIRA S.p.A. supplies all these components and, through its Siratec division, integrates them into complete turnkey solutions.

The operating cycle of a complete Nitto Seiko system is as follows:

• Loading screws into the hopper: The operator loads the loose screws into the feeder’s hopper; the system automatically orients them
• Transport to the clamping point: The selected screw is transported through a flexible hose to the screwdriver, either by gravity or compressed air
• Tool retention: The screw is held in place at the screwdriver’s chuck by a vacuum or mechanical system
• Tightening: The screwdriver tightens the screw according to the programmed parameters (torque, angle, speed)
• Verification: The inspector verifies that the tightening is within specifications and indicates OK/NOK
• Next cycle: The feeder automatically feeds the next screw

What technical specifications should you consider when choosing an automatic feeder?

Selecting the most suitable power supply model requires an analysis of several key technical variables:

For any technical evaluation, the SIRA S.p.A. team is available to assist you in selecting the right model based on your process specifications.

FAQ – Frequently Asked Questions About Automatic Screw Feeding Systems

Simplicity is the ultimate form of sophistication. This principle perfectly reflects the philosophy behind SIRAFLEX spring balancers—the tools that SIRA S.p.A. develops and offers to make industrial work less strenuous, more precise, and safer. When a balancer works really well, the operator forgets it’s even there: the tool is always there, exactly where it’s needed, without any effort.

What is a spring balancer? How does it work? What types are available in the SIRAFLEX lineup? And, most importantly, how do you choose the right one for your specific application? From manual assembly stations to automated production lines, and from light loads of just a few ettos up to 120 kg: the right balancer is out there, and at SIRA S.p.A., we’ll help you find it.

What is a spring balancer, and how does it work?

A spring balancer, also known as a balancer or spring-loaded balancer, is a mechanical device that counterbalances the weight of a tool or suspended object, making it feel virtually weightless in the operator’s hand. The operating principle is based on an internal coil spring, sized to exert an upward vertical force equal and opposite to the weight of the load: when the operator releases the tool, the balancer winds it back to its starting position; when the operator pulls it downward, the spring extends, gradually releasing the cable without any perceptible resistance.

The result is that the operator feels as though their tool—whether it’s a 3-kg pneumatic screwdriver, a 5-kg impact wrench, or a 20-kg specialty tool—weighs nothing. This isn’t just a matter of comfort—it’s a matter of process quality and operator health.

Why Spring Balancers Are Essential to Process Quality

1. Ergonomics and the Prevention of Work-Related Illnesses

In the technical literature on occupational health, tools held in the air without support for consecutive hours are among the leading causes of musculoskeletal disorders (MSDs): tendinitis, carpal tunnel syndrome, and shoulder and neck pain. The systematic use of spring-loaded balancers significantly reduces the static load on the joints, as documented in the INAIL guidelines for the prevention of musculoskeletal disorders caused by repetitive work. A fatigued worker is a worker who makes mistakes: the balancer is therefore not only a tool for well-being but also a tool for quality.

2. Clamping Precision

An unsupported screwdriver tends to wobble and tilt during tightening, especially on vertical joints or in awkward positions. The balancer keeps the tool in a stable vertical position, ensuring that the tightening axis is aligned with the screw axis. This detail, which is often overlooked, directly affects the quality of the tightening and the repeatability of the process.

3. Tool Protection

Without a balancer, the tool is placed on surfaces, dropped, or held in awkward positions during work breaks. With the balancer, the tool is always suspended in the correct position, protected from impacts and falls. Given the high cost of electronic torque-controlled screwdrivers, which can run into the thousands of euros, the protection provided by the balancer is an investment that pays for itself quickly.

What are the main features of SIRAFLEX spring balancers?

The SIRAFLEX line from SIRA S.p.A. covers a very wide load range, from 0.5 kg to 120 kg, and is available in various mechanical configurations and housing designs. Choosing the right configuration depends on three main factors: the weight of the load to be suspended, the required vertical stroke, and the physical characteristics of the workstation.

How to Choose the Right SIRAFLEX Balancer for Your Needs

Step 1 – Measure the exact weight of the load

Not the tool’s rated weight, but its actual weight in operating configuration: tool + bit/socket + any air hose or tube. Air hoses and tubes add weight, and if they are secured to the side of the workstation, they significantly affect the balance.

Step 2 – Determine the required vertical travel

The stroke is the vertical distance the operator travels with the tool during the work cycle, from the rest position (tool suspended) to the clamping position (tool brought to the joint). SIRAFLEX models have strokes ranging from 800 mm to over 2,000 mm, depending on the size. An insufficient stroke forces the operator to jerk the tool; an excessive stroke leaves excess cable that gets in the way.

Step 3 – Assess the anchor point

The balancer is anchored to a fixed point above the workstation: a ceiling-mounted balancer, an articulated arm, a sliding rail, or a dedicated structure. The position of the anchor point relative to the tool’s point of use determines the working angle of the cable. SIRA S.p.A. also designs and supplies reaction and positioning arms, available in the “Assembly” section of the website catalog, which allow for the optimization of the suspension geometry even in complex workstations.

Step 4 – Consider the body configuration

SIRAFLEX is available in different housing options to suit various operating environments: a standard painted steel housing for normal environments, a galvanized steel housing for humid environments, and special configurations for environments with specific hygiene requirements. For applications in areas with specific risks, our technical team is available to evaluate the most suitable solution.

Step 5 – Check the Installation and Adjustment

Every SIRAFLEX balancer is equipped with a spring tension adjustment mechanism that allows you to fine-tune the balance after installation. The adjustment is correct when the tool remains stationary in the position in which the operator leaves it, without moving up or down on its own. The team SIRA Service can assist with installation and initial adjustment, and offers periodic maintenance contracts to ensure long-term performance.

What are the typical applications of SIRAFLEX balancers?

How to Perform Maintenance on a SIRAFLEX Balancer

Spring balancers are mechanically simple devices, but their long-term reliability depends on proper periodic maintenance. The main maintenance tasks include:

• Visual inspection of the rope: check for broken strands, twists, or abnormal wear at the sliding point
• Check the end hook: Make sure the tool’s coupling mechanism is intact and shows no signs of deformation
• Cleaning the rewind mechanism: Remove any shavings or dust that could interfere with the smooth running of the cable
• Checking the Adjustment: Periodically check to make sure the balance is still correct, especially after replacing the tool

The SIRA Service program includes periodic maintenance of SIRAFLEX balancers, including tension checks, cable replacement as needed, and functional testing. For information on maintenance contracts, visit the page dedicated to SIRA Service.

Applications and Industries for Spring Balancers

Spring balancers are used in a wide range of industries, including manufacturing, construction, and the automotive sector, and contribute significantly to the efficiency of industrial processes.

• In manufacturing, these devices make it easier to lift and move heavy tools, reducing the risk of fatigue for operators and improving the precision of assembly operations.
• In the construction industry, balancers are used to support tools and equipment, making work at heights safer.
• In the automotive industry, they are used to optimize assembly lines, ensuring a smooth workflow and consistent quality of the final product. Finally, in industry in general, spring balancers offer customized solutions for various applications, proving essential for improving ergonomics and overall productivity.

Regulations and Certifications for Spring Balancers

Spring balancers, such as those in the SIRAFLEX line, must comply with specific regulations and certifications to ensure operator safety and food-grade compatibility in certain applications.

Current regulations establish strict requirements regarding the materials used, the design, and the manufacture of the devices, ensuring that they are free of harmful substances and suitable for use in the workplace.

Certified balancers provide safety guarantees, reducing the risk of workplace accidents through thorough testing that verifies the product’s strength and reliability. It is essential that companies take these certifications into account when selecting spring balancers, in order to ensure not only optimal performance but also a safe work environment that complies with current regulations.

What is the difference between a spring balancer and an articulated arm?

At some workstations, the choice isn’t just between different balancer models, but between a spring-loaded balancer and an ergonomic articulated arm. Here are the main differences:

The choice between the two solutions depends on the specific context. For workstations where the operator moves freely around the workpiece, the spring-loaded balancer is almost always the best choice due to its minimal footprint. For fixed workstations where the clamping point is always the same, the articulated arm can offer greater precision. At SIRA S.p.A., we design both solutions through our Siratec division.

FAQ – Frequently Asked Questions About Spring Balancers

What is assembly process automation?

The automation of assembly processes involves the application of advanced technologies to optimize and streamline assembly operations on production lines. It involves the use of automated systems, robots, and mechanical devices to perform tasks traditionally carried out by human operators, such as screwing, drilling, and cutting.

This approach not only improves efficiency and productivity, but also helps ensure greater precision and repeatability in the manufacturing process. Implementing automation enables companies to respond quickly to market demands, reducing production times and improving the quality of the final product.

What Does Siratec Do?

Siratec was founded in response to SIRA S.p.A.’s need to go beyond product distribution and offer customers comprehensive solutions for industrial automation, designed with precise engineering specifications and manufactured using the best components available on the international market. It is the natural culmination of over 50 years of specialized experience in industrial fastening.

Siratec stands out for its engineering expertise in design and manufacturing: we do not simply sell components, but develop complete implementation plans in compliance with technical and functional standards, workstation ergonomics, safety regulations, and environmental standards.

Precision Assembly Tools and Technologies

Precision assembly equipment and technologies are fundamental components of industrial automation. This equipment, designed to ensure maximum efficiency and accuracy, includes advanced assembly machines that incorporate measurement sensors to continuously monitor critical parameters during the production process.

The use of state-of-the-art measurement technologies enables highly accurate results, minimizing errors and improving the final product quality. Furthermore, process automation allows for seamless interaction between the various system components, optimizing workflows and increasing overall production capacity.

In this context, Siratec’s engineering-based approach results in customized solutions that meet companies’ specific needs, ensuring tangible long-term results.

What automation technologies does Siratec work with?

Siratec’s solutions are primarily developed in three broad areas:

Automatic Screwdriving

This is the historic heart of Siratec. Screwdriving automation ranges from simple manual screwdrivers with screw feeders to fully automatic systems for transfer lines or robotic applications. The basic components— Estic ENRZ series motors, linear slides, clamping heads, and Nitto Seiko feeders—are all available in the Automation section, along with downloadable technical documentation.

Automatic Drilling and Tapping

Sugino Machine’s drilling and tapping units, featured in the dedicated section of the website, are integrated by Siratec into automated systems for transfer lines, stand-alone units, or combined systems. This is an area where Siratec’s engineering expertise is demonstrated through its ability to integrate diverse technologies into a coherent and reliable system.

Automatic cutting

The automatic cutting area uses Vessel pneumatic shears for industrial cutting and shearing applications in automated processes within the polymer resin and metal industries.

The Components of the Siratec Ecosystem

The SIRA S.p.A. automation catalog organizes components for automatic fastening into four product families, each with complete technical documentation available for download:

All technical documentation is available in the Automation section. This technical expertise makes SIRA S.p.A. the go-to partner for system integrators working in industrial automation.

Which industries benefit from Siratec’s assembly automation?

Competitive Advantages of Siratec Automation

There are automation component manufacturers and system integrators on the market. At SIRA S.p.A., through Siratec, we are both.

We have direct access to the best international components (Estic, Nitto Seiko, Sugino, Vessel) and the engineering expertise to integrate them into complete systems. This eliminates the typical challenges associated with multi-vendor projects:

• A single technical point of contact for the entire system: design, supply, installation, and maintenance
• Guaranteed compatibility between components: no risk of untested mechanical or electronic interfaces
• Technical Documentation
• Genuine replacement parts in stock: for all system components, available quickly
• Evolution over time: when the process changes, we can modify or expand the existing system

Contact Siratec for a consultation on automation

To request a personalized consultation on industrial automation, please contact our team of experts at Siratec. We are available to analyze the specific needs of your production line and propose customized solutions that optimize your assembly processes.

You can reach us through the Contact Us page on our website, where you’ll find a dedicated contact form and all the information you need to get in touch with us.

We are ready to assist you in transforming your manufacturing operations and implementing advanced technologies to improve the efficiency and quality of your products.

FAQ – Frequently Asked Questions About the Automation of Assembly Processes

At SIRA S.p.A., we distribute and provide technical support for world-leading brands of torque wrenches: Kanon, Crane Electronics, BMS, and SCS Cons.

What is a torque wrench?

A torque wrench is a tightening tool that allows you to apply a specific torque to a bolt or screw with controlled precision. Unlike a standard open-end or ratchet wrench, a torque wrench measures the applied torque—either mechanically or electronically—and alerts the operator when the target value has been reached.

The operating principle varies depending on the type: in mechanical wrenches, an internal mechanism (snap, flex, or pointer) detects the torque; in electronic and digital wrenches, a torque transducer converts the force into an electrical signal displayed on a screen, with the ability to record, store, and transfer data. It is precisely this distinction—mechanical versus digital—that defines the level of process traceability and, consequently, the instrument’s suitability for various certification contexts.

What are the different types of torque wrenches?

Click Torque Wrench

The most common type in the industry. When the set torque is reached, an internal mechanism produces an audible “click” and a slight tactile vibration, signaling the operator to stop tightening. The target torque is set using a graduated scale on the handle. Simple, sturdy, and reliable. Available in versions covering ranges from a few Nm up to over 1,000 Nm.

Click Torque Wrench

The simplest and most durable type: bending the clamping rod moves a pointer along a fixed graduated scale. No complex internal mechanisms; virtually indestructible. Limitation: It requires the operator to watch the scale while tightening, so it is less practical in confined spaces. Excellent for inspection and verification tasks.

Electronic torque wrench with display

Electronic wrenches, such as the BMS and Crane Electronics lines that we distribute, feature a torque transducer and a digital display that shows the applied torque value in real time. Key advantages: high precision (±1–2%), the ability to program target values with visual and audible alerts, and, in the most advanced models, a memory function that records completed tightening operations with data export capabilities.

Torque Wrench with Data Logging

Crane Electronics’ high-end torque wrenches allow you to record every tightening operation (torque value, angle, timestamp, and joint identifier, if applicable) and transfer the data to a quality management system via USB, Bluetooth, or Wi-Fi. They are essential for meeting the traceability requirements of IATF 16949 and AS9100 standards in the aerospace industry.

Digital click wrench with dual control

A particularly interesting hybrid category: the digital click wrench combines the classic click mechanism with an integrated electronic control system. The result is a tool that offers the familiar operation of a traditional click wrench while adding the precision of digital measurement (±1% from 20% to 100%) with data traceability. The SRC series from BMS, available from 20 to 160 Nm, is an example of this technology.

Applications and Use of the Torque Wrench

Torque wrenches are used in many sectors, including the automotive industry, the aerospace industry, and mechanical maintenance. This tool is essential for ensuring controlled tightening, as it allows for the application of a precise and repeatable torque, reducing the risk of damaging components or compromising the safety of assembled structures.

In the automotive industry, for example, it is used to install critical parts such as cylinder heads or wheels, where adhering to the specified torque is essential for the vehicle to function properly. Similarly, in the aerospace industry, the torque wrench is indispensable for ensuring the reliability of joints and structural connections.

What Features to Consider When Choosing a Torque Wrench

Relevant Standards for Torque Wrenches

Torque wrenches are measuring instruments: as such, they are subject to calibration and qualification regulations. The main references are:

• ISO 6789-1 and ISO 6789-2: international standards that define the design requirements and verification procedures for manual torque wrenches. Any wrench used in a certified process must comply with these standards and be recalibrated in accordance with them.
• ISO 9001:2015 requires the periodic calibration of measuring instruments used in production processes. Torque wrenches fall into this category.
• IATF 16949 (automotive): requires MSA (Measurement System Analysis) for process control tools, including torque wrenches at critical workstations.

Through SIRA Service, SIRA S.p.A. offers certified periodic calibration of torque wrenches, including the issuance of a calibration report and updates to the measuring instrument log. This service is essential for maintaining ISO 9001 compliance and industry certifications.

Kanon, Crane Electronics, and BMS: Our Leading Brands

Kanon – Japanese Quality Since 1938

Kanon is a Japanese manufacturer specializing in torque wrenches and measuring instruments for industrial use. Founded in 1938, it is one of the world’s leading brands for manufacturing precision, durability, and reliability. The product line includes ratchet wrenches, pointer wrenches, electronic wrenches, and torque multipliers, with ranges from 0.5 Nm up to several kNm. Distribution in Italy is handled exclusively by SIRA S.p.A.

Crane Electronics – Process Traceability

Crane Electronics is a British manufacturer specializing in electronic torque wrenches with advanced data-logging capabilities. The Traceability models are specifically designed for processes where every tightening operation must be documented: they feature high-precision transducers (±1%), a backlit digital display, internal memory for thousands of tightening operations, and a communication interface for data export. The ideal solution for automotive and aerospace production lines, as well as any process subject to quality audits.

To provide further insight into the criteria for managing measuring instruments in quality management systems, ACCREDIA—the Italian accreditation body —has published technical guidelines on the calibration of industrial measuring instruments, including those used to measure torque.

BMS – Advanced digital technology for every torque control need

BMS Ireland has been in the industry for about 40 years and is now one of the leading manufacturers of digital torque measurement systems, with a product line that covers automotive assembly, aerospace, and vehicle maintenance.

BMS is distinguished by its incorporation of innovative technologies into torque tools: bright OLED displays, angle transducers, a transducer-based control system for the mechanical trigger, and patented breakaway wrenches. All models come standard with PCFE software (Windows-compatible) and a USB cable, and feature trace, peak, and 99 configurable presets/jobs.

How to Navigate the Different Brands: Kanon, Crane Electronics, and BMS

With three leading brands in our portfolio, choosing the right tool depends on a combination of the application context, the required level of traceability, and the specific needs of the industry. The following table provides a quick guide.

Calibration and Maintenance: What You Shouldn’t Overlook

Regardless of the brand or type chosen, a torque wrench is a measuring instrument and, as such, must be calibrated periodically. The frequency depends on the intensity of use and the criticality of the process: as a general rule, for certified applications, at least one calibration per year or every 5,000 cycles is recommended (whichever comes first).

Trust SIRA S.p.A. for your custom torque wrench

When you choose SIRA S.p.A. for custom torque wrenches, you’re choosing an experienced and reliable partner in the field of measuring instruments. As a distributor of the leading brands Kanon and Crane Electronics, SIRA offers a complete range of torque wrenches that meet the highest standards of precision and traceability.

Thanks to dedicated technical support and certified calibration services, customers can ensure compliance with ISO and IATF standards, thereby guaranteeing the highest quality in their production processes. In addition, the wide variety of models available makes it possible to find the right wrench for every specific application, helping to improve operational efficiency and reduce the risk of errors during tightening.

FAQ – Frequently Asked Questions About Torque Wrenches

There is no single answer. It depends on factors such as the production process, quality requirements, the industry, and the available infrastructure.

At SIRA S.p.A., with over 50 years of experience in industrial fastening and a portfolio that includes the world’s leading manufacturers—such as Uryu, Panasonic, Kilews, and Kuken—we know how to address this question based on the customer’s needs.

How does a pneumatic screwdriver work?

The operating principle of an industrial pneumatic screwdriver—one of the most widely used tools in industry—is based on the conversion of compressed air energy into rotational motion. A vane or piston motor is powered by a centralized compressed air supply, typically at a pressure between 5 and 6 bar, and transmits torque to the output shaft via an internal mechanical mechanism.

The most common models include impact wrenches (or pneumatic guns) and hydraulic impact wrenches, such as those in the Uryu series, for which SIRA S.p.A. is the official and exclusive distributor in Italy. This latter technology is particularly valued in applications where high torque must be applied while minimizing the reaction force on the operator, all while ensuring greater precision than traditional impact wrenches.

Advantages of Pneumatic Screwdrivers

• High power-to-weight ratio: they deliver significant torque while remaining lightweight
• The initial purchase cost is generally lower than that of controlled-burn systems
• Durability and reliability in harsh industrial environments
• High clamping speed: ideal for high-volume lines with low criticality
• Wide selection of models for torque ranges from a few Nm up to several hundred Nm

Limitations of Pneumatic Screwdrivers

• Electronic torque control: The final value depends on air pressure and wear on the mechanism
• The Need for a Compressed Air System
• Energy consumption is generally higher than that of power tools
• More limited process monitoring and traceability
• Torque drift over time if the instrument is not maintained regularly

Professional Applications of Pneumatic Screwdrivers

Pneumatic screwdrivers are widely used in a variety of professional settings, including maintenance shops, auto body shops, and tire shops.

• In workshops, these tools are essential for assembly and repair work, where tightening speed and durability are critical.
• Tire shops use pneumatic wrenches to mount and remove tires, ensuring a quick and efficient process.
• In auto body shops, pneumatic wrenches are used to assemble car parts, where precision and reliability in tightening are crucial.

In addition, regular maintenance of screwdrivers is important to ensure optimal performance and extend the tool’s service life

How does an electronically controlled screwdriver work?

A controlled electronic screwdriver has a brushless electric motor that is balanced by an electronic unit that measures the applied torque in real time and, depending on the model, also the angle of rotation. These screwdrivers represent the natural evolution for all assembly processes in which the quality of the fastening must be documented, certified, or guaranteed within precise tolerances.

At the heart of these tools is the torque controller, which stops the tool or signals when the target value has been reached with an accuracy of up to ±3% or less. Brands such as Panasonic, Bosch, Estic, Kuken, and Kilews—all of which are part of our product portfolio—represent global excellence in this category.

Benefits of Electronically Controlled Screwdrivers

• Precise and repeatable torque control: essential for certified processes
• Complete traceability: Every fastening operation can be recorded, archived, and verified
• Compatibility with Industry 4.0 systems: data connectivity, OPC-UA, industrial protocols
• Reduction in scrap and rework: clamping is always within specifications
• Programming versatility: multiple clamping programs on a single tool
• Independence from the compressed air network: greater flexibility in setting up workstations

Limitations of electronic screwdrivers with control systems

• Higher purchase price compared to tires with the same torque rating
• Requires staff trained in programming and parameter management
• Slightly heavier in some models, especially those with a built-in controller
• Need for Periodic Maintenance on the Electronic System
• Reduced rotational speed

Head-to-Head Comparison: Tire vs. Electronic

When to Choose a pneumatic screwdriver

The pneumatic screwdriver remains the best choice in a well-defined set of situations. First and foremost, high-volume assembly lines where tightening requirements are low or moderate—such as in auto body shops, furniture manufacturing, white goods, and general components. In these cases, the operating speed and low operating cost per unit produced make the pneumatic screwdriver a competitive choice.

It is also the preferred solution in MRO maintenance shops, where technicians work on a wide variety of fasteners without having to certify each individual tightening.

To learn more about the selection of pneumatic tools in our catalog, visit the relevant section of our website.

When to Choose an controlled electronic screwdriver

A torque-controlled electronic screwdriver is a must—not just a recommendation—in all processes where fastening quality is critical and must be documented. This applies primarily to the automotive and aerospace sectors: the quality standards of major OEMs (Original Equipment Manufacturers) require that every critical fastening operation be tracked by torque and angle, and that the data be archived and available for audits.

The same applies to the aerospace and defense sectors, where assembly protocols are even more stringent and traceability is a regulatory requirement. But also in industrial electronics and security systems, any joint where unplanned loosening could cause malfunctions or hazards requires a certifiable electronic monitoring system.

Maintenance of an electric screwdriver and pneumatic screwdriver

Maintenance of electronic and pneumatic screwdrivers is crucial for ensuring optimal performance and extending the tools’ service life.

For pneumatic screwdrivers, it is essential to regularly check the compressed air supply system, ensuring that there are no leaks in the hoses and fittings. Cleaning the air filters and using specific lubricants help maintain operational efficiency.

As for electronic screwdrivers, maintenance involves periodically checking the electronic system, with particular attention to torque calibration and inspecting the batteries or power sources.

It is recommended that you install software updates when they become available to ensure that advanced features function properly. In either case, regular maintenance reduces the risk of sudden malfunctions and ensures safe and effective operation.

Choose SIRA S.p.A. when purchasing an power screwdriver or pneumatic screwdriver

At SIRA S.p.A., we don’t just supply the tool. When a customer contacts us to evaluate which technology to adopt, our technical team analyzes the specific process so we can recommend a tool tailored to their needs. Only after a careful analysis do we make a recommendation.

This approach as a technical partner is what has set SIRA S.p.A. apart for over 50 years. We serve more than 1,200 Italian and international customers, with a qualified in-house team and a stock of original products and parts that is always available.

FAQ – Frequently Asked Questions About electric screwdrivers or pneumatic screwdrivers

Reliability, power, and versatility are essential characteristics for tackling a wide range of industrial tasks. The AIR MARTIN line of professional pneumatic tools includes screwdrivers, drills, grinders, and sanders designed for manufacturing, assembly, and maintenance applications.

Thanks to their high power-to-weight ratio, ergonomic design, and low vibration levels, AIR MARTIN tools offer efficient and comfortable solutions even for intensive and continuous use.

• EXTENSIVE PORTFOLIO – A tool for every application.
  Screwdrivers, drills, grinders, and sanders: a complete line of tools for manufacturing, assembly, and maintenance.
• POWER AND PRECISION – Efficiency and control.
  High power-to-weight ratio, low vibration, and excellent ergonomics for precise and comfortable work.
• RELIABILITY – Consistent performance over time.
  Tools designed for intensive, continuous use, reducing maintenance and downtime.
• VERSATILITY – Solutions for every industry.
  From the automotive industry to metal fabrication, tools tailored to a variety of production and maintenance needs.

Torque control is essential for ensuring quality, reliability, and repeatability in industrial assembly processes. CRANE’s torque measurement and analysis solutions offer versatile tools for verifying the performance of screwdriving systems.

Thanks to its compatibility with rotary and static transducers, its various measurement modes, and its statistical process control capabilities, CRANE enables precise and systematic monitoring and analysis of tightening operations.

• COMPATIBILITY – A flexible solution.
  Compatible with Crane rotary and static transducers and WrenchStar Multi wrenches.
• TRACEABILITY – Quality under control.
  Statistical process control with Cm, Cmk, Cp, and Cpk metrics.
• ANALYSIS MODES – Customized control.
  Up to 9 measurement modes, including Peak, Pulse, Yield, and Re-tightening.
• ADDED VALUE – An integrated solution.
  Not just a kit, but a comprehensive solution for verifying and monitoring fastener tightness.

In industrial assembly processes, precision and traceability are becoming increasingly important requirements. The ESTIC Handy 2000 controlled tightening system offers advanced technologies to manage, monitor, and optimize every stage of the tightening process.

Thanks to its wide range of tightening strategies, intuitive interface, and connectivity and data analysis features, Handy 2000 enables improved process control and ensures high quality standards even in the most complex applications.

• CONTROL – Screwdriving Versatility
  Various control strategies, Pulse mode, and a wide range of tools for every application.
• SCREWDRIVING STRATEGIES – Intuitive interface
  : 7-inch touch panel, 250 channels, and 99 jobs for quick and easy management.
• OPERATIONAL EFFICIENCY – Advanced connectivity—
  , Fieldbus, integrated PLC, Ethernet, and USB—for easy integration and comprehensive data management.
• ADDED VALUE – Quality, traceability, and safety
  Real-time analysis, VIN traceability, up to 10 synchronized spindles, and compliance with EC directives.

The quality of an assembly also depends on torque control. KILEWS electric screwdrivers combine brushless technology, precision, and reliability to meet the demands of modern production processes.

With a wide range of tightening torques, from 0.1 to 25 Nm, and solutions designed for monitoring and control, KILEWS screwdrivers help improve the repeatability of operations, optimize efficiency, and reduce maintenance requirements.

• TECHNOLOGY – Brushless technology, industrial precision
  Electric screwdrivers designed to ensure reliable, consistent, and repeatable tightening.
• OPERATIONAL EFFICIENCY – More control, less maintenance.
  Adjustable torque, consistent performance, and brushless motors for longer operation at maximum efficiency.
• FIELDS OF APPLICATION – One product line, countless assembly possibilities.
  From microelectronics to heavy-duty industrial applications, all the way to automated processes.
• ADDED VALUE – Every fastening becomes a measure of quality.
  Dedicated controllers, monitoring, and integration for safer production.