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1. Torque

Explains what torque is, the difference between weight and mass, units of measurement, and conversion methods.

2. Bolt Tightening

Summarizes different tightening methods, and explains the relationship between bolts and torque, torque coefficient, how to determine tightening torque, tightening torque tolerance, and axial tension stability (tightening procedure).

3. Inspecting the Tightening Torque

Summarizes how to inspect tightening torque, and explains retightening torque methods, Tohnichi's own new retightening method (the T-point method).

4. Tightening Reliability

Explains the characteristics of tightening failures, factors causing such failures, bolt tightening reliability, machine errors, human errors, tightening reliability and bolts (Fcon), establishment of a bolt tightening reliability system, and tightening assurance systems.

5. Selection of Tightening Tools

Explains general model selection flow charts, procedure for selecting manual torque devices, how to select by purpose, how to select from torque capacity, procedure for selecting manual torque equipment, materials for selecting from tightening time, and tightening tool selection criteria.

6. Torque Tools are Measurement Equipment

Provides information related to ISO standards for measurement control, how torque devices are measuring equipment, traceability, JCSS-relevant information detailing the relationship between ISO17025 and an MRAs, JCSS calibration services, accuracy and uncertainty, durability accuracy for Tohnichi's torque equipment, the purpose of daily checks and periodic calibrations and the selection of testing machines, and a comparison of Tohnichi, JIS and ISO standards.

7. Maintenance for Torque Tools

Explains daily checks, torque equipment adjustment methods, and how to replace parts, and gives examples of parts lists and cross-sectional drawings.

8. Screws

Explains dimensions of ISO bolts and non-ISO bolts, washer dimensions, bolt hole diameters, countersunk hole diameters, prepared hole diameters, and bolt loosening and how to prevent it.

9. Standards and Limitations

Explains pertinent parts of Japan’s Foreign Exchange and Foreign Trade Law, JIS and ISO standards governing torque control and bolts, wireless standards outside Japan, and CE marking, and summarizes RoHS, REACH, GOST-R, and CCC.

[September 2024 Version] Everything from torque controls to Tohnichi’s Tightening Guarantee System

[September 2024 Version] Tohnichi’s Tightening Guarantee System and combinations with other systems make it possible to deal globally with difficult issues that ordinarily could not be resolved with a single product at a level that satisfies the quality and cost requirements of customers. The PDF files contain links to products on the company website, making it easy to obtain detailed information.

Torque Wrench Management and Loss Fees

If periodic torque wrench calibrations are done only once a year with a torque wrench tester, the accuracy of those wrenches will be unknown until the next calibration, 12 months later. If the accuracy is then found to exceed the control limit, you won’t know when the problem first occurred, and the products you’ve already delivered may have quality issues. This risk can be minimized through the use of an LC3/LC3-G Digital Torque Wrench Checker for daily checks. The result could be lower costs in the long run. This discussion paper identifies appropriate checking intervals and adjustment limits, taking into account factors such as loss fees, some common lengths of time between checks, cost and accuracy. Thus, it compares loss under a company’s current circumstances with loss under appropriate conditions.

Initiatives for ISO 6789:2017

The ISO 6789 international standards for hand torque tools were revised significantly in 2017, leading to predictions that torque tool manufacturers will need to comply with the new standards in the future. As a Japanese torque tool maker, Tohnichi Manufacturing will also be engaging in initiatives in this regard. ◆ The Calibration Certificates will be different. ◆ Torque ranges and models will change for some products. For more information, please download and confirm.

Features of TOHNICHI Torque Driver

Uses illustrations to explain the special features of Tohnichi torque screwdrivers.

How to set torque on adjustable and preset torque screwdrivers

Explains how to set torque on adjustable torque screwdrivers with torque scale for easy tightening torque settings, and on preset torque screwdrivers without torque scale for repeated tightening at the same torque.

How to preload, how to set a memory pointer

Explains the preload function on FTD series direct reading torque screwdrivers, and how to set the FTD-S indicator and memory pointer to zero.

Features of TOHNICHI Torque Wrench

Uses illustrations to explain special features of Tohnichi torque wrenches.

Special Torque Wrench

Gives examples of made-to-order torque wrenches and explains how to order them.

How to set torque

Uses illustrations to explain how to set torque for adjustable, pre-lock, and preset torque wrenches.

Applying the correct force/Loosening tasks/Tightening left-handed bolts and screws

When using a torque wrench, it explains important methods for applying force, how to perform loosening, and how to tighten a counterclockwise tightening screw. It also explains loosening operations and how to tighten counterclockwise bolts and screws.

Piping/Air pressure and operating range

Discusses guidelines for essential air piping, and explains air pressure factors to consider when using Tohnichi pneumatic tools.

Calculating the compressor capacity.

Explains how to calculate compressor capacity.

Setting torque and tightening operations using power tools

Explains how to adjust torque on power torque tools, and gives tightening examples.

Trouble shooting for pneumatic tools

Explains trouble shooting for pneumatic tools, what to look for, and how to resolve issues.

Things to look out for when handling multi-spindle equipment, and mounting dimensions

Discusses guidelines for handling multi-spindle equipment, and explains minimum center distance between the spindles for manufacturing automatic equipment.

Multi-Spindle Fully-Automatic Airtork Patented System

Demonstrating an example of a multi-spindle tightening system, presents a torque/angle monitoring system with tightening assurance and work conveyance mechanisms, and a monitoring system with multi-spindle tightening feature that controls tightening torque data.

Tool Management System

Explains a labor-saving torque tool calibration system for torque wrenches, torque screwdrivers, etc.

Torque Wrench Tester/Digital Torque Wrench with JCSS-Compliant Calibration Certificate

Information on purchasing digital torque wrench testers with a JCSS calibration certificate or an uncertainty in calibration certificate, and on digital torque wrenches with a JCSS calibration certificate.

Torque Measuring System

Demonstrating an example of a torque measuring system, explains the thread tightening testing machine BTT1220 and a final drive preload automatic adjustment machine.

[September 2024 Version] Tohnichi’s Torque Engineering Seminars, ready to provide positive results in the workplace right away.

[September 2024 Version] This catalog features information on Tohnichi’s Torque Engineering Seminars, which provide positive results in the workplace right away. The skill sets and occupations of some of those who recently took the seminars (April 2022–March 2023) are also listed. The catalog also presents recent photos of the seminars and gives easy-to-understand information on the courses offered. Seminar descriptions indicate recommended paths for different types of workers. Responding to popular demand, we are also holding regular repair and calibration courses for our QL5 series of compact adjustable torque wrenches, which pair large torque scales with small bodies. The catalog includes the seminar schedules through to the end of May 2025, as well as application forms.

Differences between adjustable, preset and pre-lock torque wrenches

Explains the differences between adjustable, preset and pre-lock torque wrenches, and describes their special features. Using them taking differences and features into account cannot only improve work efficiency but also result in higher quality and cost reduction. Typical model names in the PDF have a link to the relevant product details.

Tohnichi torque product information: Automobile maintenance

This catalog gathers together all of the Tohnichi torque wrenches and other tools often used in the automobile (passenger, large vehicle) maintenance industry. The catalog features the TW2 series / DQLE2 series that are popular for wheel nuts used on large vehicles, the QL / QLE2 series used in the repair and maintenance of automobiles, etc., the DWQL series for turn-of-nut method tightening, the CL / CLE2 series of interchangeable heads, whose world-leading selection of interchangeable heads improve work efficiency, the DB / DBE series and SF / F series for use in tightening torque inspections, and the "Linechecker (R) LC3 series" of digital torque wrench checkers perfect for daily check of torque wrenches.

Tohnichi torque product information: Plant construction

The catalog includes a wide selection of Tohnichi’s torque wrenches and devices often used for factory construction and maintenance, and in the construction industry. Listings include the AP2 series pneumatic torque wrench for fully automatic large bolt tightening, the DAP2-R series electric torque wrench with built-in torque sensor, DECA2/DECA series torque attachments for increasing the tightening torque of small torque wrenches by 10 times, the QLE2/CLE2/PHLE2 series large torque wrench for tightening tasks, the DBE/DBR series dial indicator torque wrench for inspections, the CEM3-BT series digital torque wrench that transmits tightening torque data wirelessly via Bluetooth®, the TDMS/TDMSHT series Tightening Data Management System, the BTM series hydraulic tension meter, and the TT2000 series Ultrasonic Tightening Tester.

Tohnichi torque product information: Low torque tighteners for small screws, etc.

This catalog gathers together all of the Tohnichi torque screwdrivers and torque gauges used in the tightening of machine screws for home appliances and panel boards, and in the tightening and torque inspections of miniature screws of M1 size. The catalog includes RTD/LTD idling preset torque screwdrivers, AMRD/AMLD used for tightening miniature screws, FTD2-S/FTD dial torque screwdrivers, the STC2 digital torque screwdriver, RTDZ/RNTDZ grounded torque screwdrivers, the MNTD marking torque screwdriver and ATGE/BTGE digital torque gauges for preventing human tightening errors (pokayoke), and the TDT3 digital torque screwdriver used for calibrating.

Tohnichi torque product information: Railroad

This catalog gathers together all of the Tohnichi torque wrenches and other tools often used in the railroad industry for the assembly and maintenance of rail cars. It features information and prices for the FD series that wirelessly transmits tightening torque data as tightening work is done, the FDD series that can detect double tightening, the MPQL / MQL & MQSP series of marking torque wrenches for hexagonal bolts and the CMQSP series for hexagon socket bolts that leave evidence of regulation torque, the long-awaited MCSP series of marking torque wrenches for nuts, the DB / DBE series of torque wrenches for inspections, the T-S series for rails, the CEM3-BT series of digital torque wrenches with Bluetooth, and the TDMS / TDMSHT series of data control systems.

Tohnichi Torque Devices for Aviation Industries

This catalog and price list present a wide selection of torque wrenches, torque screwdrivers and other instruments that conform to the Imperial (American) system of measurement, which is often used in aerospace industries. Japan’s Measurement Law requires that SI (metric) units be used in Japan, but allows for some exceptions permitting the use of the Imperial system, including the manufacture of aircraft. Japan’s Ministry of Economy, Trade and Industry has given Tohnichi blanket approval to use the Imperial system for more than 600 types of products. This permits us to provide them to customers in large numbers without complicated red tape. For further information, please see the catalog.

Interchangeable Head Series for Tohnichi Interchangeable Head Torque Wrenches

The world’s largest selection of torque products. Tohnichi’s standard inventory of more than 300 product types helps reduce workload for manufacturers of specialty items. Inventory lets you choose optimum interchangeable heads to boost work efficiency. A selection of Imperial unit SH open end heads and RH ring heads is also available.