Features of TOHNICHI Torque Wrench① High Accuracy
Our click type torque wrenches mostly maintain the accuracy of ±3％ . This accuracy rate exceeds ISO6789 standard. Also the digital torquewrench CEM3 series for inspection/measurement record ±1％ of accuracy. Since the measuring range of dial type torque wrenches DB series
is wider than ISO6789 Type I Class B, we calibrate our DB series by adding one more minimum torque point, which is less than 20%, to theother 4 points. Only the equipments that pass this strict test are shipped with calibration certiﬁcate. (Refer to technical data P.92-95)② High Durability
Tohnichi guarantees accuracy and durability for the product within a hundred thousand cycles in use or one year use at themaximum torque value. Tohnichi click type torque wrench such as QL series is able to use up to around a million cycles(500,000 cycles for 550-1000N・m size, 250,000 cycles for over 1000N・m size click type torque wrench) if the tool is periodically calibrated and taken the necessary repairing every a hundred thousand cycles use (refer to technical data P.92).

Analyzing sq. drive with theformer technology

Analyzing sq. drive with the highdurability & smaller size sq. drivetechnologies

Small sq. drive with high durability

Durability test to ensurehigh durability

Applying various technologies such as FME (Finite Element Method), Tohnichi has succeeded

Tohnichi conducts durability testing when developing

to develop the smaller size square drive, interchangeable head, and torque wrench (appliednew products. Before manufacturing new products,

to QL25N5-1/4, QL100N4-3/8, QL280N-1/2 and interchangeable heads QH series). Thiswe test durability as type certiﬁcation test also whenenables our torque wrench to use with the smaller size socket, so that eventually devotes tomass production, we conduct sampling test regularly

decrease the total weight of the tool, and leads to increase users workability.

to maintain our high level of durability.

③Guaranteed supply system
Torque wrenches for manufacturing are often registered with their speciﬁcations; therefore stable supply system in a long run
is required. We do not only strive for maintaining a long-term and stable supply of our products, but also oﬀer repair parts
including tools for discontinued products with a limit of 6 years. Also we strengthen our agency network in overseas, supplying products and calibration/repair services for the customers around the world.

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TOHNICHI TORQUE HANDBOOK Vol.8

Torque Wrench

Tohnichi 4 types of torque wrenches for your ideal work
Characteristic of Signal Type Torque Wrench

and feeling , stop to apply force and ﬁnish tightening to avoid over-torque.
A sample product of click type torque wrenchfor Assemblycompletion upon reaching the set torque. Once recognizing the clicking sound

Torque Wrench

Set torqueDirect Reading

The most standard torque wrench. A clear click sound signals tighteningclickTorque Wrench

Torque■Click Type Torque Wrench

QL [P.194]
Tightening angle

Torque■Two Step Click Type Torque Wrench
The primary click sound signals reaching the 1s t set torque and thePrimary Click
1st Set Torque(set torque)nd2 Set Torquesecondary click signals tightening completion. Tightening after the 2nd click
causes over-torque. Compared with the click type, Two-Step Click Typeleaves wider margin after clicking and is more eﬀective against over-torque.

Secondary Click

A sample product of two step click type torque wrench
YCL2 [P.224]

Tightening angle

Torque■Slip Type Torque Wrench
The head starts slipping upon reaching the set torque. The torque isSet torquealmost stable until the head slips about 90 degrees angle. Tightening
after that causes over-torque. Head slipping and bending alert users toSlip

stop pulling.
A sample product of slip type torque wrenches
NSP [P.256]
Tightening angle■Rotary Slip Type Torque Wrench
TorqueCam-link mechanism generates a 45 degree slip and 'click' feeling upon reaching the setSet torquetorque. Slip and click are repeatedly felt if tightening after reaching the set torque continues.
Because users can tighten no further than the set torque, over-torque is completely prevented.
A sample product of air-slip type torque wrenches
QSPCA [P.234]

Tightening angle

Features of TOHNICHI Torque Wrench

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