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The testing evaluation of several digital torque wrenches by using a torque wrench tester

Koji Ogushi

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Abstract

Hand torque wrenches (HTWs) with electrical indicating devices (Type I, Class B defined in ISO 6789-1:2017; called “digital torque wrenches”) manufactured by several manufacturers were tested and evaluated. The digital torque wrench is the most accurate in all types of HTWs in general. The reference standard was a torque wrench tester (TWT) with a rated capacity of 50 N · m. This TWT has been calibrated by using a traceable reference torque wrench (RTW). Testing results are described with some characteristics.

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What this paper is about

Hand torque wrenches (HTWs) with electrical indicating devices (Type I, Class B defined in ISO 6789-1:2017; called “digital torque wrenches”) manufactured by several manufacturers were tested and evaluated. The digital torque wrench is the most accurate in all types of HTWs in general. The reference standard was a torque wrench tester (TWT) with a rated capacity of 50 N · m. This TWT has been calibrated by using a traceable reference torque wrench (RTW). Testing results are described with some characteristics.

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Available abstract

Hand torque wrenches (HTWs) with electrical indicating devices (Type I, Class B defined in ISO 6789-1:2017; called “digital torque wrenches”) manufactured by several manufacturers were tested and evaluated. The digital torque wrench is the most accurate in all types of HTWs in general. The reference standard was a torque wrench tester (TWT) with a rated capacity of 50 N · m. This TWT has been calibrated by using a traceable reference torque wrench (RTW). Testing results are described with some characteristics.

Key concepts: Wrench, Torque, Engineering, Mechanical engineering, Physics, Thermodynamics

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