ASME B107.300:2021 pdf download

ASME B107.300:2021 pdf download.Hand Torque Tools and Torque Testers
1 SCOPE
This Standard provides performance and safety re- quirements for manually operated torque instruments, commonly used for measurement of torque to control the tightness of threaded fasteners. It also provides performance and safety requirements for manually oper- ated electronic torque instruments with integral or inter- changeable heads. It includes requirements for endurance, torque value ranges, angle measurements, and accuracy for these torque instruments. It further provides performance and safety requirements for elec- tronictorquetestersusedforcheckingmanuallyoperated, hand-held torque wrenches and torque screwdrivers. Itis notintended to describe products infrequentlyutilized or those designed for special purposes. This Standard may be used as a guide by state autho- rities orotherregulatorybodies intheformulationoflaws or regulations. It is also intended for voluntary use by establishments that use or manufacture the instruments covered.
2 DEFINITIONS
accuracy: the permissible deviation, tolerance, or error band. A higher value means a lower certainty of correct- ness. angle: the amount ofaxial rotational displacement from a start point to an end point. break-over: a temporary reduction in torque indicating a target value has been achieved, indicated by a displace- ment of the handle of at least 10 deg. click: a temporary reduction in torque indicating a target value has been achieved, indicated by a displacement of the handle of less than 5 deg. first peak: the maximum torque value just prior to the torque drop-off, which on Category 14, Types II and IV torque wrenches occurs as the wrench begins its momen- tary reduction in torque. flex-head: see flexible ratchet head. flexible ratchethead: a handle with the capability ofoper- ating at an angle other than perpendicular to the axis of rotation. full scale: see rated capacity. graduation: a mark on the instrument indicating a torque value.handtorqueinstrument: a tool combininghand wrenching and torque measurement functions, formerly referred to as hand torque wrench. increment: the value of the difference between adjacent graduations. indicated value: for Category 14, Type I, the value the instrument displays when torque is applied; for Types II, III, and IV, the value to which the instrument is set or preset. measuredvalue: the actual torque determined bya torque tester. operating load: the operating load shall be calculated by dividing the rated capacity by the distance between the axis of the torque moment and the center of the grip or designated load point. peak: the maximum torque value reached during the process of applying the load to the wrench. pivot:ashortrodorshaftonwhicharelatedpartrotatesor swings. rated capacity: the maximum intended torque the user shall measure or apply. resolution: the smallest distinguishable change in displayed value. scale: the representation of the range of the instrument, divided into increments marked by numbered and unnumbered graduations. setting:theamountoftorquetheinstrumentisexpectedto apply. torque-to-angle: a method ofassembly where a threshold torque is applied and then more torque is applied to produce a specific angle. track: continuous readout of torque applied at any moment. usable range ofthe transducer: the range to which the accuracy requirements of para. 5.9 are applied.
5 PERFORMANCE REQUIREMENTS
Figures are descriptive and notrestrictive. Theyare not intendedtoprecludethemanufactureorpurchaseofother forms oftorque instruments conforming to this Standard. Torque instruments shall pass all applicable tests in section 6. Unless otherwise specified, torque instruments shall be calibrated in the direction(s) of intended use. Torque instruments shall be capable ofbeingcalibrated to the specified accuracy by a method traceable to the National Institute of Standards and Technology (NIST).