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are inherently hazardous and adequate safeguards for personnel and property shall be employed in conducting these tests. 5.1 Hardness Hardness shall be tested in accordance with ASTM E 18. When surface preparation is necessary, the amount of material removed shall not exceed 0.007 in. (0.18 mm) in the area contaced by the indenter. 5.2 Proof Torque Test 5.2.1 Mandrels for Wrench Openings.
The wrenches shall be tested on mandrels conforming to Table 8 or Table 8M as applicable. Mandrels shall be hardened to a minimum of 55 HRC and smoothly finished on the wrench engaging surfaces. 5.2.2 Application of Proof Torque. Wrench openings shall be gaged prior to testing. The torque shall be applied with a suitable torque producing machine to mandrels that are fully seated and extend through the wrenching surfaces. Above asme bavc pdf 50% of peak value, torque shall be applied at a speed of 15 deg/min to 30 deg/ min until peak value is verified, then torque shall be released. Following the removal of the proof torque, wrench openings will be regaged. Wrenches that do not sustain the proof torque or crack, fracture, or slip on the mandrel, have failed the test. The wrench shall also be considered to have failed the test if there is permanent spreading of the open end jaw in excess of the "NO GO" gage sizes of ASME B107.17M by more than the following at the tips: ASME B107.100-2010 (B107.21)
