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Page Title: APPENDIX H TORQUE LIMITS
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TM 10-4320-348-14 APPENDIX H TORQUE LIMITS NOTE To determine breakaway torque, thread nut onto screw or bolt until at least two threads stick out. Nut shall not make contact with a mating part.  Stop the nut.  Torque necessary to begin turning nut  again  is  the  breakaway  torque.    Do  not  reuse  self-locking  nuts  that  do  not  meet  minimum breakaway torque. Usage Much Used Much Used Used at Times Used at Times To 1/2-69,000 To 3/4-120,000 To 5/8-140,000 150,000 Capscrew diameter and (4850.7000) (8436.0000) (9842.0000) (10545.0000) minimum tensile strength To 3/4-64,000 To 1-115,000 To 3/4-133,000 psi (kg/cm2) (4499.2000) (8084.5000) (9349.9000) To 1-55,000 (3866.5000) Minimum Medium Best Quality of Material Indeterminate Commercial Commercial Commercial SAE Grade Number 1 or 2 5 6 or 7 8 Capscrew Body Size Torque Torque Torque Torque inches (thread) ft-lb (m-kg) ft-lb (m-kg) ft-lb (m-kg) ft-lb (m-kg) 1/4-20 5 (0.6915) 8 (1.1064) 10 (1.3830) 12 (1.6596) -28 6 (0.8293) 10 (1.3830) 14 (1.9362) 5/16-18 11 (1.5213) 17 (2.3511) 19 (2.6277) 24 (3.3192) -24 13 (1.7979) 19 (2.6277) 27 (3.7341) 3/8-16 18 (2.4894) 31 (4.2873) 34 (4.7022) 44 (6.0852) -24 20 (2.7660) 35 (4.8405) 49 (6.7767) 7/16-14 28 (3.8132) 49 (6.7767) 55 (7.6065) 70 (9.6810) -20 30 (4.1490) 55 (7.6065) 78 (10.7874) 1/2-13 39 (5.3937) 75 (10.3725) 85 (11.7566) 105 (14.5215) -20 41 (5.6703) 85 (11.7555) 120 (16.5960) H-1

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