TM 10-4320-303-13 APPENDIX G TORQUE LIMITS SAE Grade Number 1 or 2 5 6 or 7 8 Quality of Material Capscrew Head Markings Indeterminate Minimum Commercial Medium Commercial Best Commercial NOTE Head marking may vary with different manufacturers. Capscrew Body Size Torque Torque Torque Torque (Inches)-(Thread) Ft Lb (Nm) Ft Lb (Nm) Ft Lb (Nm) Ft Lb (Nm) 1/4 20 5 (7) 8 (11) 10 (14) 12 (16) 28 6 (8) 10 (14) 14 (19) 5/16 18 11 (15) 17 (23) 19 (26) 24 (33) 24 13 (18) 19 (26) 27 (37) 3/8 16 18 (24) 31 (42) 34 (46) 44 (60) 24 20 (27) 35 (47) 49 (66) 7/16 14 28 (38) 49 (66) 55 (75) 70 (95) 20 30 (41) 55 (75) 78 (106) 1/2 13 39 (53) 75 (102) 85 (115) 105 (142) 20 40 (56) 85 (115) 120 (163) 9/16 12 51 (69) 110 (149) 120 (163) 155 (210) 18 55 (75) 120 (163) 170 (231) 5/8 11 83 (113) 150 (203) 167 (226) 210 (285) 18 95 (129) 170 (231) 240 (325) 3/4 10 105 (142) 270 (366) 280 (380) 375 (508) 16 115 (156) 295 (400) 420 (569) 7/8 9 160 (217) 395 (536) 440 (597) 605 (820) 14 175 (237) 435 (590) 675 (915) 1 8 235 (319) 590 (800) 660 (895) 910) (1234 14 250 (339) 660 (895) 990 (1342) CAUTION If replacement capscrews are of a higher grade than originally supplied, use torque specifications for that placement.  This will prevent equipment damage due to over torquing. NOTE Always  use  the  torque  values  listed  above  when  specific  torque  values  are  not available. G-1/(G-2 Blank)