ASTEC 40 Series - Appendix B: Prevailing Torque Locknut; UNC Bolt Torque Chart

IB-2003 Series 40 Transfl ite - Stationary Conveyor
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Appendix B: Prevailing Torque Locknut
Nominal Size
bolt/nut
Standard Hex
Ft.-lb. (N-M)
Prevailing Torque
Ft.-lb. (N-M)
Standard Hex
Ft.-lb. (N-M)
Prevailing Torque
Ft.-lb. (N-M)
1/4 - 28 7 (10) 6 (8) 10 (14) 8 (11)
5/16-24 14 (20) 12 (16) 20 (28) 16 (22)
3/8-24 26 (35) 21 (28) 37 (50) 30 (40)
7/16-20 41 (56) 33 (45) 58 (79) 47 (63)
1/2 - 20 63 (86) 51 (69) 90 (122) 72 (97)
9/16 - 18 91 (123) 72 (98) 128 (174) 102 (139)
5/8-18 127 (172) 102 (138) 179 (243) 143 (195)
3/4-16 222 (301) 178 (241) 314 (425) 251 (340)
7/8-14 354 (480) 283 (384) 500 (678) 400 (542)
1 - 12 526 (713) 421 (571) 743 (1008) 595 (806)
1-1/8- 12 673 (912) 538 (729) 1079 (1463) 864 (1171)
1-1/4 - 12 937 (1270) 750 (1016) 1504 (2039) 1203 (1631)
1-3/8 - 12 1263 (1712) 1010 (1370) 2027 (2748) 1622 (2198)
1-1/2 - 12 1657 (2246) 1325 (1797) 2659 (3605) 2127 (2884)
Bolt Torque Chart - UNF
Grade 5
Grade 8
Diameter
(mm)
Standard Hex
(N-M)
Prevailing Torque
(N-M)
Standard Hex
(N-M)
Prevailing Torque
(N-M)
578810
6 11151318
7 19252229
8 27363243
10 54 72 63 84
12 94 125 110 147
14 150 200 175 234
16 235 313 274 365
18 323 430 377 503
20 458 610 535 713
22 622 830 727 970
24 791 1055 925 1233
27 1157 1543 1352 1803
30 1572 2095 1837 2450
33
2138 2851 2500 3332
36
2746 3662 3210 4279
Metric Bolt Torque Chart
Class 10.9 Class 12.9