TP-6356 4/12216 Appendix
Appendix C General Torque Specifications
American Standard Fasteners Torque Specifications
Size
Torque
Measurement
Assembled into Cast Iron or Steel
Assembled into
Aluminum
Grade2or5
Grade 2 Grade 5 Grade 8
8-32 Nm (in. lb.) 1.8 (16) 2.3 (20) —
SeeNote3
10-24 Nm (in. lb.) 2.9 (26) 3.6 (32) —
10-32 Nm (in. lb.) 2.9 (26) 3.6 (32) —
1/4-20 Nm (in. lb.) 6.8 (60) 10.8 (96) 14.9 (132)
1/4-28 Nm (in. lb.) 8.1 (72) 12.2 (108) 16.3 (144)
5/16-18 Nm (in. lb.) 13.6 (120) 21.7 (192) 29.8 (264)
5/16-24 Nm (in. lb.) 14.9 (132) 23.1 (204) 32.5 (288)
3/8-16 Nm (ft. lb.) 24 (18) 38 (28) 53 (39)
3/8-24 Nm (ft. lb.) 27 (20) 42 (31) 60 (44)
7/16-14 Nm (ft. lb.) 39 (29) 60 (44) 85 (63)
7/16-20 Nm (ft. lb.) 43 (32) 68 (50) 95 (70)
1/2-13 Nm (ft. lb.) 60 (44) 92 (68) 130 (96)
1/2-20 Nm (ft. lb.) 66 (49) 103 (76) 146 (108)
9/16-12 Nm (ft. lb.) 81 (60) 133 (98) 187 (138)
9/16-18 Nm (ft. lb.) 91 (67) 148 (109) 209 (154)
5/8-11 Nm (ft. lb.) 113 (83) 183 (135) 259 (191)
5/8-18 Nm (ft. lb.) 128 (94) 208 (153) 293 (216)
3/4-10 Nm (ft. lb.) 199 (147) 325 (240) 458 (338)
3/4-16 Nm (ft. lb.) 222 (164) 363 (268) 513 (378)
1-8 Nm (ft. lb.) 259 (191) 721 (532) 1109 (818)
1-12 Nm (ft. lb.) 283 (209) 789 (582) 1214 (895)
Metric Fasteners Torque Specifications, Measured in Nm (ft. lb.)
Size (mm)
Assembled into Cast Iron or Steel
Assembled into
Aluminum
Grade 5.8 or 8.8
Grade 5.8 Grade 8.8 G rade 10.9
M6 x 1.00 6.2 (4.6) 9.5 (7) 13.6 (10)
SeeNote3
M8 x 1.25 15 (11) 23 (17) 33 (24)
M8 x 1.00 16 (11) 24 (18) 34 (25)
M10 x 1.50 30 (22) 45 (34) 65 (48)
M10 x 1.25 31 (23) 47 (35) 68 (50)
M12 x 1.75 53 (39) 80 (59) 115 (85)
M12 x 1.50 56 (41) 85 (63) 122 (90)
M14 x 2.00 83 (61) 126 (93) 180 (133)
M14 x 1.50 87 (64) 133 (98) 190 (140)
M16 x 2.00 127 (94) 194 (143) 278 (205)
M16 x 1.50 132 (97) 201 (148) 287 (212)
M18 x 2.50 179 (132) 273 (201) 390 (288)
M18 x 1.50 189 (140) 289 (213) 413 (305)
M20 x 2.50 245 (181) 374 (276) 535 (395)
M20 x 1.50 264 (195) 402 (297) 576 (425)
M22 x 2.50 332 (245) 507 (374) 725 (535)
M22 x 1.50 351 (259) 535 (395) 766 (565)
M24 x 3.00 425 (314) 649 (479) 928 (685)
M24 x 2.00 447 (330) 682 (503) 976 (720)
M27 x 3.00 — 937 (692) 1341 (990)
M27 x 2.00 — 985 (727) 1409 (1040)
M30 x 3.50 — 1278 (943) 1829 (1350)
M30 x 2.00 — 1349 (996) 1931 (1425)
Notes:
1. The torque values above are general guidelines. Always use the torque values specified in the service manuals and/or assembly
drawings when they differ from the above torque values.
2. The torque values above are based on new plated threads. Increase torque values by 15% if non-plated threads are used.
3. Hardware threaded into aluminum must have either two diameters of thread engagement or a 30% or more reduction in the torque to
prevent stripped threads.
4. Torque values are calculated as equivalent stress loading on American hardware with an approximate preload of 90% of the yield strength
and a friction coefficient of 0.125.
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