102 Appendix TP-6844 1/13
Appendix C General Torque Specifications
American Standard Fasteners Torque Specifications
Size
Torque
Measurement
Assembled into Cast Iron or Steel Assembled into
Aluminum
Grade 2 or 5 Grade 2 Grade 5 Grade 8
8-32 Nm (in. lb.) 1.8 (16) 2.3 (20) —
See Note 3
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.) 24.0 (18) 38.0 (28) 53.0 (39)
3/8-24 Nm (ft. lb.) 27.0 (20) 42.0 (31) 60.0 (44)
7/16-14 Nm (ft. lb.) 39.0 (29) 60.0 (44) 85.0 (63)
7/16-20 Nm (ft. lb.) 43.0 (32) 68.0 (50) 95.0 (70)
1/2-13 Nm (ft. lb.) 60.0 (44) 92.0 (68) 130.0 (96)
1/2-20 Nm (ft. lb.) 66.0 (49) 103.0 (76) 146.0 (108)
9/16-12 Nm (ft. lb.) 81.0 (60) 133.0 (98) 187.0 (138)
9/16-18 Nm (ft. lb.) 91.0 (67) 148.0 (109) 209.0 (154)
5/8-11 Nm (ft. lb.) 113.0 (83) 183.0 (135) 259.0 (191)
5/8-18 Nm (ft. lb.) 128.0 (94) 208.0 (153) 293.0 (216)
3/4-10 Nm (ft. lb.) 199.0 (147) 325.0 (240) 458.0 (338)
3/4-16 Nm (ft. lb.) 222.0 (164) 363.0 (268) 513.0 (378)
1-8 Nm (ft. lb.) 259.0 (191) 721.0 (532) 1109.0 (818)
1-12 Nm (ft. lb.) 283.0 (209) 789.0 (582) 1214.0 (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 8.8Grade 5.8 Grade 8.8 Grade 10.9
M6 x 1.00 6.2 (4.6) 9.5 (7) 13.6 (10)
See Note 3
M8 x 1.25
15.0 (11) 23.0 (17) 33.0 (24)
M8 x 1.00
16.0 (11) 24.0 (18) 34.0 (25)
M10 x 1.50
30.0 (22) 45.0 (34) 65.0 (48)
M10 x 1.25
31.0 (23) 47.0 (35) 68.0 (50)
M12 x 1.75
53.0 (39) 80.0 (59) 115.0 (85)
M12 x 1.50
56.0 (41) 85.0 (63) 122.0 (90)
M14 x 2.00
83.0 (61) 126.0 (93) 180.0 (133)
M14 x 1.50
87.0 (64) 133.0 (98) 190.0 (140)
M16 x 2.00
127.0 (94) 194.0 (143) 278.0 (205)
M16 x 1.50
132.0 (97) 201.0 (148) 287.0 (212)
M18 x 2.50
179.0 (132) 273.0 (201) 390.0 (288)
M18 x 1.50 189.0 (140) 289.0 (213) 413.0 (305)
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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