TP-6391 9/0882 Appendix
Appendix C General Torque Specifications
American Standard Fasteners Torque Specifications
Assembled into Cast Iron or Steel
Assembled into
Size
orque
Measurement
Grade 2 Grade 5 Grade 8
um
num
Grade2or5
8-32 Nm (in. lb.) 1.8 (16) 2.3 (20) —
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) SeeNote3
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.)
Assembled into Cast Iron or Steel
Assembled into
Size (mm)
Grade 5.8 Grade 8.8 Grade 10.9
um
num
Grade 5.8 or 8.8
M6 x 1.00 6.2 (4.6) 9.5 (7) 13.6 (10)
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) SeeNote3
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. Do not use these values when the torque values are specified on the assembly drawing.
2. These values are based on new plates threads. Increase values by 15% if non-plated threads are used.
3. Hardware threaded into aluminum must have two diameters of thread engagement or may require 30% or more reduction in the torque.
4. Torques are calculated as equivalent stress loading to American hardware and approximately a preload of 90% of yield strength and
friction coefficient of 0.125.