Bolt Torque Chart
Recommended tightening torque for metric and SAE bolts with dry threads (μ 0.15), tightened to 70% of yield. Pick a size or a grade for oiled and lubricated values, clamp force and fine threads.
Charts by grade
Metric (ISO 898-1)
SAE J429 (inch)
ASTM (inch)
Stainless steel (ISO 3506-1)
Charts by size
Metric
M1.6
M2
M2.5
M3
M3.5
M4
M5
M6
M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
M27
M30
M33
M36
M39
M42
M45
M48
M52
M56
M60
M64
Inch (UNC / UNF)
#1
#2
#3
#4
#5
#6
#8
#10
#12
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
1-1/8"
1-1/4"
1-3/8"
1-1/2"
1-3/4"
2"
| Size | Class 8.8 | Class 10.9 | Class 12.9 | A2-70 stainless |
|---|---|---|---|---|
| M1.6 | 0.20 N·m0.15 ft·lb | 0.29 N·m0.21 ft·lb | 0.34 N·m0.25 ft·lb | 0.14 N·m0.11 ft·lb |
| M2 | 0.42 N·m0.31 ft·lb | 0.58 N·m0.43 ft·lb | 0.70 N·m0.52 ft·lb | 0.29 N·m0.22 ft·lb |
| M2.5 | 0.84 N·m0.62 ft·lb | 1.18 N·m0.87 ft·lb | 1.41 N·m1.04 ft·lb | 0.59 N·m0.43 ft·lb |
| M3 | 1.43 N·m1.05 ft·lb | 2.01 N·m1.48 ft·lb | 2.41 N·m1.78 ft·lb | 1.01 N·m0.74 ft·lb |
| M3.5 | 2.20 N·m1.62 ft·lb | 3.09 N·m2.28 ft·lb | 3.71 N·m2.74 ft·lb | 1.55 N·m1.14 ft·lb |
| M4 | 3.29 N·m2.43 ft·lb | 4.62 N·m3.41 ft·lb | 5.55 N·m4.09 ft·lb | 2.31 N·m1.71 ft·lb |
| M5 | 6.39 N·m4.71 ft·lb | 8.98 N·m6.62 ft·lb | 10.8 N·m7.95 ft·lb | 4.49 N·m3.31 ft·lb |
| M6 | 11.0 N·m8.15 ft·lb | 15.5 N·m11.5 ft·lb | 18.6 N·m13.7 ft·lb | 7.77 N·m5.73 ft·lb |
| M7 | 17.9 N·m13.2 ft·lb | 25.2 N·m18.6 ft·lb | 30.2 N·m22.3 ft·lb | 12.6 N·m9.28 ft·lb |
| M8 | 26.6 N·m19.6 ft·lb | 37.4 N·m27.6 ft·lb | 44.8 N·m33.1 ft·lb | 18.7 N·m13.8 ft·lb |
| M10 | 52.0 N·m38.3 ft·lb | 73.1 N·m53.9 ft·lb | 87.7 N·m64.7 ft·lb | 36.5 N·m26.9 ft·lb |
| M12 | 89.2 N·m65.8 ft·lb | 125.4 N·m92.5 ft·lb | 150.5 N·m111.0 ft·lb | 62.7 N·m46.2 ft·lb |
| M14 | 141.8 N·m104.6 ft·lb | 199.4 N·m147.1 ft·lb | 239.3 N·m176.5 ft·lb | 99.7 N·m73.5 ft·lb |
| M16 | 217.3 N·m160.3 ft·lb | 305.6 N·m225.4 ft·lb | 366.7 N·m270.4 ft·lb | 152.8 N·m112.7 ft·lb |
| M18 | 303.5 N·m223.9 ft·lb | 426.9 N·m314.8 ft·lb | 512.2 N·m377.8 ft·lb | 213.4 N·m157.4 ft·lb |
| M20 | 424.9 N·m313.4 ft·lb | 597.5 N·m440.7 ft·lb | 717.0 N·m528.8 ft·lb | 298.7 N·m220.3 ft·lb |
| M22 | 579.7 N·m427.6 ft·lb | 815.2 N·m601.3 ft·lb | 978.2 N·m721.5 ft·lb | 407.6 N·m300.6 ft·lb |
| M24 | 731.9 N·m539.8 ft·lb | 1029.2 N·m759.1 ft·lb | 1235.0 N·m910.9 ft·lb | 514.6 N·m379.5 ft·lb |
| M27 | 1074.4 N·m792.4 ft·lb | 1510.9 N·m1114.4 ft·lb | 1813.1 N·m1337.3 ft·lb | 755.4 N·m557.2 ft·lb |
| M30 | 1462.1 N·m1078.4 ft·lb | 2056.1 N·m1516.5 ft·lb | 2467.3 N·m1819.8 ft·lb | 1028.1 N·m758.3 ft·lb |
| M33 | 1968.2 N·m1451.6 ft·lb | 2767.7 N·m2041.4 ft·lb | 3321.3 N·m2449.7 ft·lb | 1383.9 N·m1020.7 ft·lb |
| M36 | 2537.8 N·m1871.8 ft·lb | 3568.8 N·m2632.2 ft·lb | 4282.6 N·m3158.6 ft·lb | 1784.4 N·m1316.1 ft·lb |
| M39 | 3272.1 N·m2413.3 ft·lb | 4601.3 N·m3393.8 ft·lb | 5521.6 N·m4072.5 ft·lb | 2300.7 N·m1696.9 ft·lb |
| M42 | 4060.9 N·m2995.2 ft·lb | 5710.6 N·m4212.0 ft·lb | 6852.8 N·m5054.3 ft·lb | — |
| M45 | 5052.8 N·m3726.8 ft·lb | 7105.5 N·m5240.8 ft·lb | 8526.6 N·m6288.9 ft·lb | — |
| M48 | 6120.7 N·m4514.4 ft·lb | 8607.3 N·m6348.4 ft·lb | 10328.7 N·m7618.1 ft·lb | — |
| M52 | 7832.1 N·m5776.6 ft·lb | 11013.8 N·m8123.4 ft·lb | 13216.6 N·m9748.1 ft·lb | — |
| M56 | 9769.5 N·m7205.6 ft·lb | 13738.3 N·m10132.9 ft·lb | 16486.0 N·m12159.5 ft·lb | — |
| M60 | 12077.4 N·m8907.8 ft·lb | 16983.9 N·m12526.7 ft·lb | 20380.6 N·m15032.0 ft·lb | — |
| M64 | 14550.0 N·m10731.5 ft·lb | 20460.9 N·m15091.2 ft·lb | 24553.1 N·m18109.5 ft·lb | — |
| Size | SAE Grade 2 | SAE Grade 5 | SAE Grade 8 |
|---|---|---|---|
| #1 | — | — | — |
| #2 | — | — | — |
| #3 | — | — | — |
| #4 | — | — | — |
| #5 | — | — | — |
| #6 | — | — | — |
| #8 | — | — | — |
| #10 | — | — | — |
| #12 | — | — | — |
| 1/4" | 5.60 ft·lb7.59 N·m | 9.03 ft·lb12.2 N·m | 12.8 ft·lb17.3 N·m |
| 5/16" | 11.1 ft·lb15.0 N·m | 17.8 ft·lb24.2 N·m | 25.2 ft·lb34.2 N·m |
| 3/8" | 19.1 ft·lb25.9 N·m | 30.8 ft·lb41.7 N·m | 43.5 ft·lb59.0 N·m |
| 7/16" | 30.0 ft·lb40.7 N·m | 48.4 ft·lb65.6 N·m | 68.4 ft·lb92.8 N·m |
| 1/2" | 46.6 ft·lb63.2 N·m | 75.2 ft·lb102.0 N·m | 106.3 ft·lb144.1 N·m |
| 9/16" | 66.2 ft·lb89.7 N·m | 106.8 ft·lb144.8 N·m | 150.9 ft·lb204.6 N·m |
| 5/8" | 92.0 ft·lb124.7 N·m | 148.4 ft·lb201.2 N·m | 209.7 ft·lb284.3 N·m |
| 3/4" | 161.8 ft·lb219.3 N·m | 261.0 ft·lb353.9 N·m | 368.9 ft·lb500.1 N·m |
| 7/8" | 163.5 ft·lb221.7 N·m | 418.0 ft·lb566.7 N·m | 590.7 ft·lb800.9 N·m |
| 1" | 244.5 ft·lb331.4 N·m | 624.9 ft·lb847.3 N·m | 883.2 ft·lb1197.4 N·m |
| 1-1/8" | 346.4 ft·lb469.7 N·m | 779.5 ft·lb1056.9 N·m | 1251.7 ft·lb1697.0 N·m |
| 1-1/4" | 484.8 ft·lb657.4 N·m | 1090.9 ft·lb1479.1 N·m | 1751.7 ft·lb2375.0 N·m |
| 1-3/8" | 637.4 ft·lb864.2 N·m | 1434.2 ft·lb1944.5 N·m | 2303.0 ft·lb3122.4 N·m |
| 1-1/2" | 840.8 ft·lb1140.0 N·m | 1891.9 ft·lb2565.1 N·m | 3037.9 ft·lb4118.8 N·m |
| 1-3/4" | — | — | — |
| 2" | — | — | — |
Torque per ISO 16047 / VDI 2230 for standard hex heads. These are estimates for joints without a manufacturer's specification. For brakes, steering, wheels, cylinder heads and other safety-critical joints use the OEM value and procedure.