Bolt Torque Chart
Manufacturer specs come first. Match the grade, thread and dry/lubricated condition. General reference only. Swipe tables sideways on a phone.
SAE Grade 5 — Coarse & Fine Threads
SAE: ft-lb; 1/4 and 5/16 rows also show in-lb. Dry/plain K=0.20; dry/zinc K=0.17; lubricated K=0.15.
| Thread | Dry / Plain (ft-lb) | Dry / Zinc (ft-lb) | Lubricated (ft-lb) |
|---|---|---|---|
| 1/4-20 | 102.0 in-lb 8.5 ft-lb |
86.4 in-lb 7.2 ft-lb |
75.6 in-lb 6.3 ft-lb |
| 5/16-18 | 208.8 in-lb 17.4 ft-lb |
177.6 in-lb 14.8 ft-lb |
157.2 in-lb 13.1 ft-lb |
| 3/8-16 | 30.9 | 26.2 | 23.2 |
| 7/16-14 | 49.4 | 42.0 | 37.1 |
| 1/2-13 | 75.4 | 64.1 | 56.5 |
| 9/16-12 | 108.7 | 92.4 | 81.6 |
| 5/8-11 | 150.1 | 127.6 | 112.6 |
| 3/4-10 | 266.5 | 226.5 | 199.9 |
| 7/8-9 | 429.3 | 364.9 | 322.0 |
| 1-8 | 643.6 | 547.1 | 482.7 |
| 1/4-28 | 116.4 in-lb 9.7 ft-lb |
98.4 in-lb 8.2 ft-lb |
86.4 in-lb 7.2 ft-lb |
| 5/16-24 | 231.6 in-lb 19.3 ft-lb |
196.8 in-lb 16.4 ft-lb |
174.0 in-lb 14.5 ft-lb |
| 3/8-24 | 35.0 | 29.7 | 26.2 |
| 7/16-20 | 55.2 | 46.9 | 41.4 |
| 1/2-20 | 85.0 | 72.2 | 63.7 |
| 9/16-18 | 121.3 | 103.1 | 91.0 |
| 5/8-18 | 170.0 | 144.5 | 127.5 |
| 3/4-16 | 297.2 | 252.6 | 222.9 |
| 7/8-14 | 473.7 | 402.6 | 355.2 |
| 1-14 | 722.4 | 614.0 | 541.8 |
SAE Grade 8 — Coarse & Fine Threads
SAE: ft-lb; 1/4 and 5/16 rows also show in-lb. Dry/plain K=0.20; dry/zinc K=0.17; lubricated K=0.15.
| Thread | Dry / Plain (ft-lb) | Dry / Zinc (ft-lb) | Lubricated (ft-lb) |
|---|---|---|---|
| 1/4-20 | 142.8 in-lb 11.9 ft-lb |
121.2 in-lb 10.1 ft-lb |
106.8 in-lb 8.9 ft-lb |
| 5/16-18 | 295.2 in-lb 24.6 ft-lb |
250.8 in-lb 20.9 ft-lb |
220.8 in-lb 18.4 ft-lb |
| 3/8-16 | 43.6 | 37.0 | 32.7 |
| 7/16-14 | 69.8 | 59.3 | 52.3 |
| 1/2-13 | 106.4 | 90.5 | 79.8 |
| 9/16-12 | 153.5 | 130.5 | 115.1 |
| 5/8-11 | 211.9 | 180.1 | 158.9 |
| 3/4-10 | 376.3 | 319.8 | 282.2 |
| 7/8-9 | 606.0 | 515.1 | 454.5 |
| 1-8 | 908.6 | 772.3 | 681.5 |
| 1/4-28 | 163.2 in-lb 13.6 ft-lb |
139.2 in-lb 11.6 ft-lb |
122.4 in-lb 10.2 ft-lb |
| 5/16-24 | 326.4 in-lb 27.2 ft-lb |
277.2 in-lb 23.1 ft-lb |
244.8 in-lb 20.4 ft-lb |
| 3/8-24 | 49.4 | 42.0 | 37.1 |
| 7/16-20 | 77.9 | 66.2 | 58.4 |
| 1/2-20 | 120.0 | 102.0 | 90.0 |
| 9/16-18 | 171.3 | 145.6 | 128.4 |
| 5/8-18 | 240.0 | 204.0 | 180.0 |
| 3/4-16 | 419.6 | 356.6 | 314.7 |
| 7/8-14 | 668.7 | 568.4 | 501.5 |
| 1-14 | 1019.8 | 866.9 | 764.9 |
Metric Class 8.8 — Coarse Threads
Coarse threads only. N·m first, ft-lb in parentheses; M5/M6 also show in-lb. Dry K=0.20; lubricated K=0.15. Coatings and lubricants may differ.
| Thread | Dry: N·m (ft-lb) | Lubricated: N·m (ft-lb) |
|---|---|---|
| M5 × 0.8 | 6.2 N·m 55.2 in-lb / 4.6 ft-lb |
4.6 N·m 40.8 in-lb / 3.4 ft-lb |
| M6 × 1.0 | 10.5 N·m 92.4 in-lb / 7.7 ft-lb |
7.9 N·m 69.6 in-lb / 5.8 ft-lb |
| M8 × 1.25 | 25.5 (18.8) | 19.1 (14.1) |
| M10 × 1.5 | 50.5 (37.2) | 37.8 (27.9) |
| M12 × 1.75 | 88.0 (64.9) | 66.0 (48.7) |
| M14 × 2.0 | 140.0 (103.3) | 105.0 (77.4) |
| M16 × 2.0 | 219.0 (161.5) | 164.0 (121.0) |
| M18 × 2.5 | 311.0 (229.4) | 233.0 (171.9) |
| M20 × 2.5 | 441.0 (325.3) | 331.0 (244.1) |
| M22 × 2.5 | 600.0 (442.5) | 450.0 (331.9) |
| M24 × 3.0 | 762.0 (562.0) | 572.0 (421.9) |
Metric Class 10.9 — Coarse Threads
Coarse threads only. N·m first, ft-lb in parentheses; M5/M6 also show in-lb. Dry K=0.20; lubricated K=0.15. Coatings and lubricants may differ.
| Thread | Dry: N·m (ft-lb) | Lubricated: N·m (ft-lb) |
|---|---|---|
| M5 × 0.8 | 8.8 N·m 78.0 in-lb / 6.5 ft-lb |
6.6 N·m 58.8 in-lb / 4.9 ft-lb |
| M6 × 1.0 | 15.0 N·m 133.2 in-lb / 11.1 ft-lb |
11.3 N·m 99.6 in-lb / 8.3 ft-lb |
| M8 × 1.25 | 36.5 (26.9) | 27.3 (20.1) |
| M10 × 1.5 | 72.2 (53.3) | 54.2 (40.0) |
| M12 × 1.75 | 126.0 (92.9) | 94.5 (69.7) |
| M14 × 2.0 | 200.0 (147.5) | 150.0 (110.6) |
| M16 × 2.0 | 313.0 (230.9) | 235.0 (173.3) |
| M18 × 2.5 | 430.0 (317.2) | 323.0 (238.2) |
| M20 × 2.5 | 610.0 (449.9) | 458.0 (337.8) |
| M22 × 2.5 | 830.0 (612.2) | 622.0 (458.8) |
| M24 × 3.0 | 1055.0 (778.1) | 791.0 (583.4) |
Metric Class 12.9 — Coarse Threads
Coarse threads only. N·m first, ft-lb in parentheses; M5/M6 also show in-lb. Dry K=0.20; lubricated K=0.15. Coatings and lubricants may differ.
| Thread | Dry: N·m (ft-lb) | Lubricated: N·m (ft-lb) |
|---|---|---|
| M5 × 0.8 | 10.3 N·m 91.2 in-lb / 7.6 ft-lb |
7.7 N·m 68.4 in-lb / 5.7 ft-lb |
| M6 × 1.0 | 17.5 N·m 154.8 in-lb / 12.9 ft-lb |
13.2 N·m 116.4 in-lb / 9.7 ft-lb |
| M8 × 1.25 | 42.6 (31.4) | 32.0 (23.6) |
| M10 × 1.5 | 84.4 (62.3) | 63.3 (46.7) |
| M12 × 1.75 | 147.0 (108.4) | 110.0 (81.1) |
| M14 × 2.0 | 234.0 (172.6) | 176.0 (129.8) |
| M16 × 2.0 | 365.0 (269.2) | 274.0 (202.1) |
| M18 × 2.5 | 503.0 (371.0) | 377.0 (278.1) |
| M20 × 2.5 | 713.0 (525.9) | 535.0 (394.6) |
| M22 × 2.5 | 970.0 (715.4) | 727.0 (536.2) |
| M24 × 3.0 | 1233.0 (909.4) | 925.0 (682.2) |
Reference Notes
Choose the Right Condition
- Dry / plain: unplated steel, no added lubricant; reference nut factor K = 0.20.
- Dry / zinc: zinc-plated SAE bolts, no added lubricant; reference K = 0.17. Waxed or specially coated hardware may differ.
- Lubricated: reference K = 0.15. This is not a universal value for every oil, grease, anti-seize or threadlocker; follow the specific product and equipment instructions.
Check your torque wrench units. 12 in-lb = 1 ft-lb; 1 ft-lb ≈ 1.356 N·m. Do not confuse inch-pounds with foot-pounds.
Identify the Bolt
- SAE Grade 5: commonly identified by three radial lines on the bolt head.
- SAE Grade 8: commonly identified by six radial lines on the bolt head.
- Metric: look for the property-class marking, such as 8.8, 10.9 or 12.9.
These tables do not cover stainless steel, brass, nylon, damaged hardware, prevailing-torque locknuts or torque-to-yield fasteners. Follow the applicable tightening procedure for those products.
Call Crowbar’s at 319-200-2769 or stop in at 4151 3rd Ave, Suite 101, Marion, Iowa.
Reference basis: Fastenal’s SAE torque-tension chart and metric torque-tension chart. SAE values calculated from the published clamp loads using T = K × diameter × clamp load, then converted to ft-lb and rounded to one decimal. Metric N·m values follow the published chart; ft-lb values are conversions. Added in-lb values are converted from the displayed rounded ft-lb values (12 in-lb = 1 ft-lb). The source uses target clamp loads of 75% of proof load. These are general reference values, not an assembly specification.