US Recommended Bolt Torque
| Size | Recommended Torque | |
|---|---|---|
| Grade 2 | Grade 8 | |
| 7/8″ | 129 | 454 |
| 1″† | 188 | 682 |
| * Sizes from #4 to #10 are in lb-in. Sizes from 1/4″ up are in lb-ft. † Fine thread figures are for 1″-14. Grade 2, 5, and 8 values are for slightly lubricated bolts. |
What is the torque of a screw?
Torque is the measurement of twisting force needed to thread the fasteners together.
What is the torque on a 8.8 Bolt?
Metric Recommended Bolt Torque
| Bolt Diameter (mm) | Recommended Torque (Nm) | |
|---|---|---|
| Class 8.8 | Class 10.9 | |
| 8 | 30 | 40 |
| 10 | 55 | 75 |
| 12 | 100 | 135 |
How hard is it to break a Grade 8 bolt?
The tensile strength of a grade 8 bolt is 150,000 pounds per square inch. A properly designed bolted connection will be able to withstand far more than the expected maximum stress to which it will be subjected while it is in service. …
What is the torque on a 5’8 stud?
In general, 1/2-inch studs typically have a torque range of 75 to 85 foot pounds; 9/16-inch studs range from 135 to 145 foot pounds; 5/8-inch studs run from 190 to 210 foot pounds.
How do I find torque specs?
Begin with the formula T = K x U x D x P, where T is the torque, K is a standard representing 1.33, U is the coefficient of friction, D is the diameter of the fasteners, and P is the necessary preload.
What is the torque for M4 bolt?
Torque Specifications
| Size | Min | Max |
|---|---|---|
| M4 | 23 | 3.2 |
| M5 | 46 | 6.3 |
| M6 | 79 | 10.9 |
| M8 | 190 | 26.4 |
What is the torque for 5/8 bolt?
ASTM A449 / SAE Grade 5*
| Bolt Size | TPI | Tightening Torque (ft lbs) |
|---|---|---|
| Galv+Waxed | ||
| 1⁄2 | 13 | 38 |
| 9⁄16 | 12 | 54 |
| 5⁄8 | 11 | 75 |
Is Grade 8 bolt the strongest?
Commercial-grade 8 bolts are the strongest option available. They’re made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.
