What is the proper torque to use on a given bolt?
The first factor is the bolt’s diameter. It takes more force to tighten a 3/4-10 bolt than to tighten a 318-16 bolt because it is larger in diameter. The second factor is the bolt’s grade….What is the Proper Torque to Use on a Given Bolt. by Joe Greenslade.
| Product: 3/4-10 Grade 5 zinc plated bolt | |
|---|---|
| • P= | 23.046 pounds |
Are torque specs for nuts and bolts important?
The Importance of Proper Torque Typically, an under torqued bolt will deform and be unable to provide as much clamping force as needed. An over torqued bolt will break.
What is the torque for 1/2 Grade 8 bolt?
Tightening Torque Guide for Grade 5 & 8 Hex Cap Screws
| GRADE 5 | GRADE 8 | |
|---|---|---|
| Coarse Thread | Coarse Thread | |
| 7/16-20 (.4375) | 7575 | 7/16-20 (.4375) |
| 1/2-20 (.500) | 10200 | 1/2-20 (.500) |
| 9/16-18 (.5625) | 12975 | 9/16-18 (.5625) |
Is it bad to over torque bolts?
Everyone who has ever worked with fasteners has accidentally messed one up at some point. One of the most damaging ways to do that is by over-tightening, or over torquing the fastener. This can result in stripping screws, snapping screw heads and damaging pre-tapped threading.
How much torque can a 1/2 inch bolt take?
ASTM A449 / SAE Grade 5*
| Bolt Size | TPI | Tightening Torque (ft lbs) |
|---|---|---|
| Plain | ||
| 7⁄16 | 14 | 49 |
| 1⁄2 | 13 | 75 |
| 9⁄16 | 12 | 109 |
How do you calculate maximum bolt torque?
The lowest calculated allowable tensile load of Pt, Ps, and Pi should be used to determine maximum torque. The general equation for bolt load based on applied torque is T = KFiDb where K = torque coefficient.
Which torque wrench should I buy?
The bigger the drive and the longer the handle, the more torque they can deliver. Most home mechanics will find that a torque wrench with a 1/2-inch drive and at least an 18-inch handle is the best choice for lug nuts, cylinder heads, suspension bushings, and other likely uses.
