Online Tool Store
Bolt Torque Spec Calculator
Review a sample M8 grade 8.8 torque recommendation and copy the displayed dry, non-lubricated result for reference.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example
Bolt Torque Spec Calculator
Sample: M8, grade 8.8
Example shown — replace it with your own bolt size and grade.
Bolt size
M8 × 1.25
Grade
8.8
Result
How it works
- Enter the bolt size and thread pitch.
- Select the bolt's grade.
- Get a recommended torque range for tightening.
The method
Standard fastener torque charts are used to look up a recommended range by bolt size, pitch, and grade, assuming dry, non-lubricated threads unless noted.
FAQ
Why does bolt grade matter for torque?
Higher-grade bolts are made from stronger material and can handle more clamping force, so their recommended torque is higher than a lower-grade bolt of the same size.
Does lubrication change the torque value?
Yes — lubricated or plated bolts typically need less torque to reach the same clamping force than dry, non-lubricated ones. Always check whether your spec assumes dry or lubricated threads.
Is this a substitute for a manufacturer's torque spec?
No — always use the manufacturer or engineering spec for critical or safety-related applications; this is a general reference based on standard charts.
How we compare
| Feature | Online Tool Store | Printed torque chart | Guessing by feel |
|---|---|---|---|
| No software install | Yes | Yes | Yes |
| Quick to start | Yes | Search required | Fast but risky |
| Free to use | Yes | Free | Free |
For a quick lookup without hunting through a printed chart, this gets you a reference number faster.