Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Mechanical
Screw Torque Calculator
Calculates the torque needed to clamp a fastener to a target axial force, accounting for thread geometry and friction. Use it when tightening critical bolted joints to avoid under- or over-torquing.
Fill in the required fields to see your result.
Mechanical
Shaft Torque Calculator
Determine the minimum shaft diameter needed to safely transmit a given power at a specified speed and shear stress limit. Essential for mechanical designers sizing drive shafts, motor shafts, and spindles.
Fill in the required fields to see your result.
Key differences
| Screw Torque Calculator | Shaft Torque Calculator | |
|---|---|---|
| Category | Mechanical | Mechanical |
| Inputs required | 3 | 4 |
| Result | Required Torque (N⋅mm) | Required Diameter (mm) |
| What it does | Calculates the torque needed to clamp a fastener to a target axial force, accounting for thread geometry and friction. Use it when tightening critical bolted joints to avoid under- or over-torquing. | Determine the minimum shaft diameter needed to safely transmit a given power at a specified speed and shear stress limit. Essential for mechanical designers sizing drive shafts, motor shafts, and spindles. |