Bolt Torque Calculator

8.8

Bolt Diameter (mm) Bolt Grade (Metric)

Friction Coefficient (K) 0.20 (Dry)

0.15 = Lubricated | 0.20 = Dry Steel

Required Torque

0 Newton Meters (Nm) 0 ft-lb

Clamp Load (Preload) 0 kN

Proof Load 0 MPa

Safety Factor Analysis

Strategic Implementation of Fastener Integrity

A bolt is only as strong as its preload. The Bolt Torque Calculator employs Deterministic Logic (T = K * D * P) to calculate the precise rotational force required to stretch a bolt within its elastic limit. This ensures structural integrity without risking thread stripping or fatigue failure.

Preload as a Strategic Asset

The clamping force holding a joint together is a Strategic Asset in mechanical design. If torque is too low, the joint loosens under vibration; if too high, the bolt yields. This tool bridges the gap between theoretical mechanics and workshop application, providing actionable data for assembly.

Terminal Value of Joint Reliability

The Terminal Value of a machine depends on its connections. Torque specifications are critical for safety in automotive, aerospace, and industrial applications. This calculator adjusts for friction coefficients (lubrication), ensuring that the applied torque translates correctly into clamping force.

Technical Metrics Explained

K-Factor (Nut Factor): A coefficient summarizing friction in threads and under the bolt head. It significantly affects the torque-tension relationship.
Proof Load: The maximum tensile force a bolt can withstand without permanent deformation (typically 85-90% of yield strength).