How to Use the Bolt Torque Checker
Tightening a bolt to the wrong torque causes problems either way. Too little torque risks the joint loosening from vibration, while too much can strip the threads or snap the bolt outright. Select a bolt size and grade, and this tool instantly shows the generally recommended tightening torque in both ft-lb and in-lb.
Grade is typically marked on the bolt head — higher grades (Grade 8 over Grade 5) can handle more clamping force, so the recommended torque goes up for the same size. Stainless bolts (18-8) are generally softer than Grade 5 steel, so they call for lower torque to avoid galling or stripping. These values are general reference figures for dry, unlubricated threads — for safety-critical work like automotive or structural assembly, always confirm the manufacturer's exact torque spec and tighten with a calibrated torque wrench.
Frequently Asked Questions
Too little torque can let the bolt loosen from vibration, while too much can strip threads or snap the bolt. The right torque keeps the joint secure without damaging the fastener.
These are general reference values for dry, unlubricated threads. For safety-critical work like automotive or structural assembly, always follow the manufacturer's exact torque spec.