Initial Torque vs. Final Torque

When you tighten a bolt or screw, you are trying to reach enough clamp load for the joint to stay secure without damaging the fastener or parts. Understanding initial torque vs final torque helps you control that process, especially in critical assemblies that are tightened in stages or with multiple passes.

What Is Initial Torque?

Initial torque is the first tightening value you apply in a multi step process. It is often used to seat components, overcome friction, and bring parts into contact before you move up to a higher torque specification. For a concise definition, see our glossary entry on Initial Torque.

What Is Final Torque?

Final torque is the target tightening value that you use to fully preload the fastener and complete the joint. This is usually the torque listed on drawings, procedures, or service manuals, and it is chosen to achieve the desired clamp load without over stressing the bolt. Learn more in our glossary entry on Final Torque.

Why the Difference Matters

• Joint seating: Initial torque helps parts settle so the final pass is more consistent across all bolts.
• Even preload: Multi step tightening patterns reduce variation in clamp load, especially on flanges and gasketed joints.
• Fastener life: Respecting both initial and final torque values helps avoid under tightening that can lead to loosening, and over tightening that can cause yielding or fatigue failures.

When you are building or servicing bolted joints with our bolts, nuts, and washers, always follow the specified initial torque and final torque steps from your engineering documentation or equipment manual for reliable and repeatable results.