DLDIVE-LDEngineering Learning
Printable reference · V0.6

Bolted Joint Design Reference

A compact concept-stage reference for preload, torque assumptions and bolted-joint review.

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Bolted Joint Design Reference

Concept relationship

T = K × F × d

T torque, K nut factor, F preload, d nominal diameter.

Main limitation: torque is an indirect way to create preload. Friction under the head/nut and in the threads can dominate the torque–tension relationship.

Review prompts

  • What clamp load is actually required?
  • Can the joint separate or slip under service load?
  • What tightening method controls preload scatter?
  • Are threads, bearing faces and lubrication/coating defined?
  • Is fatigue relevant?
  • Will embedment/relaxation reduce preload?
  • Are temperature differences important?
  • Is locking against loosening required?

Do not infer safety from torque alone

For safety-critical joints, use an appropriate bolted-joint design method, verified fastener/material data and a validated assembly procedure.

DIVE-LD Engineering Learning · Educational reference only. Confirm project-specific requirements, governing standards and supplier capability before release.