Le Thread Self-Locking Condition Calculator is a practical engineering tool designed to evaluate whether a threaded connection can maintain self-locking performance under different operating conditions. By analyzing key parameters such as thread diameter, pitch, helix angle, friction coefficient, and lubrication condition, it helps engineers determine the risk of thread loosening and back-driving. The Thread Self-Locking Condition Calculator supports screw design, fastener selection, and mechanical reliability analysis while helping improve vibration resistance and connection safety in industrial applications.
Input parameters
Self-locking condition: φeff > λ, where tan(λ) = Lead / (π d₂) and φeff = arctan(μ / cos(β)). Equivalently μ > tan(λ)·cos(β). Safety margin = φeff − λ
