Thread Engagement / Stripping Calculator

Determine the engagement length needed for a bolt to break in tension before its threads strip

Thread

Bolt (External Thread)

Tapped Hole (Internal Thread)

Engagement

-
Threads Strip First
0.00
Required Le (mm)
0.00
Strip / Tensile Ratio
Bolt tension
Governing Failure
Le 10.0M8

Results

Required Engagement(L_e,req)?
0.00mm
Required Engagement / Diameter(L_e/d)
0.00×d
Strip / Tensile Ratio(L_e/L_e,req)?
0.00-
Bolt Tensile Capacity(F_t)
0N
External Strip Load(F_ext)?
0N
Internal Strip Load(F_int)?
0N
Design looks good

Created by Catlynn Nguyen & Jie Chai · 2026