Declared metric thread geometry
External thread tensile area
Inputs
User-entered external metric thread basic major diameter; a thread standard is not selected.
User-entered thread pitch in mm; material and strength are not inferred.
Results
Empirical tensile-area diameter
10.358
External thread tensile stress area
84.267
At = 0.7854(D − 0.938194P)²
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Axial response · Beam deflection & reactions · Elastic stability · Solid-shaft torsion
Method
Formula, when it applies, and when it does not
Calculate empirical tensile-stress area from an external-thread basic major diameter and pitch without selecting a standard or interpreting strength.
At = 0.7854(D − 0.938194P)²
When
- External metric thread relation
- Declared pitch
- Empirical tensile-area arithmetic only
Don’t
- This is an empirical external metric-thread tensile-area relation from user-entered basic major diameter and pitch. It does not select a thread standard, determine material strength, preload, fatigue, stripping, tightening torque, acceptance, safety, or approval.
ISO 898-1 — mechanical properties of fasteners