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eng.screw-thread-tensile-stress Calculator
Calculates screw thread tensile stress area and proof load from thread dimensions per ASME B1.13M. The tensile stress area (approximately 75–80% of nominal shank area) is the effective cross-section for bolt load capacity — it's the basis for all thread strength calculations.
Inputs
Nominal Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Thread Pitch Mm
Reference formula or conversion factor shown for context.
Applied Force Kn
Push or pull (N). F = ma. Net force determines acceleration. Account for all forces including gravity and friction.
Thread Standard
Reference formula or conversion factor shown for context.
Results
tensile stress area At (mm²)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
tensile stress (MPa)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
minor diameter d_minor (mm)
The computed diameter -- twice the radius.
pitch diameter d₂ (mm)
The computed diameter -- twice the radius.
ISO 724 At = π/4·((d₂+d_minor)/2)²
The value at the specified point or condition.
M20×2.5 grade 8.8
Letter or numerical grade indicating quality, creditworthiness, or performance on a defined scale.