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tool.thread-pitch-engagement Calculator
Calculates minimum thread engagement length and tensile stress area for a bolted joint from thread pitch, material strength, and safety factor. Thread engagement less than 1× the bolt diameter in steel risks thread stripping before bolt fracture — the weakest failure mode.
Inputs
Bolt Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Pitch Mm
Reference formula or conversion factor shown for context.
Material Tensile Mpa
Maximum stress before fracture. Structural steel: 400–700 MPa. Aluminium alloys: 200–500 MPa.
Bolt Preload N
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Results
minimum thread engagement (mm)
The smallest value in the dataset or feasible range.
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.
bolt 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.