Pin & Key Strength Calculator

Cylindrical pin shear check + parallel key crush/shear check in one tool.

τ = 4F / (πd²Z)

Transverse Force F (N)

Pin Diameter d (mm)

Number of Pins Z

Allowable [τ] (MPa)

τ = - MPa

σ_p=4T/(DdL) | τ=2T/(DdL)

Torque T (N·mm)

Shaft Dia D (mm)

Pin Dia d (mm)

Pin Length L (mm)

Allow. Crush (MPa)

Allow. Shear (MPa)

σ_p=-MPa
τ=-MPa

P=2T/(Dkl) | τ=2T/(Dbl) | k=h/2, l=L−b

Torque T (N·m)

Shaft Dia D (mm)

Key Width b (mm)

Key Height h (mm)

Key Length L (mm)

Allow. Crush (MPa)

Allow. Shear (MPa)

Working length l=-mm | k=h/2=-mm
Crush P=-MPa | Shear τ=-MPa