Clevis Pin Calculator

Inputs

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Load carried by the clevis pin.
N
Clevis pin diameter.
mm
Use 2 for a typical clevis pin in double shear.
Thickness of the center lug or rod end eye bearing on the pin.
mm
Thickness of one outside fork lug.
mm
Distance between the approximate reaction centers of the two fork lugs for the pin-bending model.
mm
Pin material allowable shear stress before safety factor.
MPa
Allowable bearing stress for the lugs before safety factor.
MPa
Pin material allowable bending stress before safety factor.
MPa
Design allowable stress is allowable / safety factor.

Results

Default result
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Max utilization(U)
0.8383
Pass

Worst of shear, bending and bearing checks.

Also computed

Pin shear stress(tau)19.65MPa

tau = F / (n*pi*d^2/4).

Pin bending stress(sigma_b)104.8MPa

Simplified clevis model: M = F*s/4, sigma = M/S.

Eye bearing stress(p_e)55.56MPa

Fork bearing stress(p_f)34.72MPa

Required diameter, bending(d_b)16.97mm

Required diameter, shear(d_s)9.213mm

Method notes 3 notes
  • The bending check treats the pin as a simply supported beam over the bearing-center span with a central load. Real bearing pressure is distributed, so this is a conservative first-pass model only.
  • Bearing checks use projected area d*t. Fork bearing assumes each outside lug carries half the total load.
  • This does not check lug tear-out, net-section tension, pin-hole clearance, fatigue, cotter holes, retaining hardware, shock loads or code-specific resistance factors.

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