Bolt Bearing Stress Calculator

Inputs

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Total load shared by the bearing fasteners.
N
Number of bolts or pins sharing the load equally.
Use the diameter bearing against the plate or hole.
mm
Thickness of the plate being checked in bearing.
mm
Material bearing stress limit before safety factor.
MPa
Allowable design stress is sigma_allow / N.

Results

Default result
Edit inputs
Bearing stress(sigma_b)
83.33MPa
Pass

Average stress on projected bearing area d*t.

sigma_b = F_bolt / (d*t).

Also computed

Utilization(U)0.6667

Bearing stress divided by design allowable.

Load per fastener(F_bolt)5,000N

5 kN · 1,124 lbf

Projected bearing area(A_b)60mm²

A_b = d*t per fastener.

Design bearing stress(sigma_d)125MPa

allowable / safety factor.

Required thickness(t_req)4mm

Holding diameter fixed.

Required diameter(d_req)6.667mm

Holding thickness fixed.

Method notes 3 notes
  • Load is divided equally across the entered fastener count. Eccentric bolt groups need a bolt-pattern force check first.
  • Projected bearing area is d*t per fastener. This is an average bearing check, not a contact-stress distribution.
  • This does not check bolt shear, bolt tension, plate tear-out, net-section tension, edge distance, fatigue, prying or code-specific resistance factors.

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