Bolted Joint Analysis Calculator

Analyze preloaded bolted joints including bolt stiffness, member stiffness, load sharing, and separation safety factor.

Initial bolt preload (tightening force).
N
External tensile load on the joint.
N
Axial stiffness of the bolt. kb = Ab*Eb/grip.
kN/mm
Axial stiffness of clamped members. Typically 3-5x bolt stiffness.
kN/mm
Proof strength of bolt. Grade 8.8: 600 MPa, Grade 10.9: 830 MPa.
MPa
Tensile stress area. M10: 58 mm², M12: 84.3 mm².
mm²

Results

Stiffness Ratio C-
Resultant Bolt Load-kN
Resultant Member Load-kN
Separation Safety Factor-
Proof Load Safety Factor-
References: Shigley's Ch. 8 — Bolted Joints; VDI 2230