Maximum dynamic load on a preloaded metric bolt
Maximum fatigue (dynamic) load capacity of a preloaded metric bolted joint, from thread size, property class and joint stiffness.
Maximum dynamic load, F_b74.3184 kN
Minimum preload, F_i,min69.4813 kN
Maximum preload, F_i,max85.4025 kN
Load fluctuation, bolt, ΔF_i14.8637 kN
Load fluctuation, clamped material, ΔF_m59.4547 kN
Fatigue strength, σₐ47.4 MPa
Maximum tensile load, F₀.₂100.2662 MPa
Tensile stress area, Aₜ156.67 mm²
Ultimate tensile strength, Rₘ800 MPa
Yield strength, Rₚ₀.₂640 MPa
Pitch, P2 mm
Pitch diameter, d₂14.701 mm
Root diameter, d₃13.546 mm
Method & references
- Maximum dynamic (fatigue) load for a preloaded metric bolted joint.
The computation is a literal port of the original client-side JavaScript from /calculators/c3_4.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.