Tensile loading
Initial preload, load at yield, and load reserve for metric bolted joints (no friction).
Mechanical Calculators
Bolt and fastener calculations for metric screw joints.
Tightening torque (metric)
Preload and tightening torque for metric screw joints using ISO geometry and EN ISO 898-1 strengths.
Maximum tightening torque
Maximum tightening torque to a target equivalent stress, including stress relaxation.
Basic joint diagram
Bolt joint under dynamic loading — preload, load fluctuation, and clamping force.
Fatigue strength
Endurance strength and allowable load fluctuation for bolted joints.
Joint stiffness factor
Bolt and clamped-part stiffness, and load-sharing factor Cm.
Thread stripping strength
Shear area and stripping load for a given engagement length.