Correct torque share
Torsional stress uses torque acting in the thread, not total tightening torque.
Bolted joints
Bolt Stress Calculator
Calculate tensile, torsional, and von Mises equivalent stress from preload and thread torque.
ISO898
02
Results
Set the inputs and start the calculation.
Check local assembly stress
What this calculator does
Preload, thread geometry, and thread torque produce tensile, torsional, and equivalent stress plus utilization.
Equivalent stress represents local tightening stress. External axial load, bending, transverse load, notch effects, and fatigue are not included.
Typical tasks
- Compare assembly utilization
- Study thread-torque influence
- Preselect property classes
Design notes and follow-up standards
Check before release
Add service load
Determine load sharing between bolt and clamped parts from their compliances.
Fatigue and shear
Alternating load and possible joint slip require separate checks.
Useful follow-up standards
VDI 2230 Part 1
Complete assembly, service, fatigue, and clamp-load verification.
ISO 898-1
Mechanical properties and proof stresses for carbon and alloy steel bolts.
ISO 898-2
Account for capacity of the mating nut or internal thread.