Calculate tightening torque, preload and surface pressure for hex head, socket head and countersunk screws. Customized head shapes, hole chamfers, reduced shanks and materials are available options.

Based on VDI 2230:2014

Bossard calculators and converters are designed for engineers, technicians, designers and students involved in the development and assembly of bolted joints. 

 

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Fastener where torque will be applied
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Clearance hole - ISO 273
Chamfer diameter dha Login required I
Reduced shank
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Reduced shank diameter dT Login required I
Mechanical properties of material, thread size and friction
Property class of screw
Minimum yield strength of screw Rp02 Login required
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Data used in calculation
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Results
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