Bolt Size Calculator

Load/Force:

Unit:

Load/Force direction:

Choose Bolt Size:

Metric Bolt Grade:

Bolt Quantity:

Note: A better bolt grade means the design needs a smaller bolt area. Bolt and similar fastener specifications and normatives can be found in the DIN EN ISO 898-1 standard.

Calculation:

Calculation output:

Results:

Results output:

Frequently Asked Questions

What does Bolt Size Calculator do?

Metric bolt size calculator: check shear and yield capacity by bolt size, quantity and grade (8.8/10.9/12.9) against your load requirement.

How do I use

Enter the applied load (kN), number of bolts, bolt size (M6 to M48), and material grade (8.8/10.9/12.9). The calculator checks whether the bolt passes yield or shear stress for your load.

Is Bolt Size Calculator free to use?

Yes. This metric bolt size and grade calculator is free and runs in the browser without any installation.