Metric Thread Calculator

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Calculates the dimensions of metric bolt and nut threads, including major diameter, pitch, and minor diameter.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Nominal Diameter (mm) in the units shown.

Step 2

Read Pitch (mm), Major Diameter (mm), and Minor Diameter (mm) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Nominal Diameter (mm): M6

Pitch (mm): 1 mm; Major Diameter (mm): 6 mm; Minor Diameter (mm): 4.9175 mm

Nominal Diameter (mm): M8

Pitch (mm): 1.25 mm; Major Diameter (mm): 8 mm; Minor Diameter (mm): 6.646875 mm

Nominal Diameter (mm): M10

Pitch (mm): 1.5 mm; Major Diameter (mm): 10 mm; Minor Diameter (mm): 8.37625 mm

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