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Screws - Metric vs. Inches

Metric versus Imperial equivalent screw dimensions.

US machine screws

Metric screws and their approximately imperial equivalents:

Screws - Metric vs. Inches
Metric Imperial
Diameter
(mm)
Length
(mm)
Nominal Size
no.
Length
(in)
3 12 4 1/2
3 20 4 3/4
3 25 4 1
3.5 12 6 1/2
3.5 16 6 5/8
3.5 20 6 3/4
3.5 25 6 1
3.5 30 6 1 1/4
4 20 8 3/4
4 25 8 1
4 30 8 1 1/4
4 40 8 1 1/2
4 45 8 1 3/4
4 50 8 2
4 60 8 2 1/2
4 70 8 2 3/4
5 30 10 1 1/4
5 40 10 1 1/2
5 50 10 2
5 60 10 2 1/2
5 70 10 2 3/4
5 80 10 3
5 90 10 3 1/2
5 100 10 4
6 50 12 2
6 60 12 2 1/2
6 70 12 2 3/4
6 80 12 3
6 90 12 3 1/2
6 100 12 4

Example from the table: M4 x 60 equals approximately to #8 x 2 1/2 

Related Topics

  • Fasteners

    Bolts, nuts and threaded rods - torque, tension and loads.

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