Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

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.

Related Documents

Search

Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

This page can be cited as

  • The Engineering ToolBox (2018). Screws - Metric vs. Inches. [online] Available at: https://www.engineeringtoolbox.com/screws-metric-inches-equivalents-convert-conversions-d_2056.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter

















































3.27.8

.