Question

What is a #4 screw?

Answer 1

The closest size screw in metric to a #4-40 machine screw is M3.Apr 10, 2012

Without Metric Threads We're Screwed | The Metric Maven

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Fastener Conversion Chart

Inch Equivalent		Metric Size-PitchISO and IFI Rec.
3- 48	3- 56	M2.5x 0.45
4- 40	4- 48	M3x .5
6- 32	6- 40	M3.5x .6
8- 32	8- 36	M4x .7

13 more rows

Metric Bolt Conversion | Elgin Fasteners

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#4 x 1/2 Slotted Oval Head Wood Screw. This is a #4 diameter by 1/2 inch long wood screw that has a slotted oval head.