M4 Screws – Socket Cap, Button, Pan (Phillips), Flat (Phillips), Set, Nuts & Washers

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The M3 metric screw (3 mm nominal diameter) is a staple for electronics, robotics, 3D printers, and compact assemblies. This hub consolidates core M3 options—Socket Cap, Button, Phillips Pan, Phillips Flat, and Set Screws— with quick specs and direct links to matching M3 nuts, washers, and metric hex keys.

Shop by M3 Head Type

M3 Socket Head Cap Screws

DIN 912 / ISO 4762 • High clamp force • Allen/Hex drive

M3 Button Head Cap Screws

ISO 7380 • Low profile dome head • Allen/Hex drive

M3 Phillips Pan Machine Screws

Machine thread • For tapped holes or nuts

M3 Phillips Flat Machine Screws

90° countersink • Flush finish • Machine thread

M3 Cup Point Set Screws

Grub screws • Allen/Hex drive • Cup point

Quick Specs

Spec	Details
Diameter	M3 (3.0 mm nominal)
Common Pitch	0.5 mm (coarse)
Typical Drive	Metric hex/Allen (varies by head). Need a key? Hex Key Hub or Individual Metric Keys.
Materials & Finishes	12.9 alloy steel, 18-8/A2 stainless, A4/316 where noted; black oxide on alloy where specified.

M3 Size & Pitch Reference

Need head dimensions, countersink details, or pilot hole guidance? See the M3 screw size chart.

Matching M3 Nuts & Washers

Pair your screws with the right hardware for a complete fastening solution:

Metric Nuts & Washers (All) — filter for M3 to match threads precisely.

Frequently Asked Questions

What’s the standard thread pitch for M3 screws?

The most common pitch is 0.5 mm (coarse). Always confirm on the specific item page.

Which hex key sizes are typical for M3 socket screws?

It varies by head style and manufacturer. For replacements, visit the Hex Key Hub or pick up Individual Metric Keys.

Does black oxide prevent rust?

Black oxide provides a mild protective layer and a dark appearance. For outdoor or high-moisture environments, stainless is generally the better choice.

Are M3 machine screws suitable for plastics?

Standard machine-thread M3 screws are intended for tapped holes (or inserts) or use with nuts. For direct fastening into plastics, use thread-forming/cutting screws designed for plastics.

Explore related sizes:

M2 Screws | M4 Screws