M4 screws and bolts – socket cap, button, Phillips machine screws and hex bolts metric hardware | Monster Bolts

M4 Screws – Socket Cap, Button, Pan (Phillips), Flat (Phillips), Set & Hex Cap Bolts

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The M4 metric screw (4 mm nominal diameter) is widely used across machinery, robotics, 3D printers, and automotive assemblies. This hub brings together Socket Cap, Button, Phillips Pan, Phillips Flat, Set Screws, and Hex Cap Bolts with quick specs, standard DIN references, and direct links to matching M4 nuts, washers, and metric hex keys.

Shop by M4 Head Type

M4 Socket Head Cap Screws

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

M4 Button Head Cap Screws

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

M4 Phillips Pan Machine Screws

Machine thread • For tapped holes or nuts

M4 Phillips Flat Machine Screws

90° countersink • Flush finish • Machine thread

M4 Cup Point Set Screws

Grub screws • Allen/Hex drive • Cup point

M4 Hex Cap Bolts

DIN 933 (full thread) / DIN 931 (partial thread) • External hex drive

Quick Specs

Spec	Details
Diameter	M4 (4.0 mm nominal)
Common Pitch	0.7 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.

M4 Size & Pitch Reference

Need head dimensions, countersink details, or pilot hole guidance? See the M4 screw size chart.

Matching M4 Nuts & Washers

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

Metric Nuts & Washers (All) — filter for M4 to match threads precisely.

Frequently Asked Questions

What’s the standard thread pitch for M4 screws?

The most common pitch is 0.7 mm (coarse). Always confirm on the specific item page.

How do Hex Cap Bolts differ from Socket Cap Screws?

Socket Cap Screws feature an internal hex/Allen drive (DIN 912), while Hex Cap Bolts have an external hex head (DIN 933 full thread or DIN 931 partial thread) for use with a wrench or socket tool.

Does black oxide prevent rust?

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

Are M4 machine screws suitable for plastics?

Standard machine-thread M4 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 | M3 Screws