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?
How do Hex Cap Bolts differ from Socket Cap Screws?
Does black oxide prevent rust?
Are M4 machine screws suitable for plastics?
Order with Confidence
Monster Bolts ships fast from the USA and backs every order with helpful support. Need help finding the exact M4 part? Contact our team.
