M4 Screws – Socket Cap, Button, Pan (Phillips), Flat (Phillips), Set & Hex Cap Bolts
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Home › Metric Fasteners › M4 Screws 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 o