Button Head Hex Socket Machine Screws — M3, M4, M5 | A2 Stainless Steel & Black | DIN 7380 Button head hex socket screws (DIN 7380) combine a wide, low-profile dome head with an internal hex (Allen) socket drive, making them the go-to fastener for panel mounting, electronics enclosures, 3D printer frames, CNC machine assembly, bicycle components, and any application where a clean, low-profile appearance matters. Available in M3, M4, and M5 diameters with lengths from 5mm to 30mm, in both A2 stainless steel (corrosion-resistant, silver finish) and black oxide (matte black, light corrosion protection). Pack quantities from 5 to 100 pieces let you order exactly what you need. The dome head profile provides a larger bearing surface than a standard socket cap screw head, distributing clamping load over a wider area — particularly useful when fastening into softer materials like aluminum, plastic, or wood. The hex socket drive requires a standard Allen key (hex wrench): 2mm for M3, 2.5mm for M4, 3mm for M5. The thread is ISO metric coarse pitch, compatible with standard metric nuts, threaded inserts, and tapped holes. These screws conform to DIN 7380, the widely recognized German standard for button head hex socket screws, ensuring dimensional consistency and compatibility with standard metric hardware. 🔩 Compatibility: ISO metric coarse pitch — M3 (0.5mm pitch), M4 (0.7mm), M5 (0.8mm). Hex socket drive: M3 = 2mm key | M4 = 2.5mm key | M5 = 3mm key. Requires a pre-tapped hole or nut. Not self-tapping. No countersinking required. ✅ Key Features of These Button Head Hex Socket Screws 🔵Two Finish Options — A2 Stainless Steel & Black Oxide — A2 stainless (304) provides excellent corrosion resistance for outdoor, marine, and food-adjacent applications with a bright silver finish. Black oxide offers a matte black aesthetic with light corrosion protection, ideal for indoor and decorative applications. Select your preferred finish when ordering. 📐Three Metric Sizes — M3, M4, M5 — Available in M3, M4, and M5 diameters with multiple lengths per size (5–30mm depending on diameter), covering the most common small metric machine screw sizes for electronics, fabrication, and hardware applications. 🔧Low-Profile Dome Head — DIN 7380 — The wide, rounded button head sits above the surface when installed, providing a large bearing surface and a clean, finished appearance. Lower profile than standard socket cap screws (DIN 912), making it suitable for space-constrained applications and visible fastening locations. 🔩Hex Socket Drive — Allen Key Compatible — Internal hex socket drive is compatible with standard metric Allen keys and hex bit drivers. M3 uses 2mm, M4 uses 2.5mm, and M5 uses 3mm. Suitable for both hand tools and power tools. Note: button head sockets are shallower than DIN 912 — avoid over-torquing. 📦Flexible Pack Quantities — 5 to 100 Pieces — Choose from 5, 10, 20, 50, or 100 pieces per pack to match your project scale. Larger packs offer better per-unit value for production runs and bulk stocking. ⚙️DIN 7380 Standard — Dimensionally Consistent — Manufactured to DIN 7380 specifications for consistent head diameter, head height, socket depth, and thread dimensions. Compatible with standard metric nuts, threaded inserts, and tapped holes. 📐 Technical Specifications — Button Head Hex Socket Machine Screws DIN 7380 Standard DIN 7380 Head Type Button Head (Dome Head / Low-Profile) Drive Type Hex Socket (Allen / Internal Hex) Thread Standard ISO Metric Coarse Pitch Available Diameters M3, M4, M5 Thread Pitches M3: 0.5mm | M4: 0.7mm | M5: 0.8mm Hex Key Sizes M3: 2mm | M4: 2.5mm | M5: 3mm Available Lengths M3: 5–30mm | M4: 6–30mm | M5: 8–30mm Pack Quantity Options 5 / 10 / 20 / 50 / 100 pcs Finish Options A2 Stainless Steel (silver) | Black Oxide (matte black) A2 Stainless Material 304 Stainless Steel — corrosion resistant Black Oxide Material Carbon Steel with black oxide coating Self-Tapping No — requires pre-tapped hole or nut Countersinking Required No dome head sits above the surface ⚠️ Note: These are machine screws — they require a pre-tapped hole, threaded insert, or nut. They are not self-tapping. Button head screws have a shallower socket than DIN 912 socket cap screws — use the correct hex key size and avoid over-torquing to prevent socket strip-out. Not recommended for high-torque structural applications; use DIN 912 socket cap screws for those. ❓ Frequently Asked Questions What is a button head hex socket screw? A button head hex socket screw (also called a dome head or low-profile socket cap screw) has a wide, low-profile rounded head with a hex (Allen) socket drive. Compared to a standard socket cap screw, the button head has a larger bearing surface and a lower profile, making it suitable for applications where clearance is limited or a cleaner aesthetic is desired. It is driven with a hex key (Allen wrench) rather than a screwdriver. What is the difference between A2 stainless steel and black oxide screws? A2 stainless steel (304 stainless) is a corrosion-resistant alloy suitable for outdoor, marine, and food-adjacent applications with a bright silver finish. Black oxide screws are typically carbon steel with a black chemical conversion coating that provides mild corrosion resistance and a dark matte appearance. Black oxide is primarily a cosmetic and light-protection finish — it is not as corrosion-resistant as stainless steel. Choose A2 for corrosion resistance; choose black for aesthetics or indoor applications. What Allen key size do I need for M3, M4, and M5 button head screws? Per DIN 7380: M3 button head screws use a 2mm hex key; M4 button head screws use a 2.5mm hex key; M5 button head screws use a 3mm hex key. These are the standard ISO metric hex socket sizes for DIN 7380 button head screws. What is DIN 7380? DIN 7380 is a German industrial standard that specifies the dimensions and tolerances for button head hex socket screws. It defines the head diameter, head height, socket size, and thread specifications for metric button head screws. DIN 7380 screws are widely used in machinery, electronics, automotive, and fabrication applications and are compatible with standard metric nuts and tapped holes. Are button head screws as strong as socket cap screws? No. Button head screws have a lower head height and a shallower socket depth than standard socket cap screws (DIN 912), which means they have a lower torque capacity and are more susceptible to socket strip-out if over-torqued. Button head screws are suitable for light to medium-duty applications. For high-torque or high-load structural applications, standard socket cap screws (DIN 912) are recommended. Are these screws self-tapping? No. These are machine screws with a standard metric coarse thread. They require a pre-tapped hole, threaded insert, or nut. They will not cut their own thread into material. What are button head hex socket screws used for? Button head hex socket screws are used in applications where a low-profile head is needed, such as panel mounting, electronics enclosures, 3D printer frames, CNC machine assembly, bicycle components, furniture hardware, and decorative or visible fastening applications. The wide dome head distributes load over a larger area than a standard cap screw head, making it suitable for softer materials like aluminum, plastic, or wood. How many pieces come in each pack? Pack quantities available are 5, 10, 20, 50, and 100 pieces. Select your preferred quantity using the "Amount" selector. Larger packs offer better per-unit value for production or bulk use. 🛒 Select your size, finish, and pack quantity above, then add to cart — ships from our US warehouse.
