DIN912 Hex Socket Cap Head Screws — 304 Stainless Steel, M3 / M4 / M5, 10-Piece Sets When you need a fastener that disappears into the assembly — flush, strong, and tamper-resistant — the hex socket cap head screw is the professional's choice. These DIN912-compliant Allen bolts are machined from 304 stainless steel (18-8, 18% chromium / 8% nickel) and sold in convenient 10-piece sets, making them ideal for prototyping, repair, and small-batch production runs. Available in M3, M4, and M5 diameters with lengths from 8mm to 20mm, each screw features a cylindrical cap head with a precision hex socket recess. The socket depth is optimized for full torque transfer without stripping — critical for CNC frames, 3D printer builds, and robotics assemblies where you're tightening in tight spaces with an Allen key or hex driver bit. 304 stainless steel delivers 500+ hours of salt spray resistance and a working temperature range of -50°C to 400°C (-58°F to 752°F), making these screws equally at home in marine hardware, food-processing equipment, and high-vibration industrial machinery. ✅ DIN912 / ISO 4762 compliant — interchangeable with standard metric hex socket cap screws. Compatible with M3, M4, and M5 tapped holes at standard coarse pitch (0.5 / 0.7 / 0.8mm). ✅ Key Features of These DIN912 Hex Socket Cap Head Screws 🔩 DIN912 / ISO 4762 Certified: Full compliance with international standards — ±0.05mm dimensional tolerance, 8.8 tensile strength grade, and direct interchangeability with ISO 4762 hex socket cap screws. 🛡️ 304 Stainless Steel (18-8): 18% chromium / 8% nickel composition delivers 500+ hours salt spray resistance. Suitable for marine, food-grade, and outdoor applications without surface treatment. 🔧 Precision Hex Socket Recess: Socket depth equals 1.5× screw diameter for maximum torque transfer. Works with standard Allen keys and hex driver bits — no cam-out, no rounding. 📐 Optimized Cap Head Geometry: 1.5× head height-to-diameter ratio with a 90° bearing surface. Provides a large clamping area while keeping the head profile low for space-constrained assemblies. 🌡️ Wide Temperature Range: Rated from -50°C to 400°C (-58°F to 752°F). Maintains mechanical properties in both cryogenic and elevated-temperature environments. 📦 10-Piece Sets per Variant: Each size variant ships as a 10-piece set — enough for a full assembly run or to stock your toolbox without over-ordering. 📐 Technical Specifications Standard DIN912 / ISO 4762 Material 304 Stainless Steel (18-8: 18% Cr / 8% Ni) Drive Style Hex Socket (Allen / Internal Hex) Head Style Cap Head (Cylindrical) Tensile Strength Grade 8.8 equivalent Dimensional Tolerance ±0.05mm Thread Diameters M3, M4, M5 Thread Pitch M3×0.5 / M4×0.7 / M5×0.8 (coarse) Available Lengths 8mm, 12mm, 16mm, 20mm (varies by diameter) Head Diameter M3: 5.5mm / M4: 7.0mm / M5: 8.5mm Socket (Hex Key) Size M3: 2.5mm / M4: 3.0mm / M5: 4.0mm Recommended Torque M3: typically 1.5 Nm / M4: typically 3.2 Nm / M5: typically 6.0 Nm Salt Spray Resistance 500+ hours Working Temperature -50°C to 400°C (-58°F to 752°F) Pack Quantity 10 pieces per variant 🎯 Who Is This For? 🖨️ 3D Printer & CNC Frame Assembly Makers and engineers building or repairing 3D printer frames, CNC router gantries, and linear motion systems rely on DIN912 cap head screws for their low-profile head and high torque capacity in aluminum extrusion T-slots. 🤖 Robotics & Industrial Machinery High-vibration environments demand fasteners that stay put. The hex socket drive and 8.8-grade tensile strength make these the go-to choice for servo mounts, motor brackets, and structural robotics joints. ⚓ Marine & Outdoor Hardware 304 stainless steel's corrosion resistance makes these screws suitable for above-waterline marine fittings, outdoor enclosures, and coastal installations where carbon steel would rust within weeks. 🔬 Lab Equipment & Precision Instruments The ±0.05mm tolerance and non-magnetic 304 stainless steel make these ideal for optical mounts, scientific instrument housings, and laboratory fixtures where dimensional accuracy matters. ❓ Frequently Asked Questions What is the difference between DIN912 and ISO 4762? DIN912 is the German standard for hex socket cap head screws; ISO 4762 is the international equivalent. They are dimensionally identical and fully interchangeable. If your design calls for ISO 4762, these DIN912 screws will fit perfectly. What Allen key size do I need for each screw? M3 screws require a 2.5mm hex key, M4 screws require a 3.0mm hex key, and M5 screws require a 4.0mm hex key. These are standard metric hex key sizes found in most Allen key sets. Are these screws magnetic? 304 stainless steel is generally considered non-magnetic in its annealed state, though it may exhibit slight magnetic response after cold working (machining, forming). For applications requiring strictly non-magnetic fasteners, specify 316L or A4 stainless steel. Can I use these screws in saltwater or marine environments? Yes — 304 stainless steel offers good corrosion resistance in marine environments above the waterline. For submerged or high-chloride applications (e.g., saltwater immersion), 316 stainless steel is recommended for superior pitting resistance. What is the recommended torque for each size? Typical recommended torque values are: M3 — generally 1.5 Nm, M4 — generally 3.2 Nm, M5 — generally 6.0 Nm. Actual torque depends on the mating material, lubrication, and application requirements. Always verify with your engineering specifications. How many screws are included per order? Each variant (size) ships as a 10-piece set. Select your required size (e.g., M3×8mm, M4×12mm) from the dropdown above, and you will receive 10 screws of that exact size. Are these fully threaded or partially threaded? These are fully threaded cap head screws — threads run the full length of the shank from under the head to the tip. This provides maximum grip in through-hole and blind-hole applications across the entire screw length. What materials can these screws be threaded into? These screws work with any pre-tapped metric hole: aluminum, steel, stainless steel, brass, and engineering plastics. They are commonly used with standard metric hex nuts, nylon lock nuts, or threaded inserts in aluminum extrusion profiles. 🛒 Select your size above, then add to cart — 10 pieces per set.
