316 Stainless Steel (A4) DIN 912 Metric Socket Head Cap Screws When you need maximum strength, precise fit, and corrosion resistance, DIN 912 Socket Head Cap Screws are the industry standard. These fasteners feature a cylindrical head with an internal hex or Allen socket drive, allowing very high tightening torque in compact spaces. These fasteners are also commonly referred to as socket head machine screws, which accurately describes their function. These machine screws are designed for use in tapped holes or with nuts in mechanical, structural, and marine assemblies. They come either fully threaded or partially threaded depending on the diameter and length you choose. Scroll down for a table that defines thread lengths for each size fastener. Our DIN 912 socket head cap screws are manufactured from A4 grade 316 stainless steel, making them ideal for saltwater, coastal, and harsh environments where corrosion resistance is critical. The tall cylindrical head and deep Allen or socket hex drive provide superior engagement with the tool, making these screws ideal for high load and high vibration applications such as: Marine hardware and deck fittings Engines and mechanical systems Machinery and equipment frames Automotive and motorsport assemblies Industrial and structural applications Aluminum, steel, and composite structures The socket drive allows high torque without damaging the head, making DIN 912 screws a favorite in precision mechanical assemblies. Why DIN 912 Matters DIN 912 defines the head diameter, head height, socket size, and thread geometry so that these socket head cap screws fit and perform consistently across all sizes. These are not generic Allen screws. They are precision metric machine screws designed to deliver predictable clamping force and proper fit with metric tools and threads. Using true DIN 912 fasteners prevents rounding, thread damage, and uneven load that can occur with low tolerance hardware. Material: A4 / 316 Stainless Steel These screws are made from A4 stainless steel, also known as 316, the preferred alloy for corrosive and saltwater environments. Outstanding resistance to rust and pitting Highly resistant to saltwater and chlorides Strong and durable under load Long service life outdoors and in wet environments Non-magnetic in most conditions This is the same stainless used in marine fittings, fasteners, and offshore hardware, and it far outperforms A2 stainless in coastal exposure.When paired with our A4 stainless metric hardware, these socket head machine screws deliver a corrosion resistant fastening system that provides strength, precision, and long term reliability in demanding environments. Size Thread/mm Length Head Diameter Head Height Thread Length M4 0.7 5mm 7mm 4mm Fully Threaded M4 0.7 10mm 7mm 4mm Fully Threaded M4 0.7 16mm 7mm 4mm Fully Threaded M4 0.7 20mm 7mm 4mm Fully Threaded M4 0.7 30mm 7mm 4mm 20.5mm M4 0.7 50mm 7mm 4mm 21.7mm M5 0.8 10mm 8.55mm 5mm Fully Threaded M5 0.8 16mm 8.55mm 5mm Fully Threaded M5 0.8 20mm 8.55mm 5mm Fully Threaded M5 0.8 40mm 8.55mm 5mm 24mm M5 0.8 50mm 8.55mm 5mm 24mm M5 0.8 60mm 8.55mm 5mm 22mm M6 1.0 10mm 9.9mm 5.9mm Fully Threaded M6 1.0 16mm 9.9mm 5.9mm Fully Threaded M6 1.0 20mm 9.9mm 5.9mm Fully Threaded M6 1.0 30mm 9.9mm 5.9mm Fully Threaded M6 1.0 40mm 9.9mm 5.9mm 25mm M6 1.0 60mm 9.9mm 5.9mm 25mm M6 1.0 80mm 9.9mm 5.9mm 25mm M6 1.0 100mm 9.9mm 5.9mm 25mm M8 1.25 16mm 12.85mm 8mm Fully Threaded M8 1.25 20mm 12.85mm 8mm Fully Threaded M8 1.25 30mm 12.85mm 8mm Fully Threaded M8 1.25 40mm 12.85mm 8mm 29mm M8 1.25 50mm 12.85mm 8mm 29mm M8 1.25 60mm 12.85mm 8mm 29mm M8 1.25 100mm 12.85mm 8mm 29mm M10 1.5 20mm 15.9mm 9.85mm Fully Threaded M10 1.5 30mm 15.9mm 9.85mm Fully Threaded M10 1.5 40mm 15.9mm 9.85mm Fully Threaded M10 1.5 50mm 15.9mm 9.85mm 33.75mm M10 1.5 60mm 15.9mm 9.85mm 33.75mm M10 1.5 80mm 15.9mm 9.85mm 35.5mm M10 1.5 100mm 15.9mm 9.85mm 34.5mm M12 1.75 20mm 17.85mm 12mm Fully Threaded M12 1.75 30mm 17.85mm 12mm Fully Threaded M12 1.75 40mm 17.85mm 12mm Fully Threaded M12 1.75 60mm 17.85mm 12mm 37.5mm M12 1.75 80mm 17.85mm 12mm 37.5mm M12 1.75 120mm 17.85mm 12mm 36.5mm M16 2.0 30mm 23.75mm 16mm Fully Threaded M16 2.0 40mm 23.75mm 16mm Fully Threaded M16 2.0 60mm 23.75mm 16mm Fully Threaded M16 2.0 80mm 23.75mm 16mm
