A2 70 Black Stainless Steel Hexagonal Socket Screw

The A2 70 Black Stainless Steel Hexagonal Socket Screw combines corrosion resistance with high-torque performance, ideal for applications demanding durability in harsh environments. Machined from A2 (304) stainless steel and heat-treated to meet the 70 MPa tensile strength grade, these screws feature a hexagonal socket drive (Allen key) for secure, flush-mounted installation. The black oxide or electroplated finish enhances corrosion resistance while reducing light reflection—critical in marine, automotive, or outdoor equipment where aesthetics and low visibility matter. Available in sizes M3 to M10 with full threading, they conform to DIN 912 and ISO 4762 standards, ensuring precise thread geometry (UNC/UNF) for uniform load distribution in assemblies like hydraulic systems, machinery housings, or structural frameworks.

The Grade 12.9 carbon steel variant (black-coated) offers ultra-high tensile strength for extreme load scenarios, such as securing heavy-duty engine components or industrial presses. Full-threaded shanks maximize grip in soft or brittle materials, while the hex socket design prevents cam-out during tightening, even under vibration. Customization options include alternative coatings (e.g., PTFE for chemical resistance) or modified thread pitches to match legacy equipment. Whether used in saltwater-exposed offshore rigs or precision robotics, these screws balance stainless steel’s inertness with the mechanical reliability of high-grade alloys, making them a versatile choice for engineers prioritizing longevity, torque integrity, and clean installation profiles.