Flat Socket Head Screw-304 Stainless Steel 18-18 -Countersunk Bolt

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1.High-Performance Design – Precision-machined from 18-8 (A2/304) stainless steel, these flat socket head screws offer ≈ 70 ksi / 480 MPa minimum tensile strength and outstanding resistance to rain-water, salt-spray, mild chemicals, and food acids. The 82° (metric 90°) countersunk head sits perfectly flush with the surface, delivering a smooth, snag-free finish while maintaining robust clamping force under vibration or thermal cycling from −196 °C to +425 °C.

2. Versatile Application Range – Preferred in sheet-metal enclosures, CNC machinery, aerospace and automotive body panels, marine hardware, electronics chassis, architectural façades, and high-end furniture—any assembly that needs a flush, low-profile fastener combined with long-term corrosion protection.

3.Easy to Install – The deep internal hex drive accepts standard Allen keys or power bits for one-handed installation in tight spots and transmits high torque without cam-out. The countersunk head self-centres in pre-formed 82°/90° chamfers, ensuring precise alignment and eliminating secondary finishing. Rolled UNC or metric threads run smoothly, and the passivated surface lowers friction, reducing the risk of galling.

4.Proven Quality Assurance – Manufactured under ISO 9001 quality systems and conforming to ASME B18.3 / ISO 10642 dimensional standards plus ISO 3506-1 mechanical requirements. Each production lot is thread-gauge verified, hardness and tensile tested, magnetic-particle inspected, and passivated for maximum corrosion resistance; EN 10204 3.1 material certificates and full heat-lot traceability are available on request, guaranteeing dependable, long-service performance in demanding environments.