S-90585A146 5/16"-24 x 1" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel and passivated finish, ideal for harsh environments and extended service life
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precision thread fit with Class 3A UNF fine threads ensuring secure, vibration-resistant connections in critical assemblies
• Efficient installation via 3/16" hex drive and standard 82° countersink for flush mounting and reduced assembly time
• Full threading along 1" length provides maximum grip and adjustability in various material thicknesses
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and environmental safety
• Dimensional consistency with controlled head diameter and flat head profile for uniform seating and professional finish

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 316 stainless steel flat head screws deliver outstanding performance in corrosive or high-moisture applications such as marine equipment, chemical processing plants, and food machinery. The passivated finish enhances surface durability, preventing galling and oxidation while maintaining a clean appearance. With a Class 3A UNF fine thread and fully threaded design, they ensure tight, secure fastening in precision assemblies, reducing the risk of loosening under dynamic loads. The 82° countersink and hex drive allow for streamlined installation in countersunk holes, making them ideal for flush-mount applications where aerodynamics or aesthetics are critical. These screws provide long-term reliability, minimizing maintenance and replacement costs in industrial fastening systems.

Specification Summary & Compliance

This 5/16"-24 UNF flat head screw adheres to strict dimensional tolerances, including a head diameter of 0.656" with specified tolerance and a Class 3A thread fit for precision alignment. Manufactured in compliance with ASME B18.3 specifications, it meets mechanical requirements such as 70,000 psi tensile strength and Rockwell B55 hardness. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it is free from hazardous substances and suitable for global industrial and commercial use.