S-90585A566 1/4"-28 x 3/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional thread precision with Class 3A fit and UNF fine threading ensures secure, vibration-resistant fastening
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Easy installation and removal with 5/32" hex drive providing superior torque transmission
• Full threading coverage along the 3/4" length maximizes grip and distribution of clamping force
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 316 stainless steel flat head screws deliver critical corrosion resistance in chemical processing, marine, and food-grade environments where moisture and corrosive agents are prevalent. The Class 3A thread fit with UNF fine threading provides superior vibration resistance compared to coarse threads, making them ideal for precision machinery, electronic enclosures, and automotive assemblies where loosening under dynamic loads is a concern. The passivated finish enhances surface durability while maintaining the material's inherent corrosion-resistant properties. With full threading along the entire shank, these screws ensure maximum engagement in both thick and thin materials, providing reliable fastening solutions for OEM manufacturing and maintenance applications requiring consistent, high-performance results.

Specification Summary & Compliance

This 1/4"-28 UNF flat head screw features precision Class 3A thread fit with right-hand direction and fine thread spacing. Manufacturing specifications conform to ASME B18.3 standards with dimensional accuracy including head diameter tolerance of -0.051" to 0". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.