S-90585A596 5/16"-18 x 3" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction with passivated finish
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
• Full UNC coarse threading provides maximum holding power and faster installation in various materials
• Standard 82° countersink angle allows for flush mounting in prepared holes without protrusion
• Hex drive design (3/16") enables high-torque installation with standard tools while preventing cam-out
• Comprehensive compliance with ASME B18.3, RoHS 3, and REACH ensures regulatory acceptance for industrial use

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver exceptional performance in corrosive environments where standard fasteners fail. The passivated finish creates an enhanced protective oxide layer, making them ideal for marine, chemical processing, and food industry applications where moisture and chemicals are present. The Class 3A UNC coarse thread provides superior resistance to vibration loosening while enabling quick assembly in various substrates. With full threading along the 3-inch length, these screws distribute clamping force evenly, preventing stress concentration. The flat head design with 82° countersink ensures smooth, flush surfaces in machinery, equipment frames, and structural components where protrusion isn't acceptable. These industrial-grade fasteners meet the rigorous demands of ASME B18.3 standards for dimensional consistency and mechanical properties.

Specification Summary & Compliance

Manufactured to precise dimensional tolerances including Class 3A thread fit for superior engagement and head diameter tolerance of -0.056" to 0". Thread specifications include 5/16"-18 UNC coarse spacing with right-hand orientation. Complies with ASME B18.3 manufacturing standards for socket cap screws. Meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations for chemical safety. The fully threaded design and standard flat head profile ensure consistent performance across industrial applications.