S-90585A837 5/8"-11 x 2 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction and passivated finish
• High-reliability fastening with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise, secure thread engagement ensured by Class 3A thread fit and UNC coarse threading
• Efficient installation and removal with 3/8" hex drive and standard flat head profile for flush mounting
• Full-length threading provides consistent grip strength along the entire 2-1/2" length
• Regulatory compliance meets ASME B18.3 specifications and environmental standards (RoHS 3, REACH)
• 82° countersink angle ensures proper seating in standard chamfered holes

Professional Applications & Engineering Value

This 316 stainless steel flat head screw delivers exceptional performance in corrosive and high-stress environments where fastener failure is not an option. The combination of 70,000 psi tensile strength and Class 3A UNC coarse threads provides reliable clamping force in vibration-prone applications, while the passivated finish enhances the natural corrosion resistance of 316 stainless steel. The 3/8" hex drive allows for high-torque installation without cam-out, making these fully threaded screws ideal for structural assemblies, marine equipment, chemical processing systems, and food processing machinery where RoHS 3 and REACH compliance is mandatory.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features 5/8"-11 UNC coarse threads and standard 82° flat head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Dimensions include 1.188" head diameter, 0.324" head height, and 2-1/2" fully threaded length with right-hand threading orientation.