S-91274A432 1/2"-13 x 5/8" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion protection with zinc-flake coating that extends service life in harsh industrial environments
• Exceptional tensile strength rated at 170,000 PSI for reliable performance in high-stress applications
• Precision Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
• Rockwell C37 hardness provides excellent wear resistance and durability under repeated use
• Standard hex socket drive allows for easy installation with common 3/8" drive tools
• Coarse UNC threading enables quick assembly and disassembly while maintaining holding power
• Full compliance with industry standards including ASME B18.3 and ASTM A574 for guaranteed quality

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these socket head cap screws deliver exceptional performance where reliability matters most. The zinc-flake-coated alloy steel construction provides superior corrosion resistance compared to conventional coatings, making these fasteners ideal for machinery, automotive, and manufacturing equipment exposed to challenging environments. The 1/2"-13 UNC coarse thread design ensures rapid installation while maintaining strong clamping force, significantly reducing assembly time in production lines. With their 170,000 PSI tensile strength and Rockwell C37 hardness, these screws withstand extreme mechanical stresses and vibration, preventing joint failure in critical applications. The 3/8" hex drive offers excellent torque transmission without stripping, while the fully threaded design provides consistent engagement throughout the entire fastener length.

Specification Summary & Compliance

This socket head cap screw features precision Class 3A thread fit per UNC standards with 1/2"-13 coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.3 dimensional specifications and ASTM A574 material requirements. 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. Additional specifications include standard socket head profile, 3/4" head diameter, 1/2" head height, and 5/8" overall length.