S-91274A232 5/16"-18 x 5/8" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications
• Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh environments
• Precise Class 3A thread fit delivers secure fastening with minimal vibration loosening in critical assemblies
• High hardness rating (Rockwell C37) maintains thread integrity and drive socket durability through repeated use
• Standard hex drive compatibility with 1/4" tools enables quick installation and removal in confined spaces
• Full threading design allows for maximum adjustability and consistent clamping force along the entire fastener length
• Comprehensive regulatory compliance including RoHS 3 and REACH ensures environmental and safety standards are met

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 5/16"-18 UNC socket head cap screws provide critical solutions for machinery assembly, automotive components, and heavy equipment manufacturing. The zinc-flake-coated alloy steel construction addresses corrosion concerns in outdoor or chemically exposed applications, while the coarse thread design ensures rapid installation and superior resistance to vibration-induced loosening. The fully threaded right-hand configuration combined with Class 3A thread fit guarantees precise engagement in tapped holes, eliminating play and maintaining alignment in precision assemblies. These high-strength cap screws are particularly valuable in applications where space constraints require the compact profile of socket head fasteners while demanding maximum clamping force and durability.

Specification Summary & Compliance

This socket head cap screw features 5/16"-18 UNC coarse threads with Class 3A thread fit for precision engagement. Manufacturing conforms to ASME B18.3 dimensional specifications and ASTM A574 material standards. The product demonstrates compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) chemical regulations. Corrosion resistance validation includes testing per ASTM B117 salt spray standards, ensuring long-term performance in demanding environments.