S-91274A236 5/16"-18 x 3/4" 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 provides superior resistance to mechanical loads and prevents failure in demanding applications.
• High Rockwell C37 hardness ensures excellent wear resistance and maintains structural integrity under repeated stress.
• Zinc-flake coating offers superior corrosion protection, extending service life even in harsh industrial environments.
• Precision Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening.
• 1/4" hex drive socket head allows for high-torque installation and removal in confined spaces with standard tools.
• Fully threaded right-hand UNC coarse thread design enables quick assembly and provides maximum grip length.
• Compliance with ASME B18.3 and ASTM A574 standards ensures consistent quality, dimensional accuracy, and reliable performance.

Professional Applications & Engineering Value

This 5/16"-18 UNC Socket Head Cap Screw is engineered for high-stress applications where reliability is non-negotiable. The zinc-flake-coated alloy steel construction combats corrosion effectively, making it ideal for machinery, automotive assemblies, and heavy equipment exposed to moisture or chemicals. Its coarse thread and Class 3A fit provide excellent holding power in metals and plastics, reducing the risk of strip-out. The socket head design with a 1/4" hex drive facilitates easy installation in tight spaces, streamlining maintenance and assembly processes. By meeting rigorous standards, this screw delivers consistent performance, minimizing downtime and enhancing the longevity of your industrial projects.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with a Class 3A fit for precise thread engagement. It complies with ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and material consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial and commercial applications without hazardous substances.