S-91274A056 8-32 x 1/2" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: Withstands up to 170,000 psi, ensuring reliable performance in high-stress applications without failure.
• Superior Corrosion Resistance: Zinc-flake coating provides robust protection against rust and environmental degradation, extending service life.
• Precision Thread Fit: Class 3A thread ensures tight, secure fastening with minimal backlash, ideal for vibration-prone environments.
• High Hardness & Durability: Rockwell C37 hardness offers excellent wear resistance and maintains integrity under repeated use.
• Wide Compatibility: UNC coarse thread and 9/64" hex drive allow for easy installation with standard tools, reducing assembly time.
• Full Thread Engagement: Fully threaded design maximizes grip strength and distributes load evenly across the entire length.
• Regulatory Compliance: Meets ASME B18.3, ASTM A574, and ASTM B117 standards, ensuring quality and safety in industrial settings.

Professional Applications & Engineering Value

This 8-32 UNC thread socket head cap screw is engineered from zinc-flake-coated alloy steel to address critical challenges in demanding industrial environments. Its coarse thread and Class 3A fit provide secure fastening in materials prone to stripping, while the 170,000 psi tensile strength and Rockwell C37 hardness prevent deformation under heavy loads. The zinc-flake coating offers superior corrosion resistance, making it ideal for outdoor machinery, automotive assemblies, and aerospace components exposed to harsh conditions. Fully threaded for maximum holding power, it ensures reliable performance in high-vibration applications, reducing maintenance needs and downtime. Compliant with key standards, this screw delivers consistent quality for precision engineering projects requiring durability and regulatory adherence.

Specification Summary & Compliance

This screw features precise 8-32 UNC coarse threads with a Class 3A fit for tight tolerances, a 1/2" length, and a 9/64" hex drive for standard tool compatibility. Manufactured in accordance with ASME B18.3 and ASTM A574 specifications, it undergoes ASTM B117 salt spray testing to verify coating durability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for industrial use worldwide.