S-91274A508 1/2"-13 x 6" 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 under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the zinc-flake coating protects against harsh industrial environments, extending service life and reducing maintenance needs.
• High-precision Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening in dynamic operations.
• Partially threaded design allows for precise clamping force on specific sections, ideal for applications requiring controlled grip range.
• Robust Rockwell C37 hardness offers excellent wear resistance, maintaining structural integrity through repeated use and high-stress conditions.
• 3/8" hex drive compatibility enables easy installation with standard tools, streamlining assembly processes and reducing labor time.
• Compliance with ASME B18.3 and ASTM A574 standards guarantees consistent quality, dimensional accuracy, and material reliability for engineering peace of mind.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this Socket Head Cap Screw combines zinc-flake-coated alloy steel with a 1/2"-13 UNC coarse thread to address common challenges like vibration-induced loosening and environmental degradation. The partially threaded configuration ensures optimal load distribution in machinery, automotive, and heavy equipment assemblies, where precise clamping is critical. Its high tensile strength and Rockwell C37 hardness resist deformation under stress, making it suitable for structural frames, hydraulic systems, and precision tooling. The corrosion-resistant coating further enhances durability in outdoor or chemically exposed environments, reducing downtime and replacement costs while meeting rigorous industry standards.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit per ASME B18.3 for precise dimensional control, with UNC coarse threads and a right-hand thread direction. Manufactured in compliance with ASTM A574 for material consistency, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe, sustainable use in global markets.