S-91274A172 1/4"-20 x 1" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-flake coating that provides superior protection in harsh industrial environments
• Maximum thread engagement and holding power through fully threaded UNC coarse thread design for reliable fastening performance
• Premium strength characteristics with 170,000 psi tensile strength and Rockwell C37 hardness for heavy-duty applications
• Precise Class 3A thread fit ensuring tight tolerances and consistent performance in critical assemblies
• Optimized hex drive system with 3/16" drive size providing secure tool engagement and reduced cam-out risk
• Comprehensive compliance coverage meeting ASME B18.3, ASTM A574, and ASTM B117 standards for quality assurance
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

These zinc-flake-coated alloy steel socket head cap screws deliver exceptional performance in demanding industrial environments where corrosion resistance and high tensile strength are critical. The Class 3A thread fit provides superior precision for machinery, automotive, and aerospace applications where vibration resistance and reliable clamping force are essential. The fully threaded UNC coarse thread design ensures maximum engagement in both soft and hard materials, while the hex socket drive allows for high torque application in confined spaces. Engineered to withstand extreme conditions, these fasteners solve common industrial challenges including joint integrity maintenance, corrosion-induced failure prevention, and assembly efficiency optimization in high-stress applications.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread specifications (1/4"-20 thread size). Complies with ASME B18.3 dimensional standards, ASTM A574 material specifications, and ASTM B117 salt spray testing requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for restricted substances. The zinc-flake coating provides enhanced corrosion protection while maintaining the high-strength characteristics required for critical industrial applications.