S-91274A148 1/4"-20 x 1/4" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-flake coating that provides excellent protection in harsh industrial environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme mechanical loads
• Precision Class 3A thread fit delivers superior engagement and vibration resistance in critical assemblies
• Optimized hex drive system with 3/16" drive size provides secure tool engagement and reduces stripping risk
• Rockwell C37 hardness maintains structural integrity and prevents deformation during installation
• Full thread coverage ensures consistent clamping force distribution across the entire fastener length
• Comprehensive regulatory compliance meets ASME, ASTM, RoHS 3, and REACH standards for global market acceptance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these socket head cap screws deliver exceptional performance where reliability is critical. The zinc-flake-coated alloy steel construction provides superior corrosion resistance in environments exposed to moisture, chemicals, and temperature variations. The 1/4"-20 UNC coarse thread design ensures rapid installation and secure fastening in machinery, automotive assemblies, and heavy equipment. With Class 3A thread fit precision, these screws eliminate play and maintain clamping force in high-vibration applications, reducing maintenance requirements and downtime. The standard socket head profile with 3/16" hex drive allows for high-torque installation in confined spaces, making them ideal for precision equipment and structural frameworks where access is limited.

Specification Summary & Compliance

This socket head cap screw features precise Class 3A thread fit according to UNC standards with 1/4"-20 thread size and right-hand thread direction. Manufactured to ASME B18.3 specifications with material compliance to ASTM A574 for alloy steel and ASTM B117 for corrosion testing. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. Dimensions include 1/4" length, 3/8" head diameter, and 1/4" head height for consistent performance across industrial applications.