S-91251A542 1/4"-20 x 1" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Fully threaded UNRC coarse design allows for faster installation and stronger holding power across the entire length, ideal for varied material thicknesses.
• Hex socket drive compatibility with a 3/16" drive enables easy access in confined spaces and high-torque application without slippage.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties, ensuring reliability in critical engineering uses.
• RoHS 3 and REACH environmental compliance supports sustainable procurement and safe usage in regulated industries.

Professional Applications & Engineering Value

This 1/4-20 socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in machinery assemblies. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, provides excellent durability and resistance to wear, making it suitable for high-load applications in automotive, aerospace, and heavy equipment. The fully threaded coarse UNRC design ensures quick, secure fastening in materials where fine threads might strip, while the hex drive allows for efficient installation in tight spaces. By meeting ASTM A574 specifications, it delivers consistent performance for precision engineering tasks, reducing maintenance needs and enhancing operational safety.

Specification Summary & Compliance

This product features a 1/4"-20 UNRC coarse thread with a Class 3A thread fit for high precision, and is manufactured in accordance with ASTM A574 standards. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and adherence to global industry requirements for hazardous substance control.