S-91864A048 1/4"-28 x 1 1/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A fine thread fit provides superior precision and vibration resistance, ideal for machinery requiring tight tolerances.
• Black-oxide coating on alloy steel enhances corrosion resistance, extending service life in harsh industrial environments.
• Fully threaded design allows for maximum grip and uniform load distribution, improving assembly stability.
• Hex socket drive with 3/16" size enables easy installation in confined spaces with standard tools, boosting efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.
• Rockwell C37 hardness offers excellent durability, minimizing wear and maintenance needs over time.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in precision industries, such as aerospace, automotive, and heavy machinery. The fine UNF threads and Class 3A fit ensure minimal backlash and superior clamping force, preventing loosening under dynamic loads. Made from high-strength alloy steel with a black-oxide surface treatment, it resists corrosion and wear in demanding conditions, reducing downtime and replacement costs. Its fully threaded, 1 1/8" length and hex drive design facilitate quick, secure installations in tight spaces, making it a reliable choice for assemblies requiring exact torque and long-term reliability.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-28 UNF fine thread with Class 3A tolerance for precise fit, and adheres to ASTM A574 manufacturing standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for industrial use.