S-91251A618 3/8"-24 x 1/2" 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.
• Corrosion-resistant black-oxide finish on alloy steel enhances durability and longevity in harsh industrial environments.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening over time.
• Fine UNF thread design offers improved load distribution and secure fastening in precision assemblies.
• Hex socket drive allows for high-torque installation with standard tools, facilitating efficient assembly and maintenance.
• Full threading along the entire length ensures maximum grip and adjustability in various mounting scenarios.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in demanding industrial settings. The 3/8"-24 UNF fine thread with Class 3A precision ensures tight, reliable fastening in applications where vibration resistance and exact alignment are paramount, such as machinery, automotive systems, and precision equipment. The alloy steel construction combined with a black-oxide surface treatment provides excellent corrosion resistance, extending service life in humid or chemically aggressive environments. With a high tensile strength of 170,000 psi and Rockwell C37 hardness, it withstands heavy loads and repetitive stress, reducing maintenance downtime and enhancing operational reliability. Ideal for industrial fastening in aerospace, manufacturing, and heavy equipment, this screw delivers consistent performance where safety and durability are non-negotiable.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-24 UNF fine thread with Class 3A thread fit for precise tolerance, ensuring secure and accurate assembly. It is manufactured in accordance with ASTM A574 specifications, guaranteeing material integrity and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and health safety standards for use in various international markets.