S-91251A410 6-40 x 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: Withstands up to 170,000 psi for reliable performance in high-stress applications.
• Precision Class 3A Thread Fit: Ensures tight, secure fastening with minimal backlash in assemblies requiring fine thread accuracy.
• Corrosion-Resistant Black-Oxide Finish: Provides enhanced durability and protection against rust in harsh industrial environments.
• High Hardness Alloy Steel Construction: Rockwell C37 rating offers superior wear resistance and long-term fastener integrity.
• Hex Socket Drive Design: Allows for easy installation and removal with standard 7/64" hex tools, reducing assembly time.
• Fully Threaded Body: Enables consistent clamping force along the entire 1/2" length for versatile mounting applications.
• Compliant with Industry Standards: Meets ASTM A574 specifications and environmental regulations like RoHS 3 and REACH for global usability.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in precision machinery, automotive, and aerospace assemblies where vibration resistance and thread accuracy are paramount. The 6-40 UNF fine thread with Class 3A fit minimizes loosening under dynamic loads, while the high tensile strength (170,000 psi) ensures joint integrity in high-pressure environments. The hex drive and standardized socket head profile facilitate quick maintenance and reduce tool slippage, enhancing operational efficiency. Ideal for securing components in confined spaces, this fastener delivers reliable performance in applications demanding fine thread precision and corrosion protection, supported by compliance with ASTM A574 and environmental directives.

Specification Summary & Compliance

This socket head cap screw features a 6-40 UNF fine thread with Class 3A thread fit for precise engagement, a length of 1/2", and a fully threaded design. It is manufactured from alloy steel with a black-oxide surface treatment and meets ASTM A574 specifications for quality assurance. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances for safe use in industrial and electronic applications.