S-90044A140 5/16"-18 x 2 1/4" 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 industrial applications.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in harsh environments.
• Class 3A thread fit guarantees precise, secure fastening with minimal risk of loosening under vibration.
• Hex socket drive design allows for easy installation and removal with standard tools, reducing assembly time.
• Fully threaded body offers consistent grip along the entire length, ideal for adjustable or deep-set applications.
• Coarse UNRC threads enable quick engagement and are less prone to clogging in dirty or debris-filled conditions.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this socket head cap screw combines black-oxide alloy steel with a Rockwell C37 hardness to withstand heavy loads and resist wear. The fully threaded design and coarse UNRC thread type provide rapid installation and reliable holding power in machinery, automotive assemblies, and construction equipment. Its high tensile strength and corrosion-resistant finish address common failure points like shear stress and environmental exposure, making it a trusted choice for OEMs and maintenance teams seeking durability and compliance with ASTM A574 standards.

Specification Summary & Compliance

This screw features a 5/16"-18 thread size with Class 3A fit for precise tolerance, adhering to UNRC coarse thread standards. It meets ASTM A574 specifications for material and manufacturing quality, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial use.