S-91251A433 3/8"-24 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior thread precision with Class 3A fit provides tighter tolerances and improved vibration resistance, enhancing joint integrity and assembly reliability.
• Black-oxide coating on alloy steel offers excellent corrosion resistance and a durable, non-reflective finish suitable for harsh industrial environments.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, minimizing tool slippage and damage.
• Partially threaded shank enables precise clamping force distribution, ideal for applications requiring secure fastening without thread interference.
• Fine UNF threads deliver enhanced holding power and better adjustment precision compared to coarse threads, perfect for precision machinery.
• Compliance with ASTM A574 and environmental standards (RoHS 3 & REACH) ensures consistent quality and safe use across regulated industries.

Professional Applications & Engineering Value

Engineered for high-performance industrial applications, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses critical challenges in machinery assembly, automotive systems, and heavy equipment. The Class 3A thread fit and fine UNF threading provide superior resistance to loosening under vibration, a common issue in dynamic environments. With a Rockwell C37 hardness and robust 170,000 PSI tensile strength, it withstands extreme loads without deformation, ensuring long-term reliability. The partially threaded design allows for optimal grip in precision components, while the hex drive facilitates efficient installation in tight spaces, reducing assembly time and improving maintenance efficiency.

Specification Summary & Compliance

This screw features a 3/8"-24 UNF fine thread with Class 3A precision fit, ensuring tight tolerances per UNF standards. It is manufactured in accordance with ASTM A574 specifications for high-strength socket head cap screws, guaranteeing consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally safe and sustainable industrial practices.