S-90044A212 1 1/4"-7 x 3 3/4" 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, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel provides corrosion resistance and a durable finish, extending service life in demanding environments.
• Class 2A thread fit with UNC coarse threading offers easier assembly and better resistance to vibration loosening compared to fine threads.
• 7/8" hex drive and standard socket head allow for high torque application with common tools, speeding up installation and maintenance.
• Partially threaded design provides unthreaded shank for precise clamping without thread damage, ideal for aligned components.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chain use.
• Rockwell C37 hardness balances toughness and machinability, preventing brittleness while maintaining durability under load.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, automotive assembly, and structural frameworks where vibration resistance and high clamp load are paramount. The UNC coarse thread facilitates quick installation in tough materials, reducing assembly time, while the partially threaded rod ensures accurate positioning without thread galling. With a 1 1/4"-7 thread size and 3 3/4" length, it accommodates thick sections in construction and manufacturing, providing a secure fit that withstands dynamic stresses. The hex drive style and robust head diameter enable efficient torque transfer, minimizing tool slippage and enhancing worker safety in industrial settings.

Specification Summary & Compliance

This socket head cap screw adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy for consistent engagement. It meets ASTM A574 specifications for high-strength alloy steel fasteners, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances for safe industrial use.