S-91251A967 1 1/4"-7 x 7 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 under extreme loads, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish prolongs service life and maintains integrity in harsh industrial environments.
• High hardness rating (Rockwell C37) provides excellent wear resistance, minimizing deformation during installation and use.
• 7/8" hex drive design allows for high torque application, ensuring secure fastening and ease of assembly with standard tools.
• Coarse UNRC threads enable quick installation and better grip in softer materials or where vibration resistance is critical.
• Partially threaded shank offers precise clamping force control, ideal for applications requiring specific unthreaded grip lengths.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global regulatory standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening, high-stress fatigue, and environmental corrosion. The coarse UNRC thread and Class 2A thread fit provide reliable engagement in heavy machinery, construction equipment, and automotive assemblies, where rapid installation and durability are paramount. The partially threaded design allows for precise joint clamping, reducing the risk of thread damage in repeated disassembly scenarios. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands dynamic loads and harsh conditions, making it ideal for high-strength bolting applications in manufacturing, mining, and structural frameworks. The black-oxide surface treatment further enhances corrosion resistance, ensuring long-term performance without compromising on ASTM A574 specifications.

Specification Summary & Compliance

This socket head cap screw features a 1 1/4"-7 coarse UNRC thread with Class 2A tolerance for precise fit and easy assembly. It is manufactured in accordance with ASTM A574 standards, ensuring consistent material properties and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use worldwide.