S-91251A036 1 1/2"-6 x 6 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi for reliable performance in high-stress and heavy-duty applications
• Superior corrosion resistance provided by the black-oxide finish, extending service life in demanding industrial environments
• High hardness rating of Rockwell C37 ensures excellent wear resistance and durability under repeated use
• Precise Class 2A thread fit for smooth assembly and secure fastening with reduced risk of cross-threading
• Versatile hex drive design with 1" drive size allows for high torque application and easy installation in confined spaces
• Optimized partial threading provides maximum grip strength where needed while reducing material and weight
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring environmental safety and global market acceptance

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical performance advantages in demanding engineering applications. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes them ideal for heavy machinery, automotive assemblies, and industrial equipment where vibration resistance and structural integrity are paramount. The coarse UNRC thread design ensures rapid installation and superior holding power in softer materials or where frequent disassembly is required. The black-oxide surface treatment provides essential corrosion protection without compromising dimensional accuracy, while the hex socket drive enables high-torque tightening in space-constrained applications. These partially threaded fasteners offer precise clamping force control, making them particularly valuable in precision manufacturing and assembly operations where consistent performance is critical.

Specification Summary & Compliance

Manufactured to exacting ASTM A574 specifications, these socket head cap screws feature Class 2A thread fit tolerances for consistent performance. The 1½"-6 UNRC coarse thread configuration ensures reliable engagement, while the partially threaded design provides optimal fastening efficiency. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and global market suitability. All dimensional specifications including the 2¼" head diameter and 6½" overall length maintain precision within inch system requirements for industrial applications.