S-91251A937 1 1/4"-7 x 2 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress applications
• Precise torque transmission through 7/8" hex drive design, preventing tool slippage and damage
• Optimized thread engagement with Class 2A coarse UNRC threads for faster assembly and vibration resistance
• Full-threaded design provides consistent clamping force along the entire 2 1/2" length
• Enhanced durability with Rockwell C37 hardness, maintaining structural integrity under repeated loads
• Regulatory compliance with ASTM A574, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical performance in heavy machinery, automotive assemblies, and industrial equipment where vibration resistance and high clamp loads are paramount. The coarse UNRC thread configuration enables rapid installation while maintaining secure fastening in high-vibration environments. With 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners prevent joint failure in structural applications. The black-oxide surface treatment provides essential corrosion protection without compromising dimensional accuracy, while the 7/8" hex drive accommodates standard industrial tools for efficient maintenance and assembly operations.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 2A thread fit tolerance for consistent performance. Features 1 1/4"-7 coarse UNRC right-hand threads and fully threaded 2 1/2" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications worldwide.