S-91251A239 3/4"-10 x 10 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides consistent engagement and vibration resistance, enhancing assembly integrity and safety.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and disassembly.
• 5/8" hex drive socket head allows for high-torque installation with standard tools, streamlining assembly and reducing labor time.
• Partially threaded design combines unthreaded shank strength with coarse UNRC threads for optimal clamping force and shear resistance.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global industrial standards.

Professional Applications & Engineering Value

Engineered for demanding environments, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses critical challenges in heavy machinery, automotive, and construction sectors. The coarse 3/4"-10 UNRC thread and Class 3A fit prevent loosening under dynamic loads, while the alloy steel construction with 170,000 psi tensile strength handles extreme tension without deformation. Its partially threaded rod design concentrates stress away from the thread roots, reducing fatigue in bolted joints. Ideal for high-torque applications requiring corrosion resistance, the screw's hex drive socket ensures secure fastening in confined spaces, improving assembly efficiency and long-term reliability in industrial fastening systems.

Specification Summary & Compliance

This screw maintains precision Class 3A thread tolerances with a coarse UNRC thread form and 3/4"-10 thread size. It is manufactured to ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets international environmental and safety standards for industrial use.