S-91251A161 1"-8 x 10" 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 applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for extended service life.
• 3/4" hex drive and standard socket head allow for high-torque installation with common tools, improving assembly efficiency and reducing strip-out.
• Partially threaded design with 2 1/2" minimum thread length enables precise clamping control and optimal grip in varied material thicknesses.
• Rockwell C37 hardness delivers excellent wear resistance and durability, maintaining integrity under repeated loads.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to rigorous industrial standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high tensile strength and vibration resistance are paramount. The coarse UNRC thread and Class 3A fit facilitate quick, secure fastening in coarse-grained materials, minimizing cross-threading risks. Its partially threaded rod design allows for focused clamping force, reducing stress concentration and improving joint integrity. Ideal for industrial fasteners in assemblies subject to dynamic loads, the screw's Rockwell C37 hardness and robust 10-inch length ensure long-term reliability, while the black-oxide surface treatment provides added protection against rust in harsh environments, supporting maintenance-free operation.

Specification Summary & Compliance

This socket head cap screw features a 1"-8 coarse thread with Class 3A thread fit per UNRC standards, ensuring precise dimensional accuracy. It meets ASTM A574 specifications for high-strength alloy steel fasteners, with a minimum thread length of 2 1/2" and a tensile strength of 170,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for international industrial applications.