S-91251A778 1 3/8"-6 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 industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding environments.
• Precision Class 2A thread fit allows for easy assembly and consistent engagement, minimizing cross-threading and improving installation efficiency.
• Heavy-duty hex drive design with a 1" drive size provides secure tool engagement and high torque transmission without stripping.
• Coarse UNC threads offer faster installation and better resistance to vibration loosening compared to fine threads.
• Partially threaded shank concentrates strength where needed and allows for precise clamping force control in assembled components.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This 1 3/8"-6 UNC Socket Head Cap Screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration resistance and high clamp load are paramount. The black-oxide alloy steel construction combats rust and wear, while the coarse thread design ensures rapid installation and stability under dynamic loads. With a 10" length and partially threaded rod, it provides optimal grip in thick materials, reducing the need for additional fasteners. Ideal for securing large structural components, this screw's hex drive and standard socket head enable easy access in confined spaces, streamlining maintenance and reducing downtime in industrial settings.

Specification Summary & Compliance

This socket head cap screw features a 1 3/8"-6 UNC coarse thread with Class 2A fit for precise dimensional accuracy, ensuring compatibility with standard nuts and tapped holes. It adheres to ASTM A574 specifications for high-strength alloy steel fasteners, providing consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for use in various industries.