S-91251A737 1/2"-13 x 6 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 applications, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel provides corrosion resistance and a durable finish, extending service life in harsh industrial environments.
• Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in machinery assemblies.
• Partially threaded design allows for controlled clamping force and easier alignment in structural and equipment applications.
• 3/8" hex drive socket head enables high-torque installation with standard tools, minimizing stripping and improving assembly efficiency.
• Coarse UNRC threads facilitate quick engagement and reduce cross-threading risks, speeding up production and maintenance tasks.
• Rockwell C37 hardness ensures high wear resistance and durability, maintaining integrity under repeated loads.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery, automotive, and construction equipment. The alloy steel construction, combined with a black-oxide surface treatment, resists corrosion and wear, making it ideal for environments exposed to moisture, chemicals, or high friction. With a coarse UNRC thread and Class 3A fit, it ensures rapid, secure fastening that withstands vibrations and dynamic loads, reducing maintenance downtime. The partially threaded rod design provides optimal grip in bolted joints, preventing loosening and enhancing safety in structural applications. By meeting rigorous standards like ASTM A574, it delivers consistent quality and reliability for engineers and procurement specialists seeking durable socket head screws that minimize replacement costs and improve operational efficiency.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNRC coarse threads with a size of 1/2"-13. It is manufactured in compliance with ASTM A574 specifications, ensuring high strength and consistency. Additionally, it meets environmental and safety regulations, being RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting sustainable and safe industrial use.