S-91251A860 3/4"-10 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 under extreme loads and vibrations in demanding industrial environments.
• Superior corrosion resistance from the Black-Oxide finish prolongs service life and reduces maintenance needs in harsh or outdoor applications.
• Precise Class 3A thread fit guarantees secure, tight fastening with minimal risk of loosening, ideal for critical assembly operations.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity and drive engagement over repeated use.
• 5/8" hex drive design allows for high-torque installation with standard tools, enabling efficient assembly and disassembly.
• Partially threaded shank offers optimal clamping force distribution, preventing joint slippage in structural applications.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality, environmental safety, and global regulatory acceptance for your projects.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as joint failure, corrosion-induced degradation, and assembly inefficiency. The UNRC coarse thread and Class 3A fit provide rapid installation and vibration resistance in heavy machinery, construction equipment, and automotive systems. Its high tensile strength and Rockwell C37 hardness ensure durability under dynamic loads, while the Black-Oxide surface treatment offers enhanced protection against rust and chemical exposure. Ideal for applications requiring reliable partially threaded fasteners, this screw minimizes downtime and maintenance costs in industrial settings where precision and longevity are critical.

Specification Summary & Compliance

This socket head cap screw features a 3/4"-10 UNRC coarse thread with Class 3A thread fit for precise dimensional accuracy. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for hazardous substances.