S-91251A846 3/4"-10 x 2 3/4" 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, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the black-oxide finish extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and high-stress conditions.
• 5/8" hex drive design allows for high torque application with standard tools, facilitating efficient installation and removal.
• Fully threaded body ensures consistent clamping force along the entire length, ideal for adjustable or deep-set applications.
• Compliance with RoHS 3 and REACH guarantees environmental safety and regulatory acceptance for global industrial supply chains.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common challenges in heavy-duty machinery, automotive, and construction sectors where vibration resistance and long-term durability are critical. The coarse UNRC thread and Class 3A fit provide superior grip in soft materials or high-vibration environments, preventing thread stripping and ensuring stable connections. Its alloy steel construction combined with a black-oxide surface treatment resists rust and wear, making it suitable for outdoor or corrosive settings. The fully threaded design allows for versatile positioning and uniform stress distribution, reducing the risk of joint failure in dynamic loads. Ideal for high-strength fastening in frames, engines, and structural assemblies, this screw delivers consistent performance where reliability cannot be compromised.

Specification Summary & Compliance

This socket head cap screw features a 3/4"-10 coarse thread with Class 3A fit per UNRC standards, ensuring precise dimensional accuracy and interchangeability. It meets ASTM A574 specifications for high-strength alloy steel fasteners, guaranteeing material consistency and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing and use in industrial applications worldwide.