S-91251A377 3/4"-10 x 5 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 and vibrations in demanding industrial applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and reducing maintenance in harsh environments.
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening in critical assemblies.
• High Rockwell C37 hardness provides excellent wear resistance, maintaining thread integrity and drive engagement through repeated use.
• 5/8" hex drive design allows for high-torque installation with standard tools, facilitating efficient assembly and disassembly.
• Coarse UNC thread profile enables quick installation and superior grip in a wide range of materials, reducing assembly time.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance for industrial projects.

Professional Applications & Engineering Value

This 3/4"-10 UNC Socket Head Cap Screw is engineered for high-stress applications where reliability is non-negotiable. The black-oxide alloy steel construction offers enhanced corrosion protection, making it ideal for machinery, heavy equipment, and structural assemblies exposed to moisture or chemicals. The Class 3A thread fit and coarse UNC thread provide superior resistance to vibrational loosening, a common failure point in dynamic systems. With a minimum thread length of 2 inches and partial threading, it allows for precise clamping force distribution, reducing stress concentration. These features collectively solve critical engineering challenges like joint integrity, durability under cyclic loading, and compliance with international standards, ensuring long-term operational safety in sectors like automotive, construction, and industrial manufacturing.

Specification Summary & Compliance

This socket head cap screw adheres to UNC coarse thread standards with a Class 3A thread fit for high precision. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent material and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environmentally sensitive and global markets. Dimensions include a 5 3/4" length, 5/8" hex drive, and right-hand thread direction, providing reliable performance in accordance with industrial fastener standards.