S-91251A849 3/4"-10 x 3 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.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Robust 5/8" hex drive allows for high-torque installation with standard tools, facilitating efficient assembly and maintenance.
• Coarse UNRC threads enable quicker installation and better performance in materials prone to stripping or where rapid disassembly is needed.
• Partially threaded design offers optimal grip and clamping force control, ideal for applications requiring precise joint integrity.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties, ensuring dependable performance in critical fastening tasks.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in heavy machinery, automotive, and construction equipment. The Class 3A thread fit and coarse UNRC threads provide superior holding power and ease of installation in high-vibration environments, reducing maintenance downtime. With a Rockwell C37 hardness and 170,000 psi tensile strength, it withstands extreme loads and impacts, making it ideal for critical assemblies where failure is not an option. The partially threaded rod type ensures precise clamping without over-tightening, while the 5/8" hex drive simplifies tool engagement for efficient operations.

Specification Summary & Compliance

This socket head cap screw features a 3/4"-10 UNRC coarse thread with Class 3A fit for high precision, a minimum thread length of 2", and overall length of 3 1/2". It meets ASTM A574 specifications for alloy steel socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use in global markets.