S-91251A935 1"-8 x 12" 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 demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• High torque capability with the 3/4" hex drive and standard socket head profile, allowing for easy installation and removal with common tools.
• Optimized for heavy-duty use thanks to Rockwell C37 hardness, offering excellent wear resistance and durability.
• Versatile partial threading on a 12" length enables flexible clamping and adjustment in machinery and structural setups.
• Broad compliance with ASTM A574, RoHS 3, and REACH ensures safety, environmental responsibility, and interoperability in global supply chains.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors. Its 1"-8 coarse UNRC thread and Class 3A fit deliver superior clamping force and vibration resistance, preventing joint failure in high-stress environments. The partially threaded design allows for precise load distribution, ideal for securing large components where full threading isn't necessary. With a 170,000 psi tensile strength and corrosion-resistant finish, it outperforms standard fasteners in abrasive or humid conditions, reducing maintenance downtime and ensuring long-term reliability. This screw is a go-to solution for engineers seeking durability and compliance in industrial fasteners.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for accuracy and a 1"-8 coarse UNRC thread with right-hand direction. It meets ASTM A574 specifications for high-strength alloy steel fasteners, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental suitability for global industrial use.