S-91251A738 1/2"-13 x 7" 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 prolongs service life in demanding industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies.
• 3/8" hex drive design allows for easy installation and high torque application with standard tools.
• Partially threaded shank offers optimal grip and alignment, ideal for clamping materials without thread interference.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties for engineering applications.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for 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. The UNRC coarse thread and Class 3A fit deliver superior resistance to loosening under vibration, while the high tensile strength and Rockwell C37 hardness prevent stripping and deformation. The partially threaded design ensures precise clamping force distribution, reducing stress concentration. Ideal for industrial applications requiring robust fastening solutions, it combines durability with regulatory compliance, supporting efficient assembly and long-term reliability.

Specification Summary & Compliance

This screw adheres to ASTM A574 specifications, with a Class 3A thread fit for high precision and UNRC coarse thread standards. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental and safety regulations are satisfied for industrial use.