S-91251A129 1/2"-13 x 10" 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 prolongs service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, enhancing joint integrity and safety.
• Partially threaded design allows for effective clamping on specific sections, ideal for applications requiring precise positioning and shear resistance.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive features through repeated use.
• Coarse UNRC threads enable quicker installation and better performance in materials prone to stripping or where debris is present.
• 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 black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors. Its high tensile strength and Rockwell C37 hardness prevent stripping and deformation under dynamic loads, while the coarse UNRC threads facilitate rapid assembly in rugged conditions. The partial threading design concentrates clamping force effectively, reducing stress concentration and improving fatigue resistance. Ideal for industrial socket screw applications requiring reliable fastening in high-vibration environments, it combines durability with regulatory compliance to meet stringent engineering standards and extend equipment lifespan.

Specification Summary & Compliance

This socket head cap screw features a 1/2"-13 thread size with Class 3A fit for precise dimensional accuracy, and adheres to ASTM A574 specifications for consistent quality. It is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. The product meets industrial standards for UNRC coarse threads and partial threading, providing reliable performance in accordance with global engineering requirements.