S-91251A648 3/8"-16 x 6" 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 critical applications.
• Superior corrosion resistance provided by the black-oxide coating extends service life and maintains integrity in harsh industrial environments.
• Precision Class 3A thread fit guarantees secure, vibration-resistant connections, minimizing loosening and improving assembly reliability.
• Partially threaded design allows for optimal clamping force control, making it ideal for applications requiring precise joint security.
• High hardness (Rockwell C37) enhances wear resistance and durability, ensuring long-term performance with minimal deformation.
• Hex socket drive (5/16") enables easy installation in confined spaces with high torque application, streamlining assembly processes.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting rigorous industry standards.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these Black-Oxide Alloy Steel Socket Head Cap Screws address common challenges like vibration-induced loosening and corrosion in machinery, automotive, and heavy equipment assemblies. The UNC coarse thread and Class 3A fit provide superior engagement in tough materials, reducing installation time while maintaining high clamp load integrity. With a partially threaded shank, they prevent over-tightening and distribute stress evenly, ideal for securing components in high-stress joints. The black-oxide surface treatment not only resists rust but also reduces galling, ensuring smooth fastener operation in repetitive disassembly scenarios. This combination of high tensile strength and precise engineering makes them a go-to solution for applications requiring durability and reliability under dynamic loads.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC coarse thread with Class 3A precision tolerance for consistent fit, a minimum thread length of 1-1/4", and overall length of 6". It meets ASTM A574 specifications for high-strength socket head cap screws, ensuring material and manufacturing consistency. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms adherence to environmental and safety regulations, supporting sustainable procurement practices.