S-91864A002 0-80 x 5/16" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Exceptional tensile strength (170,000 psi) ensures reliable performance under high-stress conditions, reducing failure risks.
• Precise Class 3A thread fit provides tight, secure fastening with minimal backlash for vibration-resistant assemblies.
• Fine UNF threads offer improved load distribution and superior holding power in precision components.
• Fully threaded design allows for consistent clamping force along the entire length, enhancing joint integrity.
• Hex socket drive (0.050") enables high-torque installation with standard tools, reducing stripping and improving efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered for precision applications where reliability and strength are critical. The Class 3A UNF fine thread design delivers superior resistance to loosening under vibration, making it ideal for aerospace, automotive, and electronic assemblies. The fully threaded rod type ensures uniform stress distribution, while the Rockwell C37 hardness and high tensile strength prevent deformation in high-load scenarios. Its hex drive style facilitates secure installation in confined spaces, reducing assembly time and improving maintenance efficiency in industrial fastener systems.

Specification Summary & Compliance

This screw features a 0-80 UNF fine thread with Class 3A fit for precise tolerance, a length of 5/16", and a drive size of 0.050". It complies with ASTM A574 specifications for alloy steel socket head cap screws and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring material safety and regulatory adherence.