S-91251A435 1/4"-28 x 3/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coating, extending service life in harsh industrial environments.
• Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress applications without failure.
• Precision Class 3A thread fit guarantees tight, secure fastening with minimal backlash in critical assemblies.
• Fully threaded design provides consistent engagement along the entire length for uniform load distribution.
• Fine thread spacing (UNF) offers enhanced vibration resistance and improved adjustment accuracy.
• Hex socket drive (3/16") allows for high-torque installation in confined spaces with standard tools.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses common challenges like vibration loosening and corrosion in machinery, automotive, and aerospace assemblies. The fine UNF threads and Class 3A fit deliver precise alignment and superior clamping force, reducing maintenance needs. With a Rockwell C37 hardness and 170,000 PSI tensile strength, it withstands extreme loads while the fully threaded rod ensures even stress distribution. Ideal for high-torque applications using a 3/16" hex drive, it simplifies installation in tight spaces, enhancing efficiency in production lines and equipment repair.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF thread with Class 3A tolerance for high precision, fine thread spacing, and a 3/8" length. Manufactured to ASTM A574 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety, ensuring reliability in regulated industries.