S-91251A474 3/8"-24 x 4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme mechanical loads
• Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Optimized torque transmission through 5/16" hex drive design prevents stripping and enables high clamping forces
• Enhanced durability with Rockwell C37 hardness maintains structural integrity through repeated use cycles
• Regulatory compliance with RoHS 3 and REACH standards ensures environmental responsibility and global market acceptance
• Versatile partial threading allows for both secure fastening and adjustable positioning in complex assemblies

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers critical performance advantages for demanding industrial applications. The 3/8"-24 UNF fine threads with Class 3A fit provide exceptional vibration resistance in machinery, automotive, and heavy equipment where loosening under dynamic loads is a primary concern. The ASTM A574 specification ensures consistent material properties and manufacturing quality, while the black-oxide surface treatment offers superior corrosion protection without dimensional changes that could affect assembly tolerances. The partially threaded design enables precise adjustment in jigs, fixtures, and precision equipment, making it ideal for applications requiring both clamping force and positional accuracy. With 170,000 psi tensile strength, this fastener maintains joint integrity in high-stress environments where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features precision 3/8"-24 UNF fine threads with Class 3A fit for superior thread engagement. Manufactured to ASTM A574 specifications, the fastener delivers consistent mechanical properties including Rockwell C37 hardness and 170,000 psi tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The black-oxide alloy steel construction provides corrosion resistance while maintaining dimensional stability across the 4" length and 9/16" head diameter configuration.