S-90342A131 1/4"-20 x 1 1/2" Alloy Steel Socket Head Screws with Split Lock Washer

Key Features & Benefits at a Glance

• Exceptional vibration resistance with integrated split lock washer that maintains secure fastening in high-motion environments
• Superior corrosion protection from black-oxide coating on both screw and washer, extending service life in harsh conditions
• Maximum load-bearing capability with 180,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precise thread engagement through Class 3A thread fit ensuring reliable, tight connections with minimal backlash
• Easy installation and removal with standard hex drive (3/16") allowing efficient assembly in confined spaces
• Enhanced durability through fully threaded design that distributes stress evenly along the entire 1-1/2" length
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use across global markets

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers critical engineering solutions where vibration loosening and corrosion compromise fastener integrity. The integrated split lock washer actively counters rotational loosening in machinery, automotive assemblies, and industrial equipment subjected to constant motion. With 180,000 psi tensile strength and Class 3A UNC coarse threads, it maintains clamping force under extreme loads while the black-oxide surface treatment provides reliable corrosion resistance without dimensional changes. The combination of fully threaded design and hex socket drive enables precise torque application in space-constrained applications, making it ideal for precision manufacturing, heavy equipment maintenance, and aerospace assemblies requiring dependable, high-strength fastening solutions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC 1/4"-20 coarse threading for optimal engagement. The fastener system includes matching black-oxide steel split lock washer (0.354" OD, 1/16" thickness) and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. All components meet industrial specifications for socket head cap screws with standardized hex drive (3/16") and fully threaded 1-1/2" length configuration.