S-90342A126 1/4"-20 x 3/8" Alloy Steel Socket Head Screws with Split Lock Washer

Key Features & Benefits at a Glance

• Vibration-resistant performance with integrated split lock washer that maintains clamping force under dynamic loads
• Exceptional tensile strength rated at 180,000 PSI for heavy-duty applications requiring reliable fastening
• Superior corrosion protection through black-oxide coating on both screw and washer for extended service life
• Precise thread engagement with Class 3A fit ensuring consistent, reliable assembly in demanding environments
• Optimized drive efficiency featuring hex socket design for high torque application and reduced stripping risk
• Enhanced material durability with Rockwell C39 hardness providing excellent wear resistance
• Regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw with integrated split lock washer addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and heavy equipment. The Class 3A thread fit combined with UNC coarse threading ensures rapid assembly and disassembly while maintaining precision alignment in high-stress applications. The 180,000 PSI tensile strength and Rockwell C39 hardness provide reliable performance in environments subject to shock loads and cyclic stresses. The hex drive socket design allows for confined space installation while the fully threaded configuration offers maximum grip length for secure fastening in critical joints.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC 1/4-20 coarse threading. The fastener system includes matching black-oxide steel split lock washer with 0.354" OD and 1/16" thickness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental and safety standards in industrial applications.