S-90342A130 1/4"-20 x 1 1/4" Alloy Steel Socket Head Screws with Split Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated split lock washer that maintains clamp force in high-stress applications
• Exceptional tensile strength of 180,000 psi ensures reliable performance under extreme mechanical loads
• Precise Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during installation
• Corrosion-resistant black-oxide finish on both screw and washer extends service life in demanding environments
• Optimized hex drive system with 3/16" drive size delivers maximum torque transfer and prevents tool slippage
• Full UNC coarse threading enables rapid installation and superior holding power in various materials
• Rockwell C39 hardness rating maintains structural integrity and prevents deformation under heavy loads

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws with integrated split lock washers solve critical fastening challenges in industrial applications where vibration loosening compromises assembly integrity. The Class 3A UNC coarse thread specification ensures precise fitment in machinery, automotive components, and heavy equipment, while the 180,000 psi tensile strength provides exceptional load-bearing capacity. The combination of fully threaded design and right-hand thread direction offers uniform stress distribution and compatibility with standard installation tools. Engineered for high-cycle applications, these screws maintain clamp force in vibrating environments where conventional fasteners would require frequent retightening, significantly reducing maintenance downtime and improving operational safety.

Specification Summary & Compliance

This 1/4"-20 x 1-1/4" socket head cap screw features precision Class 3A thread fit with UNC coarse threading (0.25" diameter) and standard hex drive compatibility. Manufactured to exacting standards with Rockwell C39 hardness and 180,000 psi tensile strength. The assembly includes a black-oxide steel split lock washer (0.354" OD, 1/16" thickness) for enhanced locking performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.