S-96909A406 4-40 x 1/4" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Split Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated 410 stainless steel split lock washer that maintains clamping force under dynamic loads
• Exceptional corrosion resistance through 18-8 stainless steel construction and passivated finish for harsh industrial environments
• High-strength performance delivering 80,000 psi tensile strength and Rockwell B85 hardness for demanding applications
• Reliable fastening efficiency with fully threaded 4-40 UNC coarse thread design ensuring maximum engagement and holding power
• Easy installation and removal using standard Phillips No. 1 drive system compatible with common industrial tools
• Industry-standard compliance meeting ASME B18.13 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

These 4-40 UNC rounded head Phillips screws with integrated split lock washers solve critical vibration-induced loosening problems in industrial assemblies. The combination of 18-8 stainless steel material and passivated finish provides exceptional corrosion resistance for harsh environments including marine, chemical processing, and outdoor equipment. The fully threaded coarse pitch design ensures maximum thread engagement while the 410 stainless steel lock washer maintains constant tension under thermal cycling and dynamic loads. These industrial screws deliver reliable performance in machinery, electronic enclosures, automotive components, and precision instruments where vibration resistance and corrosion protection are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.13 standards with Class 2A thread tolerances for consistent fit and performance. Features 4-40 UNC coarse threads, fully threaded design, and Phillips No. 1 drive system. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The passivated finish on both screw and washer components ensures maximum corrosion resistance while maintaining dimensional stability across industrial temperature ranges.