S-95092A328 4-40 x 1/2" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Flat and Split Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated split lock washer to prevent loosening in demanding industrial environments
• Exceptional corrosion protection through 18-8 stainless steel construction and passivated surface treatment
• High-strength performance delivering 70,000 psi tensile strength for reliable fastening in critical applications
• Optimized drive engagement with No. 1 Phillips drive for efficient installation and reduced cam-out risk
• Precision thread compatibility featuring Class 2A UNC coarse threads for secure mating with standard components
• Complete threading coverage along the full 1/2" length for maximum grip and load distribution
• Regulatory compliance assurance meeting ASME B18.13 specifications and environmental standards

Professional Applications & Engineering Value

These 4-40 UNC rounded head Phillips screws with integrated lock washers provide engineered solutions for vibration-prone industrial assemblies. The 18-8 stainless steel material combined with passivated finish delivers exceptional corrosion resistance in harsh environments, while the coarse thread design ensures rapid installation and reliable performance in various substrates. The pan head profile with No. 1 Phillips drive offers optimal torque transmission, reducing installation time and tool wear. Particularly valuable in machinery, electronic enclosures, and equipment subjected to dynamic loads, these fully threaded screws maintain joint integrity where vibration-induced loosening would compromise safety and operational reliability.

Specification Summary & Compliance

This fastener features 4-40 UNC coarse threads with Class 2A thread fit tolerance, ensuring precise mating with standard components. The 1/2" length maintains dimensional accuracy within -0.02" to 0" tolerance. Manufacturing and performance comply with ASME B18.13 specifications, while environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards. The integrated lock washer (0.375" OD, 0.062" thickness) and flat washer (0.375" OD, 0.04" thickness) are manufactured from matching 18-8 stainless steel with passivated finish for consistent corrosion protection throughout the assembly.