S-90279A077 2-56 x 1/4" ASME B18.6.3 Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Exceptional holding power from 60,000 psi tensile strength and Rockwell B69 hardness for reliable fastening performance
• Quick installation and removal with No. 1 Phillips drive design, reducing assembly time and labor costs
• Optimized thread engagement through fully threaded UNC coarse thread design, preventing loosening under vibration
• Precise dimensional consistency with Class 2A thread fit, ensuring compatibility with standard mating components
• Broad regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial applications
• Versatile rounded head profile providing smooth surface finish while maintaining adequate drive torque capacity

Professional Applications & Engineering Value

These zinc-plated steel screws with 2-56 UNC coarse threading deliver critical performance advantages for industrial assembly applications. The combination of 60,000 psi tensile strength and Rockwell B69 hardness ensures reliable fastening in machinery, electronic enclosures, and precision equipment where vibration resistance is paramount. The fully threaded design maximizes thread engagement throughout the entire 1/4" length, distributing load evenly and preventing joint failure. The zinc plating provides essential corrosion protection for manufacturing environments while maintaining electrical conductivity. With Class 2A thread fit and Phillips drive compatibility, these screws integrate seamlessly into existing production processes, reducing installation time and minimizing the risk of cross-threading during high-volume assembly operations.

Specification Summary & Compliance

This rounded head screw features precise Class 2A thread fit per UNC standards with right-hand threading and 0.086" thread diameter. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations regarding chemical safety, ensuring suitability for global industrial markets and environmentally conscious manufacturing operations.