S-90279A540 1/4"-20 x 3/4" ASME B18.6.3 Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Excellent tensile strength rated at 60,000 PSI ensures reliable performance under heavy loads and vibration
• Precision Class 2A thread fit provides consistent engagement and reduces cross-threading risks during assembly
• Optimized Phillips No. 3 drive delivers secure tool engagement and efficient installation with standard equipment
• Fully threaded design maximizes grip length and provides uniform clamping force across the entire fastener
• Rounded head profile offers smooth finished appearance and eliminates sharp edges for enhanced safety
• Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH ensures regulatory acceptance for global industrial applications

Professional Applications & Engineering Value

These zinc-plated steel rounded head screws deliver exceptional engineering value through their 1/4-20 UNC coarse thread configuration, which provides rapid installation and superior resistance to vibration loosening in industrial equipment. The combination of 60,000 PSI tensile strength and Rockwell B69 hardness ensures reliable performance in structural assemblies, machinery frames, and heavy-duty enclosures where mechanical stress is a concern. The zinc plating creates a protective barrier against moisture and chemical exposure, making these Phillips drive screws ideal for manufacturing facilities, outdoor equipment, and automotive applications where corrosion resistance is critical. The fully threaded design maximizes surface contact for enhanced load distribution, while the standardized 3/4" length accommodates various material thicknesses in assembly operations.

Specification Summary & Compliance

This fastener features precision UNC coarse threads with Class 2A thread fit tolerance for consistent mating with corresponding nuts and threaded components. Manufacturing strictly adheres to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility and regulatory acceptance for international industrial markets.