S-90272A630 1/4"-28 x 3/4" ASME B18.6.3 Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Exceptional holding power from 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening under load
• Precise thread engagement with Class 2A UNF fine threads ensuring vibration resistance and secure connections
• Optimized drive efficiency through No. 3 Phillips drive design for reduced cam-out and faster installation
• Full-threaded design providing maximum grip along the entire 3/4" length for enhanced load distribution
• Standard-compliant reliability meeting ASME B18.6.3 specifications for consistent performance in industrial applications
• Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets

Professional Applications & Engineering Value

These zinc-plated steel rounded head Phillips screws deliver critical performance advantages in industrial assembly where vibration resistance and corrosion protection are paramount. The UNF fine thread spacing (1/4"-28) creates more thread contact points than coarse threads, significantly reducing loosening under dynamic loads in machinery, automotive components, and electrical enclosures. The pan head profile with 0.492" diameter provides excellent bearing surface while the fully threaded design ensures maximum engagement in both thin and thick materials. With 60,000 psi tensile strength, these fasteners maintain integrity in high-stress applications while the zinc plating offers sacrificial protection against environmental degradation, making them ideal for outdoor equipment, manufacturing fixtures, and maintenance operations requiring durable, compliant fastening solutions.

Specification Summary & Compliance

This 1/4"-28 x 3/4" rounded head Phillips screw features precise Class 2A thread fit tolerances per UNF standards with fine thread spacing for optimal engagement. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, validated as of January 17, 2023. Constructed from zinc-plated steel with Rockwell B70 hardness and fully threaded design, these screws deliver consistent performance across industrial applications requiring standardized fastening components.