S-90279A583 5/16"-18 x 1" 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 driving efficiency with Phillips No. 3 drive design providing secure tool engagement and reduced cam-out
• Reliable thread engagement through fully threaded UNC coarse spacing for faster assembly and strong holding power
• High mechanical strength with 60,000 psi tensile strength and Rockwell B69 hardness for heavy-duty applications
• Precision thread fit with Class 2A tolerance ensuring consistent performance and easy installation
• Optimized head design featuring rounded profile for reduced surface marring and improved aesthetics
• Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

This zinc-plated steel rounded head Phillips screw delivers exceptional value in industrial assembly where corrosion resistance and mechanical reliability are paramount. The UNC coarse thread configuration enables rapid installation in various materials while maintaining strong vibration resistance. The fully threaded design ensures maximum engagement length, distributing stress evenly along the fastener for improved load-bearing capacity. The Phillips No. 3 drive system provides superior torque transmission, reducing installation time and minimizing driver slippage in high-volume production environments. Engineered to ASME B18.6.3 standards, these screws offer consistent dimensional accuracy for replacement parts and new equipment assembly across manufacturing, machinery, and structural applications.

Specification Summary & Compliance

This 5/16"-18 x 1" rounded head screw features Class 2A thread fit per UNC standards with coarse thread spacing for optimal performance. Manufactured to ASME B18.6.3 specifications with complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental responsibility and regulatory adherence. The fastener maintains precise dimensional tolerances throughout production, delivering reliable performance in industrial applications requiring 60,000 psi tensile strength and Rockwell B69 hardness characteristics.