S-91263A223 1/2"-20 x 3/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh industrial environments
• Exceptional tensile strength rated at 120,000 PSI ensures reliable performance under high-stress applications
• Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Optimized installation efficiency with 5/16" hex drive design for secure tool engagement and reduced slipping
• Enhanced flush mounting capability featuring 82° countersink angle and standard flat head profile for seamless surface integration
• Maximum thread engagement through fully threaded design improves load distribution and connection integrity
• Industry compliance assurance meeting ASME B18.3 standards for consistent quality and dimensional accuracy

Professional Applications & Engineering Value

This high-strength flat head screw addresses critical engineering challenges in industrial fastening applications where vibration resistance and corrosion protection are paramount. The zinc-plated alloy steel construction combined with Class 3A UNF fine threads creates a durable fastening solution that maintains integrity in high-stress environments. The 82° countersink angle and standard flat head profile ensure flush mounting in precision machinery, automotive assemblies, and structural frameworks where surface clearance is critical. With fully threaded design and 5/16" hex drive, installation efficiency is maximized while providing uniform stress distribution across the entire fastener length, making it ideal for applications requiring repeated disassembly and reassembly without compromising thread integrity.

Specification Summary & Compliance

This flat head screw maintains precision Class 3A thread fit with 1/2"-20 UNF fine thread spacing and right-hand threading according to ASME B18.3 specifications. The fastener features Rockwell C32 hardness and is manufactured from zinc-plated alloy steel for optimal performance. Compliance includes ASME B18.3 standards for dimensional accuracy, RoHS 3 (2015/863/EU) compliance for environmental safety, and REACH (EC 1907/2006) compliance ensuring chemical substance regulations are met for industrial use.