S-91263A811 5/8"-11 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with zinc-plated alloy steel construction providing reliable corrosion resistance for extended service life in demanding environments.
• Superior load-bearing capability from 130,000 PSI tensile strength and Rockwell C37 hardness, ensuring secure fastening under high-stress conditions.
• Precision thread engagement with Class 3A fit and UNC coarse threading, enabling faster installation and reduced cross-threading risks.
• Optimized flush mounting featuring an 82° countersink angle and standard flat head profile for seamless, vibration-resistant surface integration.
• Efficient high-torque installation using the 3/8" hex drive, allowing quick assembly with standard industrial tools.
• Full-threaded design maximizing grip length and distribution of clamping force across the entire 3" fastener length.
• Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for quality and environmental safety in global applications.

Professional Applications & Engineering Value

These 5/8"-11 UNC flat head screws deliver critical engineering solutions where high tensile strength and vibration resistance are paramount. The zinc-plated alloy steel construction combats corrosion in industrial settings, while the Class 3A thread fit ensures precise, reliable connections in heavy machinery, structural steel framing, and manufacturing equipment. The 82° countersink angle and flat head design provide flush surface mounting, eliminating protrusions that could interfere with moving components. With coarse UNC threading and full threading along the 3" length, these screws offer rapid installation and superior holding power in wood, metal, and composite materials, making them ideal for applications requiring both high clamping force and long-term durability.

Specification Summary & Compliance

Manufactured to exacting standards, these screws feature Class 3A thread fit with 5/8"-11 UNC coarse threads and maintain dimensional accuracy per industrial requirements. The zinc-plated alloy steel construction meets ASTM F835 specifications for mechanical properties and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and unrestricted use in international markets, providing assurance for quality-conscious procurement teams.