S-91263A755 5/16"-24 x 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure
• Superior corrosion resistance provided by zinc plating extends service life in harsh industrial environments
• Precision Class 3A thread fit delivers secure, vibration-resistant connections with minimal play
• Fine thread spacing offers improved adjustment control and better load distribution compared to coarse threads
• 82° countersink angle enables flush mounting for cleaner aesthetics and reduced snag hazards
• Full threading along the entire shank provides maximum grip strength throughout the engagement length
• Hex drive design allows for high-torque installation with standard tools, speeding up assembly processes

Professional Applications & Engineering Value

These zinc-plated alloy steel flat head screws with 5/16"-24 UNF fine threading are engineered to solve critical fastening challenges in industrial applications where vibration resistance and corrosion protection are paramount. The combination of Rockwell C39 hardness and 130,000 psi tensile strength ensures these fasteners maintain integrity under heavy loads and dynamic stresses. The standard 82° countersink profile allows for seamless integration into machinery, automotive components, and structural assemblies where flush surfaces are required. The Class 3A thread fit provides exceptional precision for applications demanding minimal backlash and reliable performance in high-vibration environments, making them ideal for manufacturing equipment, transportation systems, and heavy machinery where fastener failure is not an option.

Specification Summary & Compliance

This 5/16"-24 UNF flat head screw features precision Class 3A thread fit with fine thread spacing and maintains dimensional accuracy per industry standards. The fastener is manufactured in compliance with ASTM F835 specifications and meets stringent regulatory requirements including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental responsibility and workplace safety. The right-hand threading and fully threaded design provide consistent performance across the entire engagement length.