S-91263A563 1/4"-20 x 1 1/4" ASTM F835 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 demanding environments
• Exceptional 130,000 psi tensile strength provides reliable fastening performance for heavy-duty industrial applications
• Precision Class 3A thread fit ensures consistent engagement and vibration resistance in critical assemblies
• 82° countersink angle design allows for flush mounting with standard countersunk holes for clean, professional finishes
• Full threading along the entire 1-1/4" length maximizes grip range and installation flexibility
• 5/32" hex drive compatibility enables secure tool engagement and efficient installation with standard tools
• Rockwell C39 hardness rating maintains structural integrity under high stress and repeated use

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws deliver exceptional engineering value for industrial applications requiring reliable, high-strength fastening solutions. The zinc-plated alloy steel construction provides superior corrosion protection in manufacturing environments, while the Class 3A thread fit ensures precise engagement that resists loosening under vibration. The 82° countersink angle and flat head design create seamless surface finishes in machinery, equipment assembly, and structural applications. With 130,000 psi tensile strength and full threading, these screws maintain clamping force in demanding applications where joint integrity is critical. The combination of coarse UNC threading and hex drive configuration enables quick installation and removal, making them ideal for maintenance-heavy industrial settings and production lines where efficiency and reliability are paramount.

Specification Summary & Compliance

This 1/4"-20 UNC flat head screw features precision Class 3A thread fit with coarse thread spacing and right-hand threading. Manufactured to meet ASTM F835 specifications for mechanical properties and performance standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications. Dimensions include 1-1/4" length, 0.531" head diameter, and 5/32" hex drive size, providing consistent performance and compatibility with standard industrial specifications.