S-91263A570 1/4"-20 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
• Exceptional mechanical strength with 130,000 psi tensile strength for heavy-duty applications
• Reliable thread engagement with UNC coarse threading and Class 3A fit for secure fastening
• Optimized flush mounting with standard 82° countersink angle and flat head design
• Easy installation and removal using standard 5/32" hex drive tools
• Enhanced durability with Rockwell C39 hardness for wear resistance
• Comprehensive compliance meeting ASTM F835, RoHS 3, and REACH regulations

Professional Applications & Engineering Value

These zinc-plated alloy steel flat head screws deliver critical performance advantages in demanding industrial settings. The combination of UNC coarse threading and Class 3A thread fit ensures rapid assembly with minimal cross-threading risk, while the 82° countersink angle provides flush surface mounting for applications where protrusion isn't acceptable. The zinc plating offers substantial corrosion protection, making these flat head screws ideal for machinery, equipment manufacturing, and structural applications where environmental exposure is a concern. With 130,000 psi tensile strength and Rockwell C39 hardness, they maintain integrity under vibration and heavy loads, solving common fastener failure points in industrial assembly operations.

Specification Summary & Compliance

This 1/4"-20 x 3" flat head screw features precise Class 3A thread fit with UNC coarse threading and partial threading configuration. Manufactured to ASTM F835 specifications with Rockwell C39 hardness and 130,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.