S-91263A562 1/4"-20 x 1" 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 holding power with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precise thread engagement with Class 3A fit UNC coarse threading ensuring reliable, vibration-resistant connections
• Streamlined installation with 82° countersink angle and 5/32" hex drive for flush mounting and efficient assembly
• Full regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards for quality assurance and environmental safety
• Versatile fastening solution with fully threaded 1" length providing maximum grip across various material thicknesses
• Industry-standard compatibility with right-hand UNC thread pattern ensuring interchangeability with existing systems

Professional Applications & Engineering Value

Engineered for industrial fastening applications requiring both strength and precision, these zinc-plated alloy steel flat head screws deliver exceptional performance in machinery assembly, structural frameworks, and equipment manufacturing. The UNC coarse threading with Class 3A fit provides superior resistance to vibration loosening while enabling quick installation in various materials. The 82° countersink angle ensures flush mounting for safety and aesthetic requirements, while the hex drive design allows for high-torque application without cam-out. These fully threaded screws maintain consistent 130,000 psi tensile strength throughout their length, making them ideal for applications where uniform clamping force is critical across different material thicknesses in heavy-duty fastening scenarios.

Specification Summary & Compliance

This 1/4"-20 flat head screw features precision UNC coarse threading with Class 3A thread fit for superior dimensional accuracy and reliable performance. Manufactured to ASTM F835 specifications with complete compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The screw maintains exacting dimensional tolerances with 1" length, 0.531" head diameter, and standard flat head profile for consistent performance across industrial applications.