S-91253A458 7/16"-20 x 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 from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance, maintaining joint integrity over time.
• Hex drive compatibility with a 1/4" drive allows for high-torque installation and easy removal, streamlining assembly processes.
• Fully threaded design offers consistent clamping force along the entire 2" length, ideal for varied material thicknesses.
• Compliance with ASTM F835, RoHS 3, and REACH standards ensures material quality and environmental safety for global supply chains.
• Fine UNF threading enhances grip in materials prone to stripping, providing a secure and durable fastening solution.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this black-oxide alloy steel flat head screw addresses critical challenges such as vibration loosening and corrosion in machinery, automotive, and construction sectors. The Class 3A UNF fine threads deliver superior thread engagement, minimizing backlash and ensuring stable connections in high-stress environments. With a Rockwell C39 hardness and 130,000 psi tensile strength, it withstands extreme loads without deformation. The hex drive facilitates quick installation with standard tools, reducing assembly time and labor costs. Its flat head profile sits flush with surfaces, making it ideal for applications where protrusion is a concern, while the black-oxide coating provides an added layer of protection against rust, enhancing durability in outdoor or humid conditions.

Specification Summary & Compliance

This screw features precise Class 3A thread fit with UNF fine threads (7/16"-20) and a length of 2", ensuring dimensional accuracy per industry standards. It complies with ASTM F835 for mechanical properties, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) for chemical safety, supporting use in regulated markets. The manufacturing adheres to strict tolerances for head diameter (0.844") and countersink angle (82°), guaranteeing consistent performance and compatibility.