S-91253A425 7/16"-14 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 high-stress applications and prevents 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 guarantees secure mating with nuts and tapped holes, reducing the risk of loosening under vibration.
• Fully threaded UNC coarse spacing provides faster installation and higher resistance to stripping compared to fine threads.
• 82° countersink angle and flat head design allows for a flush finish, minimizing protrusion and improving safety in assembled products.
• High hardness (Rockwell C39) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Compliance with ASTM F835, RoHS 3, and REACH ensures material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these black-oxide alloy steel flat head screws address critical challenges like vibration-induced loosening and corrosion. The fully threaded UNC coarse spacing enables quick assembly in thick materials, while the Class 3A thread fit ensures tight tolerances for secure fastening in machinery, automotive frames, and structural components. The 82° countersink angle facilitates a smooth, flush surface, ideal for applications where aerodynamics or safety are priorities. With a tensile strength of 130,000 psi and Rockwell C39 hardness, these screws withstand heavy loads and repetitive stress, reducing maintenance needs and downtime in heavy-duty industrial fastening systems.

Specification Summary & Compliance

This screw meets precise dimensional standards, including Class 3A thread fit for superior engagement and UNC coarse thread spacing per inch. Manufacturing adheres to ASTM F835 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe use in various industries.