S-91253A714 1/2"-13 x 1 1/4" 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in machinery and equipment.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish suitable for industrial environments.
• 82° countersink angle and flat head design allows for a flush, secure fit, preventing snagging and improving aerodynamics in assembled products.
• Fully threaded shank ensures consistent holding power along the entire length, ideal for applications requiring uniform clamping force.
• 5/16" hex drive facilitates easy installation and removal with standard tools, reducing assembly time and labor costs.
• Compliance with ASME B18.3 and ASTM F835 guarantees adherence to industry standards, ensuring interoperability and reliability in professional settings.

Professional Applications & Engineering Value

This 1/2"-13 UNC flat head screw is engineered for heavy-duty industrial applications where strength and precision are critical. Made from black-oxide alloy steel with a Rockwell C39 hardness, it resists wear and deformation in high-vibration environments like machinery assembly, automotive frames, and construction equipment. The coarse thread spacing and Class 3A thread fit provide excellent grip in softer materials or where rapid installation is needed, reducing the risk of cross-threading. The fully threaded design and 82° countersink angle ensure a tight, flush fit, preventing protrusions that could compromise safety or aesthetics. Ideal for industrial fastening in manufacturing and repair, it delivers long-term durability and compliance with rigorous engineering standards.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC thread with Class 3A fit for high precision and coarse spacing, ensuring reliable performance. It meets ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free of hazardous substances, making it suitable for global industrial use. The manufacturing adheres to strict standards for tensile strength (130,000 psi) and hardness (Rockwell C39), guaranteeing consistency and safety in professional applications.