S-91253A708 1/2"-13 x 7/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 130,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides superior corrosion resistance and durability, extending the screw's service life in harsh environments.
- Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance, minimizing loosening over time.
- Fully threaded design with UNC coarse threads allows for quick installation and strong holding power in various materials.
- 82° countersink angle and flat head profile enable a flush, seamless finish, ideal for applications where protrusion is a concern.
- Hex drive (5/16") facilitates easy installation and removal with standard tools, improving assembly efficiency.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards for safety and environmental regulations.
Professional Applications & Engineering Value
This 1/2"-13 UNC flat head screw is engineered from black-oxide alloy steel to address common industrial challenges such as corrosion, high mechanical stress, and assembly precision. The fully threaded coarse UNC thread design ensures rapid installation and robust grip in materials like metal and hardwood, while the Class 3A fit provides tight tolerance to resist loosening from vibrations. With a Rockwell C39 hardness and high tensile strength, it excels in heavy-duty applications like machinery assembly, construction, and automotive systems, where durability and reliability are critical. The 82° countersink angle allows for a smooth, flush surface, reducing snag risks and enhancing safety in exposed environments.
Specification Summary & Compliance
This screw features precise Class 3A thread fit and UNC coarse threading with a diameter of 0.5" and length of 7/8". It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence in industrial use.
