S-91253A771 1/2"-13 x 12" 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 heavy-load applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, wear-resistant surface for extended service life.
- Class 3A thread fit offers superior precision and tighter tolerances, minimizing backlash and improving assembly integrity.
- Partially threaded design with UNC coarse threads allows for faster installation and better grip in softer materials, saving time on the job site.
- 82° countersink angle and flat head profile enable a flush, secure fit that prevents snagging and maintains a clean, professional finish.
- 5/16" hex drive facilitates easy installation with standard tools, reducing labor effort and increasing efficiency.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous industry and environmental standards, providing peace of mind for regulated projects.
Professional Applications & Engineering Value
Engineered for demanding environments, this black-oxide alloy steel flat head screw excels in construction and industrial applications where high tensile strength and corrosion resistance are critical. The Rockwell C39 hardness and 130,000 psi tensile strength address common issues like material fatigue and shear failure under heavy loads. Its UNC coarse threading and partially threaded shank provide optimal clamping force in wood, metal, and composite assemblies, reducing the need for frequent maintenance. The 82° countersink angle ensures a seamless fit, minimizing protrusion in machinery and structural frameworks. Ideal for use in equipment manufacturing, infrastructure projects, and heavy machinery, this screw delivers long-term reliability and performance in rigorous conditions.
Specification Summary & Compliance
This screw meets precise dimensional standards, including Class 3A thread fit for high accuracy and UNC coarse thread specifications. It conforms to ASTM F835 for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use in various industries.
