S-91253A587 5/16"-18 x 1 1/2" ASME B18.3 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
- Superior corrosion resistance from the black-oxide finish extends service life and maintains integrity in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections, minimizing loosening over time.
- Fully threaded coarse UNC design allows for faster installation and stronger holding power in a variety of materials.
- Hex drive compatibility with a 3/16" drive offers easy installation and high torque application without slippage.
- Standard 82° countersink angle ensures a flush, professional finish when seated, ideal for applications requiring a smooth surface.
- Compliance with major standards including ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in regulated industries.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws deliver outstanding durability and corrosion resistance, addressing common challenges like material fatigue and environmental degradation. The fully threaded UNC coarse spacing and Class 3A thread fit ensure rapid, secure fastening in metal, wood, and composite assemblies, reducing installation time while enhancing joint integrity. With a high tensile strength of 130,000 psi and Rockwell C39 hardness, they withstand extreme loads and vibrations in machinery, automotive, and construction sectors, providing long-term reliability and minimizing maintenance needs.
Specification Summary & Compliance
This screw features precise Class 3A thread fit with UNC coarse threading and dimensions including a 5/16"-18 thread size, 1-1/2" length, and 0.656" head diameter. Manufactured in accordance with ASME B18.3 and ASTM F835 specifications, it ensures consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible usage.
