S-91253A554 1/4"-20 x 2 1/4" 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
- Superior corrosion resistance with black-oxide finish, extending service life in demanding industrial environments.
- Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress applications without failure.
- Precise Class 3A thread fit provides secure, vibration-resistant fastening for critical assemblies.
- Partially threaded design allows for controlled clamping force and reduced risk of cross-threading during installation.
- 82° countersink angle and flat head profile enable flush mounting for a smooth, professional finish in metal and wood applications.
- Hex drive (5/32") compatibility offers easy installation and removal with standard tools, improving assembly efficiency.
- Compliance with ASTM F835, RoHS 3, and REACH ensures material safety and meets rigorous industrial and environmental standards.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this 1/4"-20 UNC flat head screw in black-oxide alloy steel addresses common challenges like vibration loosening and corrosion in machinery, automotive, and construction sectors. The coarse UNC thread and Class 3A fit deliver superior grip in softer materials, while the partial threading minimizes stress concentration. With a Rockwell C39 hardness and high tensile strength, it withstands dynamic loads, making it ideal for structural fastening where durability and compliance with ASTM F835 are critical. The 82° countersink ensures seamless integration, reducing protrusion risks in precision assemblies.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy, and a length of 2-1/4" with partial threading. It is manufactured in accordance with ASTM F835 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.
