S-91253A383 1/2"-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
- Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress industrial applications.
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance for extended service life in demanding environments.
- 82° countersink angle with standard flat head profile allows for flush mounting and improved aesthetic integration.
- Rockwell C39 hardness rating delivers excellent wear resistance and durability under repetitive loads.
- 5/16" hex drive design enables secure tool engagement and efficient installation with standard industrial tools.
- Compliance with ASTM F835, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
This 1/2"-20 UNF flat head screw delivers critical engineering solutions where high tensile strength and vibration resistance are paramount. The black-oxide alloy steel construction combined with Class 3A thread fit prevents loosening in heavy machinery, automotive assemblies, and structural frameworks. The partial threading design allows for precise clamp load distribution, while the 82° countersink angle ensures seamless flush mounting in precision equipment. These industrial screws maintain integrity under extreme mechanical stress, making them ideal for heavy-duty fastening applications requiring ASTM F835 compliance and long-term reliability.
Specification Summary & Compliance
Manufactured to exact UNF fine thread standards with Class 3A thread fit tolerance, this screw maintains dimensional accuracy across all critical parameters. The product fully complies with ASTM F835 manufacturing specifications and demonstrates adherence to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both mechanical performance and regulatory acceptance in global industrial markets.
