S-94414A571 1/4"-28 x 1/2" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws
Alloy Steel Torx 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 torque transmission with Torx Plus IP30 drive, reducing cam-out and tool wear for reliable installation.
- Superior corrosion resistance from black-oxide coating on alloy steel, extending service life in demanding environments.
- High tensile strength of 140,000 psi ensures dependable load-bearing capacity for critical applications.
- Precise Class 3A thread fit provides tighter tolerances and improved fastening security in fine-threaded assemblies.
- Full threading and 82° countersink allow for flush mounting and even stress distribution in thin materials.
- Enhanced durability with Rockwell C39 hardness, resisting deformation under high-stress conditions.
- Broad compliance with ASME, ASTM, RoHS 3, and REACH standards, ensuring quality and environmental safety.
Professional Applications & Engineering Value
Engineered for precision industrial applications, this black-oxide alloy steel flat head screw addresses common challenges like vibration loosening and corrosion. The Torx Plus IP30 drive enables higher torque application without slippage, ideal for automated assembly lines and tight spaces. Its 1/4"-28 UNF fine thread and Class 3A fit provide superior clamping force in metal, plastic, and composite materials, reducing the risk of thread stripping. The 82° countersink angle ensures a smooth, flush finish, preventing snagging in machinery and aerospace components. Fully compliant with major standards, it offers a reliable fastening solution for OEMs and MRO professionals seeking longevity and performance.
Specification Summary & Compliance
This screw meets ASME B18.3 and ASTM F835 specifications, with precise Class 3A thread fit and UNF fine threading for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. Dimensions include a 0.531" head diameter, 1/2" length, and right-hand thread direction, manufactured to inch system standards for reliable integration in global industrial applications.
