S-91355A081 1/4"-20 x 1/2" ASME B18.3, ASTM F835 Steel Flanged Button Head Hex-Drive Screws
Steel Flanged Button Head Hex-Drive 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 durability and corrosion resistance with black-oxide alloy steel construction, ideal for harsh industrial environments.
- High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration.
- Precise Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during assembly.
- Flanged rounded head design eliminates the need for a separate washer, distributing clamp load evenly and speeding up installation.
- Hex drive compatibility (5/32") allows for high-torque application with standard tools, ensuring secure fastening.
- Fully threaded UNC coarse thread offers quick installation and strong holding power in a wide range of materials.
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.
Professional Applications & Engineering Value
This 1/4-20 x 1/2" rounded head screw is engineered for demanding applications where reliability and strength are critical. The black-oxide alloy steel material provides excellent resistance to corrosion and wear, extending service life in industrial settings such as machinery assembly, automotive components, and construction equipment. The UNC coarse threads and Class 3A thread fit ensure quick, secure fastening with minimal risk of stripping, while the flanged head design enhances stability and reduces assembly time. With a Rockwell C39 hardness and 120,000 psi tensile strength, it handles high-stress environments effectively, making it a trusted choice for engineers and procurement specialists seeking durable, high-performance heavy-duty fasteners.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 3A precision for tight tolerances and reliable fit. It meets ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence for industrial use.
