S-91306A254 4-40 x 5/8" ASTM F835 Steel Button Head Hex-Drive Screws
Steel 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
- Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments.
- High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration.
- Precise Class 3A thread fit provides excellent engagement and reduces the risk of cross-threading during assembly.
- Durable Rockwell C39 hardness offers excellent wear resistance and maintains thread integrity.
- Hex drive (1/16") design allows for secure tool engagement and efficient installation with standard drivers.
- Fully threaded coarse (UNC) design ensures maximum holding power and faster installation in a variety of materials.
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in professional applications.
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated alloy steel rounded head screws are engineered to address critical fastening challenges in industrial settings. The coarse thread (UNC) and fully threaded design provide superior pull-out resistance and rapid installation in metals and plastics, reducing assembly time. The zinc plating offers a protective barrier against corrosion, making these button head screws ideal for machinery, automotive assemblies, and electronic enclosures where environmental durability is essential. Combined with a hex drive for high torque application, they deliver reliable clamping force and vibration resistance, ensuring long-term joint integrity in heavy-duty fastening applications.
Specification Summary & Compliance
This product features a Class 3A thread fit for precise dimensional accuracy per UNC standards, with a length of 5/8" and a right-hand thread direction. Manufacturing and material specifications conform to ASME B18.3 and ASTM F835. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they are free of hazardous substances and suitable for global industrial supply chains.
