S-91306A253 4-40 x 1/8" 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
- Exceptional tensile strength of 120,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh environments and minimizing maintenance needs.
- Precise Class 3A thread fit provides tight tolerances and secure fastening, enhancing assembly integrity and vibration resistance.
- Fully threaded UNC coarse design allows for quick installation and strong grip in various materials, improving efficiency in production lines.
- Hex drive compatibility with a 1/16" drive size offers easy torque application and reduces stripping, saving time during maintenance or repairs.
- High hardness rating of Rockwell C39 ensures durability against wear and deformation, supporting long-term use in demanding settings.
- Rounded button head profile delivers a low-profile, aesthetic finish while reducing snagging risks in assembled products.
Professional Applications & Engineering Value
This 4-40 UNC rounded head screw is engineered from zinc-plated alloy steel to address common industrial challenges such as corrosion and mechanical stress. The coarse thread and Class 3A fit ensure rapid, secure fastening in materials like metal and plastic, minimizing loosening from vibrations. Ideal for industrial applications including machinery assembly, electronics enclosures, and automotive components, its fully threaded design and hex drive enable efficient installation with standard tools. By combining high tensile strength and environmental compliance, it provides a dependable solution for engineers seeking longevity and regulatory adherence in fastening systems.
Specification Summary & Compliance
This product features precise Class 3A thread fit per UNC standards, with dimensions including a 1/8" length and 4-40 thread size. It meets ASME B18.3 and ASTM F835 manufacturing specifications, ensuring consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental and safety standards for global industrial use.
