S-91306A257 5-40 x 3/8" 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
- Superior corrosion resistance from zinc plating protects against rust and environmental degradation, extending service life in harsh industrial settings.
- Precise Class 3A thread fit guarantees tight, secure connections with minimal play, enhancing assembly accuracy and vibration resistance.
- Robust Rockwell C39 hardness provides excellent wear resistance and durability, maintaining thread integrity through repeated use.
- Hex drive design with 5/64" drive size allows for easy installation and high torque application, speeding up assembly while reducing tool slippage.
- Fully threaded coarse UNC design enables quick engagement and strong holding power in a variety of materials, improving installation efficiency.
- Compliance with major industry standards including ASME B18.3 and ASTM F835 ensures consistent quality and interoperability with other components.
Professional Applications & Engineering Value
Engineered for industrial applications requiring reliable fastening solutions, these zinc-plated alloy steel screws combine high tensile strength with corrosion-resistant properties to address common challenges in machinery assembly, electronic enclosures, and structural frameworks. The rounded button head profile with hex drive provides a low-profile, secure fastening method that withstands vibration and heavy loads. With coarse UNC threads and Class 3A fit, these screws offer quick installation and superior grip in both metal and composite materials, reducing assembly time while maintaining joint integrity. Their fully threaded design ensures maximum contact surface area, distributing stress evenly to prevent loosening under dynamic conditions.
Specification Summary & Compliance
This 5-40 UNC screw features precise Class 3A thread fit with coarse thread spacing and maintains dimensional accuracy per ASME B18.3 and ASTM F835 manufacturing specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
