S-91255A032 5/16"-18 x 1/4" 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.
- Superior corrosion resistance from the Black-Oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- High hardness (Rockwell C39) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading allows for faster installation and reduced cross-threading risks, improving assembly efficiency.
- Fully threaded design ensures consistent clamping force along the entire length, enhancing joint stability.
- Hex drive compatibility with standard 3/16" tools enables easy installation and removal in confined spaces.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these Black-Oxide Alloy Steel rounded head hex screws address common challenges like vibration loosening and environmental degradation. The Class 3A thread fit and coarse UNC threading provide superior grip in materials prone to stripping, while the 120,000 psi tensile strength ensures durability in high-load assemblies such as heavy machinery, automotive systems, and structural frameworks. The corrosion-resistant Black-Oxide coating protects against moisture and chemicals, making these fully threaded screws ideal for outdoor equipment, manufacturing plants, and applications requiring RoHS and REACH compliance for environmental safety.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 3A fit for precision assembly, manufactured to ASME B18.3 and ASTM F835 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety requirements.
