S-91255A383 5/16"-24 x 1" 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 black-oxide finish, extending service life in demanding industrial environments
- Exceptional torque transmission through 3/16" hex drive design, preventing tool slippage during installation
- Precise thread engagement with Class 3A fine threading (5/16"-24 UNF), ensuring reliable fastening in critical applications
- High mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty performance
- Low-profile rounded head design provides smooth surface finish while maintaining substantial bearing area
- Full regulatory compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global acceptance
- Complete thread coverage along the 1" length enables maximum grip strength in various material thicknesses
Professional Applications & Engineering Value
These black-oxide alloy steel button head screws deliver exceptional performance in precision machinery, automotive assemblies, and industrial equipment where reliable fastening solutions are critical. The combination of Class 3A fine threading and hex drive configuration addresses common installation challenges by providing superior torque transmission while minimizing cross-threading risks. The rounded head profile offers an optimal balance between low clearance requirements and sufficient clamping force distribution. Engineered with 120,000 psi tensile strength, these 5/16"-24 UNF screws maintain structural integrity under vibration and dynamic loads, making them ideal for applications demanding both precision and durability in harsh operating conditions.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit standards with 5/16"-24 UNF fine threading and right-hand thread direction. Complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features fully threaded 1" length with consistent thread diameter of 0.313" and standardized head dimensions (0.547" diameter, 0.166" height) for uniform performance across applications.
