S-91306A289 5/16"-24 x 1/2" 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-plated alloy steel construction for extended service life in harsh environments
- Exceptional tensile strength rated at 120,000 psi for reliable performance in high-stress applications
- Precision Class 3A thread fit ensures secure fastening with minimal backlash in critical assemblies
- Fine UNF threading provides enhanced vibration resistance and superior clamping force distribution
- Hex drive compatibility with 3/16" drive size enables efficient installation with standard industrial tools
- Full threading design allows maximum engagement depth and adjustment flexibility
- Comprehensive regulatory compliance meets ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global acceptance
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 5/16"-24 UNF rounded head screws deliver exceptional performance where vibration resistance and precise clamping are critical. The zinc-plated alloy steel construction provides reliable corrosion protection in manufacturing environments, while the Rockwell C39 hardness ensures durability against wear and deformation. The fine thread configuration with Class 3A fit maintains tight tolerances in precision equipment, automotive assemblies, and heavy machinery where vibration loosening poses significant operational risks. The button head profile with hex drive facilitates quick installation in confined spaces without compromising structural integrity.
Specification Summary & Compliance
These rounded head screws feature precise Class 3A thread fit per UNF standards with 5/16"-24 fine threading and 1/2" length. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict material and safety standards.
