S-91255A839 5/16"-24 x 7/8" 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 corrosion resistance with Black-Oxide coating, extending service life in demanding industrial environments
- Superior thread engagement through Class 3A fit and UNF fine threading, ensuring vibration-resistant, secure fastening
- High-torque installation capability with 3/16" hex drive, preventing tool slippage and damage during assembly
- Optimized load distribution from the rounded button head design, reducing surface stress and material deformation
- Reliable performance under extreme conditions backed by 120,000 psi tensile strength and Rockwell C39 hardness
- Full-thread engagement versatility allowing consistent clamping force across the entire 7/8" length
- Regulatory compliance assurance meeting ASME, ASTM, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
Engineered for precision assemblies requiring high-strength fastening solutions, this Black-Oxide Alloy Steel Rounded Head Screw addresses critical industrial challenges. The UNF fine thread spacing and Class 3A thread fit provide superior resistance to vibrational loosening in machinery, automotive, and aerospace applications. The fully threaded design ensures maximum thread engagement in tapped holes, while the rounded button head profile offers a low-profile finish that minimizes snagging in confined spaces. Combined with 120,000 psi tensile strength, this fastener maintains structural integrity in high-stress environments, making it ideal for critical assemblies where failure is not an option.
Specification Summary & Compliance
This precision fastener maintains Class 3A thread tolerances per UNF standards with 5/16"-24 fine threading and right-hand thread direction. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and material restrictions adherence for global industrial use.
