S-91306A279 1/4"-20 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 zinc-plated alloy steel construction for long-lasting performance in demanding environments
- Superior load-bearing capability with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Precise thread engagement through Class 3A thread fit and UNC coarse spacing ensuring reliable fastening connections
- Optimized installation efficiency with 5/32" hex drive providing secure tool engagement and reduced slippage
- Versatile rounded button head design offering a low-profile finish while maintaining high clamping force distribution
- Full threading coverage along the 7/8" length for maximum grip range and adjustment flexibility
- Regulatory compliance assurance meeting ASME B18.3 and ASTM F835 standards for quality and safety
Professional Applications & Engineering Value
Engineered for industrial machinery, automotive assemblies, and structural frameworks, these zinc-plated alloy steel rounded head screws address critical fastening challenges where vibration resistance and environmental durability are paramount. The Class 3A thread fit combined with UNC coarse threading provides superior resistance to loosening under dynamic loads, while the fully threaded design ensures consistent clamping force across the entire engagement length. The hex drive system enables high-torque installation without cam-out risks, making these high-strength fasteners ideal for maintenance-critical applications requiring reliable, long-term performance in corrosive or high-stress environments.
Specification Summary & Compliance
This 1/4"-20 x 7/8" rounded head screw features precision Class 3A thread fit with UNC coarse thread spacing and complete threading. Manufactured to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, providing assurance for restricted substance management in industrial applications.
