S-91306A285 5/16"-18 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 plating that protects against rust and extends service life in demanding environments
- Superior load-bearing capability from 120,000 psi tensile strength, ensuring reliable performance under high-stress conditions
- Precise, secure fastening with Class 3A thread fit that minimizes backlash and maintains joint integrity
- Enhanced durability thanks to Rockwell C39 hardness, providing excellent resistance to wear and deformation
- Easy installation and removal with 3/16" hex drive that offers superior torque transmission and reduces tool slippage
- Broad industrial compatibility through UNC coarse threading, ideal for quick assembly in various materials
- Regulatory peace of mind with full compliance to RoHS 3 and REACH, meeting strict environmental and safety standards
Professional Applications & Engineering Value
These zinc-plated alloy steel rounded head screws are engineered to address critical challenges in industrial assembly, where vibration resistance, corrosion protection, and consistent clamping force are paramount. The fully threaded UNC coarse design ensures rapid installation and robust holding power in metals, plastics, and composite materials, reducing assembly time while preventing loosening. With a button head profile and hex drive, they provide a low-profile, high-strength solution for machinery, automotive components, and structural frameworks, delivering long-term reliability even in harsh operating conditions. The combination of high tensile strength and Class 3A thread fit eliminates the risk of thread stripping, making them ideal for repetitive disassembly and maintenance cycles.
Specification Summary & Compliance
This screw features precise Class 3A thread fit with UNC coarse threading (5/16"-18) and is manufactured to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing adherence to environmental and health safety standards for global industrial use.
