S-91306A284 5/16"-18 x 5/8" 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 tensile strength of 120,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
- Hex drive design allows for high-torque installation using standard tools, speeding up assembly and reducing labor time.
- Fully threaded shank offers maximum grip length and adjustability, ideal for varying material thicknesses.
- Coarse UNC threading enables quicker installation and better performance in softer materials or where debris is present.
- Rounded button head profile delivers a low-profile, finished appearance while minimizing snagging risks.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these zinc-plated alloy steel screws combine high tensile strength and Rockwell C39 hardness to withstand dynamic loads and prevent stripping. The Class 3A UNC coarse thread ensures rapid, secure fastening in machinery, automotive assemblies, and structural frameworks, where vibration resistance is critical. The hex drive and fully threaded design simplify maintenance and provide consistent clamping force, reducing downtime. Ideal for heavy-duty fastening in OEM and MRO applications, these screws offer long-term reliability under strenuous conditions.
Specification Summary & Compliance
This 5/16"-18 UNC x 5/8" rounded head screw features a Class 3A thread fit with coarse spacing for precise engagement. Manufactured to ASME B18.3 and ASTM F835 specifications, it ensures dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe usage in global markets.
