S-90659A102 5/16"-18 Flange Nuts
Flange Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Flange Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through precision serrations that maintain locking force under dynamic loads
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh environments
- Integrated flange design eliminates need for separate washers, reducing assembly time and hardware count
- Reliable coarse threading (UNC) provides faster installation and better performance in dirty or damaged thread conditions
- Precision Class 2B thread fit ensures smooth engagement and consistent torque performance
- Standard hex profile with external drive compatibility for use with common wrenching tools
- Regulatory compliance meets REACH and RoHS 3 standards for global industrial applications
Professional Applications & Engineering Value
This zinc-plated steel flange locknut delivers critical vibration resistance where conventional fasteners fail. The serrated locking mechanism bites into mating surfaces, creating permanent resistance to rotational loosening from machinery vibration, impact loads, and thermal cycling. The integrated 13/16" flange distributes clamping force over a wider area, reducing surface pressure and preventing damage to soft materials. With UNC coarse threading and Class 2B thread fit, this nut maintains reliable performance in high-vibration industrial equipment, automotive assemblies, and construction machinery where safety depends on fastener integrity. The zinc plating provides sacrificial corrosion protection, making it suitable for outdoor applications and environments with moderate chemical exposure.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2B thread fit tolerance for consistent engagement. Features 5/16"-18 UNC coarse thread with right-hand direction and external hex drive compatibility. The 13/16" flange diameter and 0.04" thickness provide optimal load distribution. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use across global industrial markets.
