S-99291A560 5/16"-18 Locknuts
Locknuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through top lock distorted thread design that maintains clamping force in high-shock environments
- Exceptional corrosion protection with zinc-flake coating that provides long-lasting durability in harsh industrial conditions
- Reliable thread engagement with Class 2B thread fit ensuring consistent performance and easy assembly
- Heavy-duty performance meeting ASTM Grade C specifications for demanding applications
- Industry-standard compatibility with 5/16"-18 UNC coarse threads for broad application across equipment and machinery
- Secure installation using standard wrench tools thanks to the external hex drive and standard hex profile
- Environmental compliance with REACH and RoHS 3 standards for safe, regulated industrial use
Professional Applications & Engineering Value
This 5/16"-18 UNC locknut with distorted thread technology addresses critical vibration-related failures in industrial equipment. The top lock design creates controlled thread distortion that resists loosening under continuous motion and shock loads, making it ideal for automotive assemblies, heavy machinery, and construction equipment. The zinc-flake-coated steel construction provides superior corrosion resistance compared to standard coatings, extending service life in outdoor or chemically aggressive environments. With ASTM Grade C certification and Class 2B thread fit, this external hex locknut delivers predictable torque performance and reliable clamping force for safety-critical applications where vibration resistance is paramount.
Specification Summary & Compliance
This locknut features 5/16"-18 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy and optimal engagement. Manufactured to ASTM Grade C standards for consistent mechanical properties and performance reliability. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations. Standard external hex drive with 1/2" width and 17/64" height provides compatibility with common installation tools and industry-standard practices.
