S-99291A350 3/8"-16 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 distorted top-lock threads that maintain secure fastening under extreme conditions
- Enhanced corrosion protection with black-oxide steel coating for extended service life in demanding environments
- Reliable thread engagement with Class 2B thread fit ensuring consistent performance and easy assembly
- High-strength construction meeting ASTM Grade C specifications for heavy-duty industrial applications
- Standard external hex drive for compatibility with common tools and straightforward installation
- Regulatory compliance with REACH and RoHS 3 standards for safe, environmentally responsible manufacturing
- Optimized dimensions (9/16" width, 21/64" height) providing balanced profile for space-constrained applications
Professional Applications & Engineering Value
This 3/8"-16 UNC locknut delivers critical vibration resistance through its innovative distorted thread locking mechanism, specifically designed to prevent loosening in high-stress environments. The black-oxide steel construction provides essential corrosion protection while maintaining the ASTM Grade C strength rating required for industrial machinery, automotive assemblies, and construction equipment. The coarse UNC thread pattern with Class 2B fit ensures reliable engagement even in applications subject to thermal cycling or dynamic loading. Engineered for permanent fastening solutions, this external hex locknut combines installation convenience with long-term performance reliability, making it ideal for maintenance-critical applications where safety and durability are paramount.
Specification Summary & Compliance
This locknut features 3/8"-16 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy and consistent performance. Manufactured to ASTM Grade C strength specifications with distorted top-lock thread technology for secure fastening. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring regulatory adherence for industrial applications worldwide.
