S-99638A400 3/8"-24 MS21045-6 Locknuts
Locknuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through flex-top locking technology that maintains clamp load in high-stress environments
- Enhanced corrosion protection with cadmium yellow-chromate plating that withstands harsh industrial conditions
- Precise thread engagement with Class 3B UNF fine threads ensuring reliable, secure fastening connections
- Military specification compliance meeting MS21045-6 standards for quality assurance in critical applications
- Easy installation and removal with standard external hex drive design compatible with common tools
- Right-hand thread direction providing familiar installation for standard assembly procedures
- Durable steel construction delivering long-term reliability in demanding mechanical systems
Professional Applications & Engineering Value
This 3/8"-24 UNF flex-top locknut delivers exceptional engineering value in applications where vibration-induced loosening poses significant operational risks. The cadmium yellow-chromate plated steel construction provides dual protection against corrosion and wear, while the flex-top locking mechanism creates consistent friction that maintains tension under dynamic loads. Particularly valuable in aerospace assemblies, industrial machinery, and transportation equipment, this MS21045-6 compliant nut solves the critical challenge of maintaining joint integrity in high-vibration environments. The Class 3B thread fit ensures precise mating with corresponding male threads, eliminating play and reducing the risk of thread damage during repeated installation cycles.
Specification Summary & Compliance
This locknut features 3/8"-24 UNF fine threads with Class 3B thread fit for precision engagement, manufactured to MS21045-6 military specifications. The external hex drive measures 9/16" across flats with a 15/32" height profile. The right-hand thread direction follows industry standards, while the cadmium plating provides environmental protection compliant with industrial corrosion resistance requirements.
