S-95307A100 4-40 MS21042-04 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
- Vibration-resistant locking through distorted thread design prevents loosening under dynamic loads
- Enhanced corrosion protection with cadmium yellow-chromate plating for extended service life in harsh environments
- Integrated flange design eliminates need for separate washers and distributes load over wider surface area
- Precision Class 3B thread fit ensures superior engagement and consistent clamping force
- Military specification compliance (MS21042-04) guarantees reliability for critical applications
- External hex drive provides standard tool compatibility and easy installation in confined spaces
- Coarse UNC threading enables quick assembly and reduced cross-threading risk
Professional Applications & Engineering Value
This 4-40 UNC flange lock nut delivers exceptional vibration resistance through its innovative distorted thread locking technology, making it ideal for aerospace assemblies, industrial machinery, and automotive systems where constant motion threatens fastener integrity. The cadmium yellow-chromate plated steel construction provides dual protection against corrosion and galvanic reactions, while the integrated flange design (0.206" diameter) eliminates washer requirements and prevents surface damage to mounted components. Meeting MS21042-04 specifications with Class 3B thread fit, this nut maintains precise tolerances for critical joints where failure is not an option, ensuring reliable performance in high-stress environments.
Specification Summary & Compliance
This flange lock nut features 4-40 UNC coarse threads with Class 3B fit for precision engagement, manufactured to MS21042-04 military specifications. Dimensions include 5/32" width, 1/8" height, 0.206" flange diameter, and 0.03" flange thickness. The right-hand threaded design with external hex drive provides standard installation compatibility. The cadmium yellow-chromate plating on steel substrate meets corrosion resistance requirements while complying with RoHS and REACH environmental standards for industrial use.
