S-98892A500 1/4"-28 MS21043-4 Flange Nuts
Flange Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Flange Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through center lock distorted threads that maintain clamping force in high-shock environments
- Enhanced corrosion protection with silver-plated A286 stainless steel construction for extended service life
- Precision thread engagement with Class 3B fit ensuring reliable, consistent performance in critical assemblies
- Integrated flange design eliminates need for separate washers while providing superior load distribution
- Environmental compliance meeting both RoHS 3 and REACH standards for global industrial applications
- Optimized installation with standard external hex drive for easy torque application and removal
- Military specification compliance with MS21043-4 certification for aerospace and defense applications
Professional Applications & Engineering Value
This silver-plated A286 stainless steel flange lock nut addresses critical vibration-induced loosening challenges in demanding industrial environments. The center lock distorted thread design creates controlled interference that maintains preload under extreme dynamic loads, while the integrated 0.42" flange distributes clamping force across wider surface areas, preventing surface damage and reducing point loading. The 1/4"-28 UNF fine thread configuration provides superior thread engagement in thin-section materials commonly found in aerospace assemblies, military equipment, and precision machinery. The silver plating on A286 stainless steel offers excellent galvanic compatibility with various mating surfaces while providing additional corrosion resistance beyond the base material's capabilities, making these MS21043-4 compliant nuts ideal for applications where reliability cannot be compromised.
Specification Summary & Compliance
This flange lock nut features Class 3B thread fit precision with 1/4"-28 UNF fine threads in right-hand direction, manufactured to MS21043-4 military specifications. The nut maintains dimensional accuracy with 5/16" width, 7/32" height, 0.42" flange diameter, and 0.04" flange thickness. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for global industrial applications requiring restricted substance control.
