fittings › boss nipples
MS21902-4
Military Standard Boss Nipple
Description
outside diameter: 1/4", flareless, carbon steel, MS21902 series fitting
Specifications
| Connection Style | External seat for gasket seal (boss) all ends |
|---|---|
| Connection Type | Threaded external boss all ends |
| Material | Steel |
| Nominallength | 1.062 |
| Specification Data | 96906-ms21902 government standard |
| Style Designator | Flareless with center wrenching facility |
| Surface Treatment | Cadmium |
| Thread Class | 3a all ends |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) all ends |
| Thread Size | 0.438 inches all ends |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS21902-4 — functionally equivalent.
- MS21902V4P Listed alternate 7/16 in · Steel
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Catalog data updated 2026-07-05. Report a data error