fittings › boss nipples
MS21900-6
Military Standard Boss Nipple
Description
outside diameter: 3/8", adapter, flareless tube to flared tube, carbon steel, MS21900 series fitting (REPLACEMENT PART IS MS21900V6P)
Specifications
| Connection Style | External seat for gasket seal (boss) 2nd end, Flared w/ gasket seal (boss) 1st end |
|---|---|
| Connection Type | Threaded external boss all ends |
| Criticality Code Justification | Feat |
| Material | Steel |
| Material Specification | Qq-a-637 federal specification single material response |
| Maximum Operating Pressure | 3000.0 pounds per square inch single response |
| Maximum Operating Temp | 275.0 degrees fahrenheit single response |
| Media For Which Designed | Fluid single response |
| Nominallength | 1.281 |
| Special Features | Weapon system essential |
| Specification Data | 96906-ms21900 government standard |
| Style Designator | Flared and flareless w/ center wrenching facility |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Class 2 federal specification single treatment response type 2 qq-p-416 |
| Thread Class | 3a all ends |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) all ends |
| Thread Size | 0.562 inches all ends |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- MS21900-4
- MS21900-5
- MS21900-5D
- MS21900-6
- MS21900-8
- MS21900-10
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS21900-6 — functionally equivalent.
- MS21900V6P Listed alternate 9/16 in · CRES
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error