fittings › boss nipples
MS21900D4
Military Standard Boss Nipple
Description
Boss Nipple
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 |
| Material | Aluminum |
| Nominallength | 1.188 |
| Specification Data | 96906-ms21900 government standard |
| Style Designator | Flared and flareless w/ center wrenching facility |
| Surface Treatment | Anodize |
| Thread Class | 3a all ends |
| Thread Series Designator | Unjf 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.
- MS21900D3
- MS21900D4
- MS21900D5
- MS21900D6
- MS21900D8
- MS21900D10
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS21900D4 — functionally equivalent.
- MS21900W4 Listed alternate 7/16 in · Aluminum
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error