The Nut,tube Coupling, cataloged under National Stock Number 4730-00-287-0276, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4730-00-287-0276 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | CANCELLED |
| Length to Shoulder | 0.579 INCHES NOMINAL IN |
| Width Across Flats | 0.621 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Specification/standard Data | 88044-AN818-5 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Nut Height | 0.672 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Smallest Inside Diameter | 0.370 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.312 INCHES IN |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| AS4841 | 5/9 Secondary reference U.S. Government activity |
| AN818-5 | 2/2 Government specification standardization U.S. Government activity |
| 17014 | C/1 Advisory reference — outside the item-of-supply concept Caterpillar Inc Div Caterpillar Defense |
| SAE-AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
| 5BTX-S | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| MILF5509A | 5/9 Secondary reference U.S. Government activity |
| 4730002870276 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
| 8168376 | 5/1 Secondary reference Us Army Aviation and Missile Command |
| 4730002870276 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 017014 | C/1 Advisory reference — outside the item-of-supply concept Caterpillar Inc Div Caterpillar Defense |
| AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
NSN 4730-00-287-0276 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: cancelled.
11 possible matches (shared part number, not a government interchangeability claim): 5950-00-426-5768, 3040-00-607-1900, 5130-00-672-8671. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-287-0276: Length to Shoulder: 0.579 INCHES NOMINAL IN; Width Across Flats: 0.621 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN; Thread Series: UNF; Thread Direction: RIGHT-HAND. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4730-00-287-0276 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.