The Nut,tube Coupling, cataloged under National Stock Number 4730-00-497-4458, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Apph Ltd. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 22 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-497-4458 |
| Primary Part Number | AN818-3D |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Apph Ltd |
| Status | ACTIVE |
| Length to Shoulder | 0.506 INCHES NOMINAL IN |
| Width Across Flats | 0.438 INCHES NOMINAL IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nondefinitive Spec/std Data | AN818-3D TYPE |
| Nut Height | 0.594 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | ALUMINUM ALLOY OVERALL |
| Smallest Inside Diameter | 0.242 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.188 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| AN818-3D | Apph Ltd (GBR) |
| AN818-3D | Satair A/s (DNK) |
| Reference | Meaning |
|---|---|
| AN818-3D | 5/9 Secondary reference Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company |
| AN818-3D | 5/1 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| 731857-103 | 5/9 Secondary reference Lockheed Martin Corporation Div Rms - Mitchel Field |
| 416775-4 | 5/1 Secondary reference U.S. Government activity |
| AN818-3D | 5/1 Secondary reference Precision Form Rivet Inc |
| 720335-3 | 5/1 Secondary reference Lockheed Martin Corporation Div Rms - Mitchel Field |
| 92618-3 | 5/9 Secondary reference Bendix Corp the |
| SAE-AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
| AN818-3D | 5/1 Secondary reference Hydrasearch Company, Llc |
| AN818-3D | 5/9 Secondary reference Faber Enterprises, Inc. Div Faber Enterprise Inc |
| 8168375 | 5/1 Secondary reference Us Army Aviation and Missile Command |
| 4730PL1777053 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 720335 | 5/1 Secondary reference Lockheed Martin Corporation Div Rms - Mitchel Field |
| AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
| AN818-3D | 5/9 Secondary reference Honeywell Intl Inc Defense Avionics Systems Former Bendix Navigation and Control Systems |
| A8168375 | 5/9 Secondary reference Us Army Aviation and Missile Command |
| AN818-3D | 2/2 Government specification standardization U.S. Government activity |
| AN818-3D | 5/1 Secondary reference Hydro-Fitting Manufacturing Corporation |
| 290-3D | 5/9 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| AN818-3D | 5/1 Secondary reference Raytheon Company Dba Raytheon Co |
NSN 4730-00-497-4458 is a Nut,tube Coupling, manufactured by Apph Ltd, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-497-4458 has 2 manufacturer part numbers on file: AN818-3D (Apph Ltd), AN818-3D (Satair A/s).
1 possible match (shared part number, not a government interchangeability claim): 5961-00-959-3356. Verify interchangeability with system specifications before substitution.
Key specifications for AN818-3D: Length to Shoulder: 0.506 INCHES NOMINAL IN; Width Across Flats: 0.438 INCHES NOMINAL 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.
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.