The Coupling,air Duct, cataloged under National Stock Number 4730-01-546-3550, 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 Naval Sea Systems Command. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-546-3550 |
| Primary Part Number | 512-6406851 FN 156 |
| Item Name | Coupling,air Duct |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Overall Diameter | 8.880 INCHES NOMINAL IN |
| General Characteristics Item Description | SYNTHETIC RUBBER, MIL-R-6855/5 STYLE A |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 512-6406851 FN 156 PRIMARY | Naval Sea Systems Command (USA) |
| DF2680-1556 FN 156 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 512-7410974-F19 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 211071069 | 5/2 Secondary reference U.S. Government activity |
| B643-1023-F19 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-546-3550 is a Coupling,air Duct, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-546-3550 has 3 manufacturer part numbers on file: 512-6406851 FN 156 (Naval Sea Systems Command), DF2680-1556 FN 156 (Huntington Ingalls Inc Div Newport News Shipbuilding), 512-7410974-F19 (Naval Sea Systems Command).
Key specifications for 512-6406851 FN 156: Overall Diameter: 8.880 INCHES NOMINAL IN; General Characteristics Item Description: SYNTHETIC RUBBER, MIL-R-6855/5 STYLE A; Criticality Code Justification: FEAT; Overall Length: 2.500 INCHES NOMINAL IN. 3 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.