The Connection,flexible,pipeline, cataloged under National Stock Number 4730-01-516-7331, 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 Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-516-7331 |
| Primary Part Number | DF2680-1556 FN 166 |
| Item Name | Connection,flexible,pipeline |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Connection Design | STRAIGHT |
| 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 |
|---|---|
| 512-6406851 FN 166 | Naval Sea Systems Command (USA) |
| 512-6903605-F112 | Naval Sea Systems Command (USA) |
| DF2680-1556 FN 166 PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 512-6406851 | D/9 Drawing number reference only Naval Sea Systems Command |
| B643-4010-F12 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-516-7331 is a Connection,flexible,pipeline, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-516-7331 has 3 manufacturer part numbers on file: 512-6406851 FN 166 (Naval Sea Systems Command), 512-6903605-F112 (Naval Sea Systems Command), DF2680-1556 FN 166 (Huntington Ingalls Inc Div Newport News Shipbuilding).
4 possible matches (shared part number, not a government interchangeability claim): 4730-01-516-7336, 4730-01-516-7339, 4730-01-516-7386. Verify interchangeability with system specifications before substitution.
Key specifications for DF2680-1556 FN 166: Connection Design: STRAIGHT; Overall Length: 0.500 INCHES NOMINAL IN; Special Features: FLANGED ROUND SYNTHETIC RUBBER; 4,500WX2.500OD; CHANNEL EXTRUDED SYSTHETIC RUBBER 2.500X1.690X0.187 THICK; OD15.88; ID12.50; End Item Identification: MISC PARTS VENTILATION SYSTEMS SSN. 1 specification is 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.