The Coupling,boss, cataloged under National Stock Number 4730-01-170-5321, 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 Rockwell Collins Inc. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Coupling,boss |
| FSC / FSG | 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings (FSG 47) |
| Manufacturers | The Boeing Company (CAGE 8V613); Rockwell Collins Inc (CAGE 17610) |
| Parameter | Value |
|---|---|
| NSN | 4730-01-170-5321 |
| Primary Part Number | 21602-2 |
| Item Name | Coupling,boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Rockwell Collins Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 7-311112017-41 | The Boeing Company (USA) |
| 21602-2 PRIMARY | Rockwell Collins Inc (USA) |
| Reference | Meaning |
|---|---|
| 7-311112017-41 | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| 21602-1 | C/1 Advisory reference — outside the item-of-supply concept Rockwell Collins Inc |
NSN 4730-01-170-5321 is a Coupling,boss, manufactured by Rockwell Collins Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-170-5321 has 2 manufacturer part numbers on file: 7-311112017-41 (The Boeing Company), 21602-2 (Rockwell Collins Inc).
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-229-1297, 7690-01-386-1110, 3040-01-579-9036. Verify interchangeability with system specifications before substitution.
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.