The Reducer,tube, cataloged under National Stock Number 4730-01-296-5704, 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 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-296-5704 |
| Primary Part Number | 221-5557344 PIECE 12 |
| Item Name | Reducer,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Connection Style | GROOVED INSIDE (TUBE) FIRST END |
| Connection Style | GROOVED INSIDE (TUBE) SECOND END |
| Nominal Overall Length | 2.625 INCHES IN |
| Connection Type | UNTHREADED INTERNAL TUBE FIRST END |
| Connection Type | UNTHREADED INTERNAL TUBE SECOND END |
| Material Document and Classification | ASTM-A582,COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 1.000 INCHES FIRST END IN |
| Reduced Passage Nominal Inside Diameter | 0.502 INCHES SECOND END IN |
| Reduced Passage Nominal Inside Diameter | 1.002 INCHES FIRST END IN |
| Media for Which Designed | FUEL SINGLE RESPONSE |
| Material | STEEL CORROSION RESISTING OVERALL |
| Reducer Type | CONCENTRIC |
| 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 |
|---|---|
| 221-5557344 PIECE 12 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 221-5557344 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-296-5704 is a Reducer,tube, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-296-5704 has 1 manufacturer part number on file: 221-5557344 PIECE 12 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4530-01-301-4566. Verify interchangeability with system specifications before substitution.
Key specifications for 221-5557344 PIECE 12: Connection Style: GROOVED INSIDE (TUBE) FIRST END; Connection Style: GROOVED INSIDE (TUBE) SECOND END; Nominal Overall Length: 2.625 INCHES IN; Connection Type: UNTHREADED INTERNAL TUBE FIRST END. 13 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.