The Reducer,pipe, cataloged under National Stock Number 4730-01-684-1978, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-684-1978 |
| Item Name | Reducer,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 3.00 INCHES SECOND END IN |
| Nominal Pipe Size Accommodated | 4.00 INCHES FIRST END IN |
| Connection Style | SOCKET (PIPE) ALL ENDS |
| Nominal Overall Length | 4.00 INCHES IN |
| Connection Type | BUTT WELD PIPE ALL ENDS |
| Operating Pressure | 700.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | OIL SECOND RESPONSE |
| Material | COPPER ALLOY BODY |
| 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 |
| Reference | Meaning |
|---|---|
| MIL-DTL-24202 | 4/1 Identification reference U.S. Government activity |
| MILF24202TY1,4X3(M16420,70/30) | 5/1 Secondary reference U.S. Government activity |
| MIL-DTL-24202A | 5/9 Secondary reference U.S. Government activity |
| M24202TY1,4X3(M16420,70/30) | 2/2 Government specification standardization U.S. Government activity |
NSN 4730-01-684-1978 is a Reducer,pipe, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-685-3242, 4730-01-685-3664. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-684-1978: Nominal Pipe Size Accommodated: 3.00 INCHES SECOND END IN; Nominal Pipe Size Accommodated: 4.00 INCHES FIRST END IN; Connection Style: SOCKET (PIPE) ALL ENDS; Nominal Overall Length: 4.00 INCHES IN. 10 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.