The Reducer,tube, cataloged under National Stock Number 4730-00-640-1298, 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 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-640-1298 |
| Primary Part Number | 271-5901-958523ALT5PC105 |
| Item Name | Reducer,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Connection Style | PLAIN (TUBE) SECOND END |
| Connection Style | SOCKET (TUBE) FIRST END |
| Tubing Wall Nominal Thickness for Which Designed | 0.083 INCHES FIRST END IN |
| Tubing Wall Nominal Thickness for Which Designed | 0.083 INCHES SECOND END IN |
| Nominal Overall Length | 2.625 INCHES IN |
| Connection Type | UNTHREADED INTERNAL TUBE FIRST END |
| Connection Type | UNTHREADED EXTERNAL TUBE SECOND END |
| Nominal Outside Diameter Tube Accommodated | 2.125 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 2.625 INCHES FIRST END IN |
| Reduced Passage Nominal Inside Diameter | 1.688 INCHES ALL ENDS IN |
| Material | COPPER ALLOY 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 |
|---|---|
| 271-5901-958523ALT5PC105 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 271-5901-958525REV1PC17 | 3/2 Design control — primary reference U.S. Government activity |
| 271-5901-958523ALT5PC105 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-640-1298 is a Reducer,tube, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-640-1298 has 1 manufacturer part number on file: 271-5901-958523ALT5PC105 (Naval Sea Systems Command).
Key specifications for 271-5901-958523ALT5PC105: Connection Style: PLAIN (TUBE) SECOND END; Connection Style: SOCKET (TUBE) FIRST END; Tubing Wall Nominal Thickness for Which Designed: 0.083 INCHES FIRST END IN; Tubing Wall Nominal Thickness for Which Designed: 0.083 INCHES SECOND END IN. 12 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.