The Reducer,tube, cataloged under National Stock Number 4730-01-137-2503, 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 Kovatch Corp.. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-137-2503 |
| Primary Part Number | 402-00136-2 |
| Item Name | Reducer,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Kovatch Corp. |
| Status | ACTIVE |
| Connection Style | COMPRESSION (TUBE) ALL ENDS |
| Seat Nominal Radius | 0.620 INCHES ALL ENDS IN |
| Nominal Overall Length | 1.370 INCHES IN |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES SECOND END IN |
| Nominal Thread Size | 0.437 INCHES SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Thread Class | 2A ALL ENDS A |
| Thread Quantity Per Inch | 24 SECOND END |
| Material | COPPER ALLOY 360 OR COPPER ALLOY 345 OR COPPER ALLOY 377 OVERALL |
| Thread Series Designator | UNEF FIRST END |
| Thread Series Designator | UNS SECOND END |
| 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 |
|---|---|
| 402-00136-2 | Kovatch Corp. (USA) |
| Reference | Meaning |
|---|---|
| 62CA-6-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-137-2503 is a Reducer,tube, manufactured by Kovatch Corp., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-137-2503 has 1 manufacturer part number on file: 402-00136-2 (Kovatch Corp.).
Key specifications for 402-00136-2: Connection Style: COMPRESSION (TUBE) ALL ENDS; Seat Nominal Radius: 0.620 INCHES ALL ENDS IN; Nominal Overall Length: 1.370 INCHES IN; Connection Type: THREADED EXTERNAL TUBE FIRST END. 15 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.