The Coupling,tube, cataloged under National Stock Number 4730-00-187-4989, 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 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-187-4989 |
| Item Name | Coupling,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Nominal Overall Length | 1.375 INCHES IN |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Surface Treatment | CADMIUM OUTSIDE |
| Thread Class | 3B FIRST END |
| Thread Series Designator | UNF FIRST END |
| 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 |
|---|---|
| 1143720 | 5/9 Secondary reference The Boeing Company |
| 1143720 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-187-4989 is a Coupling,tube, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 2910-01-055-9447. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-187-4989: Nominal Overall Length: 1.375 INCHES IN; Nominal Outside Diameter Tube Accommodated: 0.250 INCHES FIRST END IN; Nominal Thread Size: 0.250 INCHES FIRST END IN; Surface Treatment: CADMIUM OUTSIDE. 6 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.