The Union,pipe, cataloged under National Stock Number 4730-01-331-6599, 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 Leonardo S.p.a. - Electronics Division - Defence Business Area. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-01-331-6599 |
| Primary Part Number | 1376-18-764-02 |
| Item Name | Union,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Leonardo S.p.a. - Electronics Division - Defence Business Area |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) FIRST END |
| Coupling Flange Shape | ROUND |
| Nominal Overall Length | 135.0 MILLIMETERS MM |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | SCREWED |
| Seat Type | GASKET |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | NPT FIRST 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 |
|---|---|
| 1376-18-764-02 | Leonardo S.p.a. - Electronics Division - Defence Business Area (ITA) |
| 5521529 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 254-052-173 | 3/2 Design control — primary reference U.S. Government activity |
| 254-000-110 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-331-6599 is a Union,pipe, manufactured by Leonardo S.p.a. - Electronics Division - Defence Business Area, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-331-6599 has 2 manufacturer part numbers on file: 1376-18-764-02 (Leonardo S.p.a. - Electronics Division - Defence Business Area), 5521529 (Naval Sea Systems Command).
Key specifications for 1376-18-764-02: Connection Style: PLAIN (PIPE) FIRST END; Coupling Flange Shape: ROUND; Nominal Overall Length: 135.0 MILLIMETERS MM; Connection Type: THREADED EXTERNAL PIPE FIRST END. 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.