The Tailpiece,union, cataloged under National Stock Number 4730-01-335-0663, 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 Inventory Control Point Mechanicsburg. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-335-0663 |
| Primary Part Number | 2640-805X4 PIECE 3L1 |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Seat Type | ANGLE |
| Material | COPPER ALLOY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 2640-805X4 PIECE 3L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 255580 PIECE 6L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 255586 PIECE 3L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 255580 PIECE 3 | 3/1 Design control — primary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 2640-805X4 PIECE 3 | 5/1 Secondary reference U.S. Government activity |
| 255586 PIECE 3 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4730-01-335-0663 is a Tailpiece,union, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-335-0663 has 3 manufacturer part numbers on file: 2640-805X4 PIECE 3L1 (Naval Inventory Control Point Mechanicsburg), 255580 PIECE 6L1 (Naval Inventory Control Point Mechanicsburg), 255586 PIECE 3L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 2640-805X4 PIECE 3L1: Criticality Code Justification: ZZZY; Seat Type: ANGLE; End Item Identification: BALL VALVE,COMBINATION HULL AND BACKUP; Material: COPPER ALLOY. 4 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.