The Tailpiece,union, cataloged under National Stock Number 4730-01-431-6677, 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 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-431-6677 |
| Primary Part Number | 803-6983468-PC158 |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Union Outside Diameter | 1.975 INCHES NOMINAL IN |
| Nominal Pipe Size Designation | 1.000 INCHES IN |
| End Connection Type | WELDED |
| Seat Type | RECESSED FACE |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 6983468-PIECE 158 | Naval Sea Systems Command (USA) |
| 803-6983468-PC158 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6983468 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-431-6677 is a Tailpiece,union, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-431-6677 has 2 manufacturer part numbers on file: 6983468-PIECE 158 (Naval Sea Systems Command), 803-6983468-PC158 (Naval Sea Systems Command).
Key specifications for 803-6983468-PC158: Union Outside Diameter: 1.975 INCHES NOMINAL IN; Nominal Pipe Size Designation: 1.000 INCHES IN; End Connection Type: WELDED; Overall Length: 1.299 INCHES NOMINAL IN. 5 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.