The Plug,tube Fitting,threaded, cataloged under National Stock Number 4730-01-328-1827, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-328-1827 |
| Primary Part Number | 256-6603687-VHBM-75 |
| Item Name | Plug,tube Fitting,threaded |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Thread Direction | RIGHT-HAND EXTERNAL |
| Nominal Thread Size | 1.250 INCHES EXTERNAL IN |
| Thread Class | 2A EXTERNAL A |
| Material | NICKEL ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) EXTERNAL |
| 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 |
|---|---|
| 256-6603687-VHBM-75 | Naval Sea Systems Command (USA) |
| 803-5959304-X-65 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 5959304 | D/9 Drawing number reference only Naval Sea Systems Command |
| 5959304-65 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-328-1827 is a Plug,tube Fitting,threaded, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-328-1827 has 2 manufacturer part numbers on file: 256-6603687-VHBM-75 (Naval Sea Systems Command), 803-5959304-X-65 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-339-1074. Verify interchangeability with system specifications before substitution.
Key specifications for 256-6603687-VHBM-75: Overall Length: 3.625 INCHES NOMINAL IN; Thread Direction: RIGHT-HAND EXTERNAL; Nominal Thread Size: 1.250 INCHES EXTERNAL IN; Thread Class: 2A EXTERNAL A. 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.