The Expansion Joint,pipe, cataloged under National Stock Number 4730-01-274-0806, 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 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-274-0806 |
| Primary Part Number | 3258421-4 |
| Item Name | Expansion Joint,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Nominal Pipe Size Designation | 4.000 INCHES IN |
| End Connection Type | FLANGED |
| Criticality Code Justification | FEAT |
| Working Pressure Rating | 225.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Bolt Hole Quantity | 8 |
| Bolt Circle Diameter | 7.500 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Surface Treatment | CADMIUM FLANGE |
| Material | STEEL FLANGE |
| Flange Outside Diameter | 9.000 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 3258421-4 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 800-USA-4 | Kadant Unaflex Llc (USA) |
| Reference | Meaning |
|---|---|
| 800-USA-4 | 3/9 Design control — primary reference Unaflex, Inc. |
| 3258421 | D/9 Drawing number reference only Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| MS0PP0400 | 5/9 Secondary reference Metraflex Company the |
| METRASPHERE 4IN-OUN | 5/9 Secondary reference Metraflex Company the |
| 800-USA-4 | 5/9 Secondary reference Unaflex Inc. |
NSN 4730-01-274-0806 is a Expansion Joint,pipe, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-274-0806 has 2 manufacturer part numbers on file: 3258421-4 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 800-USA-4 (Kadant Unaflex Llc).
Key specifications for 3258421-4: Nominal Pipe Size Designation: 4.000 INCHES IN; End Connection Type: FLANGED; Criticality Code Justification: FEAT; Overall Length: 5.375 INCHES NOMINAL IN. 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.