The Expansion Joint,pipe, cataloged under National Stock Number 4730-01-274-0805, 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 Kadant Unaflex Llc. Government technical data includes 9 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-274-0805 |
| Primary Part Number | 800-USA-3 |
| Item Name | Expansion Joint,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Kadant Unaflex Llc |
| Status | ACTIVE |
| Nominal Pipe Size Designation | 2.000 INCHES IN |
| End Connection Type | FLANGED |
| Working Pressure Rating | 225.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 4.750 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Surface Treatment | CADMIUM FLANGE |
| Material | STEEL FLANGE |
| Flange Outside Diameter | 6.000 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 | X |
| Part Number | Manufacturer |
|---|---|
| 3258421-3 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 800-USA-3 PRIMARY | Kadant Unaflex Llc (USA) |
| Reference | Meaning |
|---|---|
| 800-USA-3 | 3/9 Design control — primary reference Unaflex Inc. |
| 3258421 | D/9 Drawing number reference only Naval Sea Systems Command |
| 3258421-3-10001 | 5/9 Secondary reference Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) |
| METRASPHERE 2IN-OUN | 5/9 Secondary reference Metraflex Company the |
NSN 4730-01-274-0805 is a Expansion Joint,pipe, manufactured by Kadant Unaflex Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-274-0805 has 2 manufacturer part numbers on file: 3258421-3 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 800-USA-3 (Kadant Unaflex Llc).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-274-0806. Verify interchangeability with system specifications before substitution.
Key specifications for 800-USA-3: Nominal Pipe Size Designation: 2.000 INCHES IN; End Connection Type: FLANGED; Overall Length: 4.125 INCHES NOMINAL IN; Working Pressure Rating: 225.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS. 9 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.