The Nut,union, cataloged under National Stock Number 4730-01-455-5221, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-455-5221 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 2.380 INCHES NOMINAL IN |
| Thread Series | UN |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nut Counterbore Depth | 0.563 INCHES NOMINAL OVERALL IN |
| Maximum Working Pressure Rating and Service for Which Designed | 6000.0 POUNDS PER SQUARE INCH (PSI) AIR LBS |
| Nominal Thread Size | 2.000 INCHES IN |
| Counterbore Diameter | 1.915 INCHES NOMINAL OVERALL IN |
| Nut Height | 1.125 INCHES NOMINAL IN |
| Countersink Angle | 45.0 DEGREES NOMINAL OVERALL |
| Thread Quantity Per Inch | 12 |
| Material | NICKEL ALLOY OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| PLC-11504 | D/9 Drawing number reference only U.S. Government activity |
| PLC-11504-17 | 5/2 Secondary reference U.S. Government activity |
| 085064DE | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-455-5221 is a Nut,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-545-4046. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-455-5221: Width Across Flats: 2.380 INCHES NOMINAL IN; Thread Series: UN; Material Document and Classification: QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Nut Counterbore Depth: 0.563 INCHES NOMINAL OVERALL IN. 11 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.