The Nut,tube Coupling, cataloged under National Stock Number 4730-00-448-5253, 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 Aerofit, Llc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-00-448-5253 |
| Primary Part Number | NAS593-40H |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Aerofit, Llc |
| Status | ACTIVE |
| Length to Shoulder | 0.849 INCHES NOMINAL IN |
| Width Across Flats | 3.375 INCHES NOMINAL IN |
| Thread Series | UN |
| Material Document and Classification | QQ-A-225/6,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Seat Angle | 33.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 3.000 INCHES IN |
| Nut Height | 1.563 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Smallest Inside Diameter | 2.514 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 2.500 INCHES 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 |
|---|---|
| NAS593-40H | Aerofit, Llc (USA) |
| Reference | Meaning |
|---|---|
| NAS593-40H | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-448-5253 is a Nut,tube Coupling, manufactured by Aerofit, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-448-5253 has 1 manufacturer part number on file: NAS593-40H (Aerofit, Llc).
Key specifications for NAS593-40H: Length to Shoulder: 0.849 INCHES NOMINAL IN; Width Across Flats: 3.375 INCHES NOMINAL IN; Thread Series: UN; Material Document and Classification: QQ-A-225/6,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 15 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.