The Nut,tube Coupling, cataloged under National Stock Number 4730-00-618-7523, 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 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-00-618-7523 |
| Primary Part Number | NAS593-20 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Aerofit, Llc |
| Status | ACTIVE |
| Length to Shoulder | 0.687 INCHES NOMINAL IN |
| Width Across Flats | 1.750 INCHES NOMINAL IN |
| Thread Series | UN |
| Seat Angle | 33.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.625 INCHES IN |
| Nut Height | 1.190 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | ALUMINUM ALLOY OVERALL |
| Smallest Inside Diameter | 1.255 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 1.250 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 |
|---|---|
| NAS593-20 | Aerofit, Llc (USA) |
| Reference | Meaning |
|---|---|
| NAS593-20 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-618-7523 is a Nut,tube Coupling, manufactured by Aerofit, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-618-7523 has 1 manufacturer part number on file: NAS593-20 (Aerofit, Llc).
Key specifications for NAS593-20: Length to Shoulder: 0.687 INCHES NOMINAL IN; Width Across Flats: 1.750 INCHES NOMINAL IN; Thread Series: UN; Seat Angle: 33.00 DEGREES NOMINAL. 14 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.