The Nut,tube Coupling, cataloged under National Stock Number 4730-00-516-3544, 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 Chicago Fittings. 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 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 | 4730-00-516-3544 |
| Primary Part Number | 300-6L |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Chicago Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.547 INCHES NOMINAL IN |
| Width Across Flats | 0.750 INCHES NOMINAL IN |
| Thread Series | UNS |
| Seat Angle | 30.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.687 INCHES IN |
| Nut Height | 0.672 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | COPPER ALLOY OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.3825 INCHES MINIMUM AND 0.3875 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.375 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 |
|---|---|
| 300-6L PRIMARY | Chicago Fittings (USA) |
NSN 4730-00-516-3544 is a Nut,tube Coupling, manufactured by Chicago Fittings, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-516-3544 has 1 manufacturer part number on file: 300-6L (Chicago Fittings).
1 possible match (shared part number, not a government interchangeability claim): 5930-00-808-3760. Verify interchangeability with system specifications before substitution.
Key specifications for 300-6L: Length to Shoulder: 0.547 INCHES NOMINAL IN; Width Across Flats: 0.750 INCHES NOMINAL IN; Thread Series: UNS; Seat Angle: 30.00 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.