The Nut,tube Coupling, cataloged under National Stock Number 4730-01-201-8877, 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 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-201-8877 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 0.938 INCHES NOMINAL IN |
| Thread Series | UNF |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | MIL-C-895 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Seat Angle | 43.0 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.750 INCHES IN |
| Nut Height | 0.810 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Material | COPPER ALLOY OVERALL |
| Fabrication Method | FORGED |
| Smallest Inside Diameter | 0.505 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.500 INCHES IN |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Reference | Meaning |
|---|---|
| 845-1889863 PC 116 | 5/1 Secondary reference U.S. Government activity |
| 2620-219X1 PC116 | 5/1 Secondary reference U.S. Government activity |
| NS4-8 | 3/1 Design control — primary reference Superior Valve Co |
NSN 4730-01-201-8877 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-233-9965. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-201-8877: Width Across Flats: 0.938 INCHES NOMINAL IN; Thread Series: UNF; Criticality Code Justification: ZZZY; Material Document and Classification: MIL-C-895 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 16 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.