The Nut,tube Coupling, cataloged under National Stock Number 4730-00-348-3608, 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 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-348-3608 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.315 INCHES MINIMUM AND 0.325 INCHES MAXIMUM IN |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Thread Series | UNF |
| Material Document and Classification | MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Seat Angle | 30.0 DEGREES MINIMUM AND 31.0 DEGREES MAXIMUM |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Nut Height | 0.420 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 4130 OR STEEL COMP 8630 OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.190 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.190 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 |
| Reference | Meaning |
|---|---|
| 30-2497 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-348-3608 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 2930-00-774-4859, 5365-00-987-0358, 2510-01-094-2699. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-348-3608: Length to Shoulder: 0.315 INCHES MINIMUM AND 0.325 INCHES MAXIMUM IN; Width Across Flats: 0.500 INCHES NOMINAL IN; Thread Series: UNF; Material Document and Classification: MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND 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.