The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-00-277-3359, 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 Naval Sea Systems Command. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-277-3359 |
| Primary Part Number | 841337PC8 |
| Item Name | Inverted Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.766 INCHES NOMINAL IN |
| Seat Angle in Deg | 10.0 |
| Tube Outside Diameter for Which Designed | 0.405 INCHES NOMINAL IN |
| Style Designator | INVERTED NUT, TUBE, FLARE |
| Material Document and Classification | MIL-N-20164 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-N-894, CLASS A-CANCELED MIL SPEC 2ND MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 2-12 |
| Screw Thread Series Designator | UNS |
| Thread Class | 3A A |
| Material | NICKEL ALLOY OR NICKEL ALLOY 400 |
| Fabrication Method | BAR STOCK, MACHINED |
| Smallest Inside Diameter | 0.453 INCHES NOMINAL 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 |
|---|---|
| 841337PC8 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 841337 | D/9 Drawing number reference only Naval Sea Systems Command |
| 5000S4823F841337 | 5/9 Secondary reference U.S. Government activity |
| 5000S4823F841337 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4730-00-277-3359 is a Inverted Nut,tube Coupling, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-277-3359 has 1 manufacturer part number on file: 841337PC8 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4730-00-289-7969. Verify interchangeability with system specifications before substitution.
Key specifications for 841337PC8: Width Across Flats: 0.766 INCHES NOMINAL IN; Seat Angle in Deg: 10.0; Tube Outside Diameter for Which Designed: 0.405 INCHES NOMINAL IN; Style Designator: INVERTED NUT, TUBE, FLARE. 13 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.