The Nut,tube Coupling, cataloged under National Stock Number 4730-00-678-9726, 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 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-00-678-9726 |
| Primary Part Number | 1787807PC3 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Length to Shoulder | 0.422 INCHES NOMINAL IN |
| Width Across Flats | 0.688 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-16232,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNF |
| Material Document and Classification | QQ-S-637 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.562 INCHES IN |
| Nut Height | 0.641 INCHES NOMINAL IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 18 |
| Material | STEEL COMP 1212 OR STEEL COMP 1118 OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.344 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.312 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 |
|---|---|
| 1787807PC3 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 1787809PC3 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 205-5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-678-9726 is a Nut,tube Coupling, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-678-9726 has 2 manufacturer part numbers on file: 1787807PC3 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 1787809PC3 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 1787807PC3: Length to Shoulder: 0.422 INCHES NOMINAL IN; Width Across Flats: 0.688 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-16232,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNF. 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.