The Nut,tube Coupling, cataloged under National Stock Number 4730-01-509-7691, 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 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-509-7691 |
| Primary Part Number | 6640965 PC237 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Thread Series | NGO |
| Special Test Features | CLEAN, DRY, DOUBLE BAG, TAG PER MIL-STD-130 |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.830 INCHES IN |
| Nut Style | TUBE COUPLING |
| Thread Quantity Per Inch | 14 |
| Material | COPPER ALLOY NUT |
| 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 |
|---|---|
| 6640965 PC237 PRIMARY | Naval Sea Systems Command (USA) |
| 6640965 ASSY268 PC237 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2633-100-01 PC237 | 5/2 Secondary reference U.S. Government activity |
| 6640695 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-509-7691 is a Nut,tube Coupling, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-509-7691 has 2 manufacturer part numbers on file: 6640965 PC237 (Naval Sea Systems Command), 6640965 ASSY268 PC237 (Naval Sea Systems Command).
Key specifications for 6640965 PC237: Thread Series: NGO; Special Test Features: CLEAN, DRY, DOUBLE BAG, TAG PER MIL-STD-130; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.830 INCHES IN. 7 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.