The Nut,tube Coupling, cataloged under National Stock Number 4730-00-491-3101, 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 Asrc Federal Facilities Logistics, Llc. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-491-3101 |
| Primary Part Number | 65A81C312-02 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Asrc Federal Facilities Logistics, Llc |
| Status | ACTIVE |
| Width Across Flats | 0.441 INCHES NOMINAL0.441 INCHES NOMINAL IN |
| Thread Series | UNFUNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES0.375 INCHES IN |
| Nut Height | 0.210 INCHES NOMINAL0.210 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2A2A |
| Thread Quantity Per Inch | 24 |
| Material | COPPER ALLOY OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.255 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.259 INCHES0.259 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 |
|---|---|
| 65A81C312-02 PRIMARY | Asrc Federal Facilities Logistics, Llc (USA) |
| Reference | Meaning |
|---|---|
| 65A81C312-02 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-491-3101 is a Nut,tube Coupling, manufactured by Asrc Federal Facilities Logistics, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-491-3101 has 1 manufacturer part number on file: 65A81C312-02 (Asrc Federal Facilities Logistics, Llc).
Key specifications for 65A81C312-02: Width Across Flats: 0.441 INCHES NOMINAL0.441 INCHES NOMINAL IN; Thread Series: UNFUNF; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.375 INCHES0.375 INCHES IN. 12 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.