The Coupling,tube, cataloged under National Stock Number 4730-01-523-4307, 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 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-523-4307 |
| Item Name | Coupling,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Nominal Overall Length | 2.410 INCHES IN |
| Connection Type | UNTHREADED EXTERNAL TUBE ALL ENDS |
| Style Designator | GROOVED BOTH ENDS |
| Material Document and Classification | AMS5646 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 0.780 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Surface Treatment | PASSIVATE OVERALL |
| Media for Which Designed | GAS, LIQUEFIED SINGLE RESPONSE |
| Material | STEEL COMP 347 OVERALL |
| 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 |
|---|---|
| 123168-1 | 3/2 Design control — primary reference U.S. Government activity |
| 123168 | D/9 Drawing number reference only U.S. Government activity |
NSN 4730-01-523-4307 is a Coupling,tube, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6525-01-537-6401. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-523-4307: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: FLARED (TUBE) ALL ENDS; Nominal Overall Length: 2.410 INCHES IN; Connection Type: UNTHREADED EXTERNAL TUBE ALL ENDS. 11 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.