The Coupling Assembly,quick Disconne, cataloged under National Stock Number 4730-01-255-7481, 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 12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-255-7481 |
| Item Name | Coupling Assembly,quick Disconne |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Connection Style | FLARED FIRST FLUID END CONNECTION |
| Connection Type | THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION |
| Style Designator | COUPLING ASSEMBLY |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST FLUID END CONNECTION IN |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Leg Length | 0.310 INCHES NOMINAL IN |
| Nominal Thread Size | 0.438 INCHES FIRST FLUID END CONNECTION IN |
| Maximum Operating Temp | 65.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Thread Class | 3A FIRST FLUID END CONNECTION A |
| Material | COPPER ALLOY OVERALL |
| Quick Disconnect Method | QUICK LEAD THREAD ALL ENDS |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST FLUID END CONNECTION |
| 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 |
|---|---|
| 12378-1 | 3/9 Design control — primary reference Universal Propulsion Company Inc Dba Goodrich Div Universal Propulsion Co., Inc. |
| AD57L4 | 5/9 Secondary reference Transdigm Inc Div Adelwiggins Group |
| 12378-1 | 5/9 Secondary reference Stencel Aero Engineering Corp a Talley Industries Co |
NSN 4730-01-255-7481 is a Coupling Assembly,quick Disconne, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6680-01-322-4180. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-255-7481: Connection Style: FLARED FIRST FLUID END CONNECTION; Connection Type: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION; Style Designator: COUPLING ASSEMBLY; Overall Length: 3.487 INCHES NOMINAL 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.