The Coupling Assembly,self-Sealing, cataloged under National Stock Number 4730-00-618-7568, 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 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-618-7568 |
| Item Name | Coupling Assembly,self-Sealing |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE BODY |
| Second Leg Length | 0.730 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Connection Style | FLARED FIRST QUICK DISCONNECT END |
| Connection Style | BEADED SECOND QUICK DISCONNECT END |
| Nominal Inside Diameter Hose Accommodated | 0.375 INCHES SECOND QUICK DISCONNECT END IN |
| Connection Type | THREADED EXTERNAL TUBE FIRST QUICK DISCONNECT END |
| Connection Type | UNTHREADED EXTERNAL HOSE SECOND QUICK DISCONNECT END |
| Style Designator | COUPLING ASSEMBLY |
| Material Document and Classification | QQ-A-268,T4 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST QUICK DISCONNECT END IN |
| Operating Pressure | 180.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Second End Relationship with First End | NOT IDENTICAL |
| Features Provided | SELF-SEALING |
| Nominal Thread Size | 0.438 INCHES FIRST QUICK DISCONNECT END IN |
| Seat Angle | 37.0 DEGREES |
| First Leg Length | 1.048 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE BODY |
| Thread Class | 3A FIRST QUICK DISCONNECT END A |
| Material | ALUMINUM ALLOY BODY |
| Thread Series Designator | UNF FIRST QUICK DISCONNECT END |
| 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 |
|---|---|
| MS21957 | 4/1 Identification reference U.S. Government activity |
| MS21957-4 | 2/2 Government specification standardization U.S. Government activity |
NSN 4730-00-618-7568 is a Coupling Assembly,self-Sealing, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5340-00-687-9764. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-618-7568: Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE BODY; Second Leg Length: 0.730 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN; Connection Style: FLARED FIRST QUICK DISCONNECT END; Connection Style: BEADED SECOND QUICK DISCONNECT END. 20 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.