The Coupling Half,quick Disconnect, cataloged under National Stock Number 4730-00-442-7221, 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 Parker-Hannifin Corporation Div Electronic Controls Division. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-442-7221 |
| Primary Part Number | ST-N4 |
| Item Name | Coupling Half,quick Disconnect |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Parker-Hannifin Corporation Div Electronic Controls Division |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE BODY |
| Connection Style | PLAIN ALL ENDS |
| Connection Type | THREADED INTERNAL PIPE FIRST FLUID END CONNECTION |
| Connection Type | EXTERNAL QUICK DISCONNECT ALL ENDS |
| Style Designator | MALE COUPLING HALF |
| Leg Length | 0.969 INCHES NOMINAL IN |
| Nominal Thread Size | 0.500 INCHES ALL ENDS IN |
| Surface Treatment | CADMIUM BODY |
| Material | STEEL BODY |
| Quick Disconnect Method | PUSH-PULL ALL ENDS |
| Thread Series Designator | NPT ALL ENDS |
| 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 |
|---|---|
| ST-N4 PRIMARY | Parker-Hannifin Corporation Div Electronic Controls Division (USA) |
| 50FP | Foster Manufacturing Co, Inc. Dba Foster Manufacturing Co (USA) |
| ST-N4 | Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupling Division (USA) |
| 4T26 PRIMARY | Tuthill Corp Hansen Coupling Div (USA) |
| Reference | Meaning |
|---|---|
| 7746653P33 | 5/9 Secondary reference Lockheed Martin Corporation Div Rms |
| ST-N4 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-442-7221 is a Coupling Half,quick Disconnect, manufactured by Parker-Hannifin Corporation Div Electronic Controls Division, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-442-7221 has 4 manufacturer part numbers on file: ST-N4 (Parker-Hannifin Corporation Div Electronic Controls Division), 50FP (Foster Manufacturing Co, Inc. Dba Foster Manufacturing Co), ST-N4 (Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupling Division), 4T26 (Tuthill Corp Hansen Coupling Div).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-487-6135. Verify interchangeability with system specifications before substitution.
Key specifications for ST-N4: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE BODY; Connection Style: PLAIN ALL ENDS; Connection Type: THREADED INTERNAL PIPE FIRST FLUID END CONNECTION; Connection Type: EXTERNAL QUICK DISCONNECT 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.