The Coupling Half,quick Disconnect, cataloged under National Stock Number 4730-00-394-9743, 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 Tuthill Corp Hansen Coupling Div. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-394-9743 |
| Primary Part Number | ML3-K21 |
| Item Name | Coupling Half,quick Disconnect |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Tuthill Corp Hansen Coupling Div |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 0.375 INCHES ALL ENDS IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE BODY |
| Connection Style | PLAIN ALL ENDS |
| Mating End Identification | U.S.ARMY MISSILE COMMAND COUPLING HALF,QUICK DISCONNECT,PART NO.10293006 |
| Connection Type | THREADED INTERNAL PIPE FIRST FLUID END CONNECTION |
| Connection Type | EXTERNAL QUICK DISCONNECT ALL ENDS |
| Style Designator | MALE COUPLING HALF |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE BODY |
| Features Provided | SELF-SEALING |
| Nominal Thread Size | 0.375 INCHES ALL ENDS IN |
| Surface Treatment | PASSIVATE 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 |
|---|---|
| ML3-K21 PRIMARY | Tuthill Corp Hansen Coupling Div (USA) |
| 10293007 | Us Army Aviation and Missile Command (USA) |
| Reference | Meaning |
|---|---|
| ML3K21S | 5/9 Secondary reference Hansen Mfg Co Inc |
| LL3-K21 | C/1 Advisory reference — outside the item-of-supply concept Tuthill Corp Hansen Coupling Div |
| ML3K21 | 3/9 Design control — primary reference Hansen Mfg Co Inc |
NSN 4730-00-394-9743 is a Coupling Half,quick Disconnect, manufactured by Tuthill Corp Hansen Coupling Div, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-394-9743 has 2 manufacturer part numbers on file: ML3-K21 (Tuthill Corp Hansen Coupling Div), 10293007 (Us Army Aviation and Missile Command).
Key specifications for ML3-K21: Nominal Pipe Size Accommodated: 0.375 INCHES ALL ENDS IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE BODY; Connection Style: PLAIN ALL ENDS; Mating End Identification: U.S.ARMY MISSILE COMMAND COUPLING HALF,QUICK DISCONNECT,PART NO.10293006. 14 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.