The Coupling Half,quick Disconnect, cataloged under National Stock Number 4730-00-203-0177, 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 Federal Commercial Item Description Promulgated by General Services Administration Washington DC. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-203-0177 |
| Primary Part Number | AA59439-005-16-00-B |
| Item Name | Coupling Half,quick Disconnect |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 0.500 INCHES ALL ENDS IN |
| Connection Style | PLAIN ALL ENDS |
| Connection Type | INTERNAL QUICK DISCONNECT ALL ENDS |
| Connection Type | THREADED EXTERNAL PIPE FIRST FLUID END CONNECTION |
| Style Designator | MALE COUPLING HALF |
| Leg Length | 1.000 INCHES NOMINAL IN |
| Nominal Thread Size | 0.500 INCHES ALL ENDS IN |
| Specification/standard Data | 58536-A-A-59439 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |
| Nondefinitive Spec/std Data | 1 TYPE AND 1 STYLE AND C CLASS |
| Material | COPPER ALLOY 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 |
|---|---|
| AA59439-005-16-00-B | Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA) |
| Reference | Meaning |
|---|---|
| 5300 | C/1 Advisory reference — outside the item-of-supply concept Tuthill Corp Hansen Coupling Div |
| A-A-59439 | 4/1 Identification reference Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
| MIL-C-4109 | 5/9 Secondary reference U.S. Government activity |
| M4109-05-16-00-B | 5/9 Secondary reference U.S. Government activity |
| AA59439-05-16-00-B | 5/9 Secondary reference Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
| B36-238 | 5/9 Secondary reference U.S. Government activity |
| 5300-1/2 | 5/1 Secondary reference Tuthill Corp Hansen Coupling Div |
NSN 4730-00-203-0177 is a Coupling Half,quick Disconnect, manufactured by Federal Commercial Item Description Promulgated by General Services Administration Washington DC, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-203-0177 has 1 manufacturer part number on file: AA59439-005-16-00-B (Federal Commercial Item Description Promulgated by General Services Administration Washington DC).
2 possible matches (shared part number, not a government interchangeability claim): 5310-00-285-1522, 6675-01-656-2305. Verify interchangeability with system specifications before substitution.
Key specifications for AA59439-005-16-00-B: Nominal Pipe Size Accommodated: 0.500 INCHES ALL ENDS IN; Connection Style: PLAIN ALL ENDS; Connection Type: INTERNAL QUICK DISCONNECT ALL ENDS; Connection Type: THREADED EXTERNAL PIPE FIRST FLUID END CONNECTION. 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.