The Coupling Half,quick Disconnect, cataloged under National Stock Number 4730-01-009-9520, 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 Mine Safety Appliances Company. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-009-9520 |
| Primary Part Number | 55716 |
| Item Name | Coupling Half,quick Disconnect |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Connection Style | FLARE ALL ENDS |
| Connection Type | EXTERNAL QUICK DISCONNECT SECOND QUICK DISCONNECT END |
| Connection Type | THREADED INTERNAL TUBE FIRST FLUID END CONNECTION |
| Style Designator | MALE COUPLING HALF |
| Nominal Outside Diameter Tube Accommodated | 0.313 INCHES ALL ENDS IN |
| Quick Disconnect Nominal Size | 0.312 INCHES ALL ENDS IN |
| Leg Length | 0.550 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN |
| Nominal Thread Size | 0.250 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES |
| Surface Treatment | CADMIUM OR ZINC BODY |
| Thread Class | 2B ALL ENDS |
| Material | STEEL BODY |
| Quick Disconnect Method | PUSH-LOCK SECOND QUICK DISCONNECT END |
| Thread Series Designator | UNF 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 |
|---|---|
| 55716 PRIMARY | Mine Safety Appliances Company (USA) |
| Reference | Meaning |
|---|---|
| 2620-482X1PC109 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 010099520 | 5/9 Secondary reference Aero Customs Inc |
NSN 4730-01-009-9520 is a Coupling Half,quick Disconnect, manufactured by Mine Safety Appliances Company, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-009-9520 has 1 manufacturer part number on file: 55716 (Mine Safety Appliances Company).
1 possible match (shared part number, not a government interchangeability claim): 5995-01-391-8475. Verify interchangeability with system specifications before substitution.
Key specifications for 55716: Connection Style: FLARE ALL ENDS; Connection Type: EXTERNAL QUICK DISCONNECT SECOND QUICK DISCONNECT END; Connection Type: THREADED INTERNAL TUBE FIRST FLUID END CONNECTION; Style Designator: MALE COUPLING HALF. 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.