The Hose,air Duct, cataloged under National Stock Number 4720-01-331-8757, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-01-331-8757 |
| Item Name | Hose,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Status | ACTIVE |
| Measuring Method and Length | 5.250 INCHES NOMINAL OVERALL IN |
| Connection Style | ROUND BOTH ENDS |
| Connection Type | SOFT BOTH ENDS |
| Style Designator | BEAD REINFORCED |
| Cross-Sectional Shape Style | ROUND |
| Wall Thickness | 0.050 INCHES NOMINAL IN |
| Operating Pressure | 6.0 POUNDS PER SQUARE INCH (PSI) NOMINAL EXTERNAL LBS |
| Features Provided | OZONE RESISTANT |
| Specification/standard Data | 80205-NAS1370-1379 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Inside Diameter | 4.500 INCHES NOMINAL FIRST END IN |
| End Overall Length | 0.750 INCHES NOMINAL BOTH ENDS IN |
| End Inside Diameter | 4.500 INCHES NOMINAL BOTH ENDS IN |
| Material | FIBERGLASS AND RUBBER CHLOROPRENE CLASS CR ALL PLIES |
| 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 |
|---|---|
| NAS1373A16CF015 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1369 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4720-01-331-8757 is a Hose,air Duct, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
Key specifications for 4720-01-331-8757: Measuring Method and Length: 5.250 INCHES NOMINAL OVERALL IN; Connection Style: ROUND BOTH ENDS; Connection Type: SOFT BOTH ENDS; Style Designator: BEAD REINFORCED. 13 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.