The Hose,air Duct, cataloged under National Stock Number 4720-01-533-2640, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4720-01-533-2640 |
| Item Name | Hose,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Status | ACTIVE |
| Measuring Method and Length | 24.750 INCHES NOMINAL OVERALL IN |
| Minimum Inside Bending Radius | 4.000 INCHES IN |
| Connection Style | ROUND BOTH ENDS |
| Connection Type | SOFT BOTH ENDS |
| Style Designator | HELICALLY WOUND CONTINOUS WIRE SUPPORTED |
| Cross-Sectional Shape Style | ROUND |
| Wall Thickness | 0.050 INCHES NOMINAL IN |
| Operating Pressure | 4.5 POUNDS PER SQUARE INCH (PSI) NOMINAL EXTERNAL LBS |
| Specification/standard Data | 80205-NAS1370 THRU 1379 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Inside Diameter | 4.000 INCHES NOMINAL FIRST END IN |
| End Overall Length | 1.500 INCHES NOMINAL BOTH ENDS IN |
| End Inside Diameter | 4.000 INCHES NOMINAL BOTH ENDS IN |
| Material | STEEL REINFORCING WIRE |
| Material | RUBBER CHLOROPRENE CLASS CR SECOND PLY |
| Material | FIBERGLASS REINFORCING CORD |
| Material | RUBBER CHLOROPRENE CLASS CR AND FIBERGLASS FIRST PLY |
| 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 |
|---|---|
| NAS1370 THRU 1379 | D/9 Drawing number reference only U.S. Government activity |
| NAS1369 | 3/1 Design control — primary reference U.S. Government activity |
| NAS1376A16CB087 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4720-01-533-2640 is a Hose,air Duct, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4720-01-665-2869. Verify interchangeability with system specifications before substitution.
Key specifications for 4720-01-533-2640: Measuring Method and Length: 24.750 INCHES NOMINAL OVERALL IN; Minimum Inside Bending Radius: 4.000 INCHES IN; Connection Style: ROUND BOTH ENDS; Connection Type: SOFT BOTH ENDS. 16 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.