The Hose Assembly,air Duct, cataloged under National Stock Number 4720-01-497-9939, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4720-01-497-9939 |
| Item Name | Hose Assembly,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Status | ACTIVE |
| Measuring Method and Length | 31.160 INCHES NOMINAL OVERALL IN |
| Criticality Code Justification | FEAT |
| Connection Type | PLAIN FIRST END |
| Style Designator | PERFORATED |
| Material Document and Classification | QQ-S-763, CL304, COND A, FIN 28 FED SPEC SINGLE MATERIAL RESPONSE ALL PLIES |
| Cross-Sectional Shape Style | ROUND |
| Inside Diameter | 4.000 INCHES NOMINAL FIRST END IN |
| Material | STEEL CORROSION RESISTING ALL PLIES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Reference | Meaning |
|---|---|
| 7067252 | D/9 Drawing number reference only Naval Sea Systems Command |
| 512-7067252-5 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| H6431913-5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4720-01-497-9939 is a Hose Assembly,air Duct, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 2040-01-498-0344. Verify interchangeability with system specifications before substitution.
Key specifications for 4720-01-497-9939: Measuring Method and Length: 31.160 INCHES NOMINAL OVERALL IN; Criticality Code Justification: FEAT; Connection Type: PLAIN FIRST END; Style Designator: PERFORATED. 8 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.