The Hose,air Duct,air Breathing, cataloged under National Stock Number 4720-01-355-3310, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Herbert Cooper Co Inc. Government technical data includes 13 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-01-355-3310 |
| Primary Part Number | HC21420-87 |
| Item Name | Hose,air Duct,air Breathing |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Herbert Cooper Co Inc |
| Status | ACTIVE |
| Measuring Method and Length | 87.000 INCHES NOMINAL OVERALL 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 | 0.125 INCHES NOMINAL IN |
| Features Provided | ABRASION RESISTANT |
| Inside Diameter | 1.250 INCHES NOMINAL FIRST END IN |
| End Overall Length | 1.250 INCHES NOMINAL BOTH ENDS IN |
| End Inside Diameter | 1.250 INCHES NOMINAL BOTH ENDS IN |
| Material | RUBBER SYNTHETIC FIRST PLY |
| Material | PLASTIC POLYAMIDE NYLON SECOND PLY |
| Material | RUBBER SYNTHETIC THIRD PLY |
| 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 |
|---|---|
| HC21420-87 PRIMARY | Herbert Cooper Co Inc (USA) |
| Reference | Meaning |
|---|---|
| H707-02 | 3/2 Design control — primary reference U.S. Government activity |
| 12553478 | 5/9 Secondary reference Bae Systems Land & Armaments L.p. |
| 12553478-2 | 7/2 Vendor item drawing reference Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| 12553478 | D/9 Drawing number reference only Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
NSN 4720-01-355-3310 is a Hose,air Duct,air Breathing, manufactured by Herbert Cooper Co Inc, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-01-355-3310 has 1 manufacturer part number on file: HC21420-87 (Herbert Cooper Co Inc).
Key specifications for HC21420-87: Measuring Method and Length: 87.000 INCHES NOMINAL OVERALL IN; Connection Style: ROUND BOTH ENDS; Connection Type: SOFT BOTH ENDS; Style Designator: HELICALLY WOUND CONTINOUS WIRE SUPPORTED. 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.