The Impeller,fan,axial, cataloged under National Stock Number 4140-00-449-9619, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Rtx Corporation Div Pratt & Whitney. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-00-449-9619 |
| Primary Part Number | 18-168 |
| Item Name | Impeller,fan,axial |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Style Designator | STRAIGHT TIP |
| Attachment Method | KEYWAY |
| Diameter | 8.745 INCHES MAXIMUM IN |
| Blade Quantity | 7 |
| 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 |
|---|---|
| 18-168 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| 18-168 | 5/9 Secondary reference U.S. Government activity |
NSN 4140-00-449-9619 is a Impeller,fan,axial, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-00-449-9619 has 1 manufacturer part number on file: 18-168 (Rtx Corporation Div Pratt & Whitney).
3 possible matches (shared part number, not a government interchangeability claim): 6620-00-604-4918, 1650-00-724-0898, 2990-01-717-5508. Verify interchangeability with system specifications before substitution.
Key specifications for 18-168: Style Designator: STRAIGHT TIP; Attachment Method: KEYWAY; Diameter: 8.745 INCHES MAXIMUM IN; Blade Quantity: 7. 4 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.