The Impeller,fan,axial, cataloged under National Stock Number 4140-01-192-9857, 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 Fm Af, Llc Dba American Fan Company. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4140-01-192-9857 |
| Primary Part Number | 505551-663 |
| Item Name | Impeller,fan,axial |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Fm Af, Llc Dba American Fan Company |
| Status | ACTIVE |
| Style Designator | STRAIGHT TIP |
| Attachment Method | KEYWAY |
| Diameter | 25.050 INCHES MINIMUM AND 25.060 INCHES MAXIMUM IN |
| Blade Quantity | 9 |
| Hub Location | CENTER |
| Material | ALUMINUM ALLOY OVERALL |
| Rotation Direction for Which Designed | COUNTERCLOCKWISE |
| 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 |
|---|---|
| 505551-663 PRIMARY | Fm Af, Llc Dba American Fan Company (USA) |
| Reference | Meaning |
|---|---|
| 50551-347 | C/1 Advisory reference — outside the item-of-supply concept Fm Af, Llc Dba American Fan Company |
| FF-9119 PIECE 11 | 5/1 Secondary reference Fm Af, Llc Dba American Fan Company |
NSN 4140-01-192-9857 is a Impeller,fan,axial, manufactured by Fm Af, Llc Dba American Fan Company, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-192-9857 has 1 manufacturer part number on file: 505551-663 (Fm Af, Llc Dba American Fan Company).
1 possible match (shared part number, not a government interchangeability claim): 1560-01-434-6358. Verify interchangeability with system specifications before substitution.
Key specifications for 505551-663: Style Designator: STRAIGHT TIP; Attachment Method: KEYWAY; Diameter: 25.050 INCHES MINIMUM AND 25.060 INCHES MAXIMUM IN; Blade Quantity: 9. 7 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.