The Impeller,fan,axial, cataloged under National Stock Number 4140-01-421-3614, 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 Howden American Fan Company Dba American Fan Co Div Howden Usa Company. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Impeller,fan,axial |
| FSC / FSG | 4140 — Fans, Air Circulators, and Blower Equipment (FSG 41) |
| Manufacturers | Howden American Fan Company Dba American Fan Co Div Howden Usa Company (CAGE 53555); Fm Af, Llc Dba American Fan Company (CAGE 75477) |
| Parameter | Value |
|---|---|
| NSN | 4140-01-421-3614 |
| Primary Part Number | 505551-1583 |
| Item Name | Impeller,fan,axial |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Howden American Fan Company Dba American Fan Co Div Howden Usa Company |
| Status | ACTIVE |
| 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 |
|---|---|
| 505551-1583 PRIMARY | Howden American Fan Company Dba American Fan Co Div Howden Usa Company (USA) |
| FF-18511 PC 2 | Fm Af, Llc Dba American Fan Company (USA) |
| Reference | Meaning |
|---|---|
| 505551-1583 | 5/9 Secondary reference Fm Af, Llc Dba American Fan Company |
| 505551-1504 | 3/9 Design control — primary reference Fm Af, Llc Dba American Fan Company |
NSN 4140-01-421-3614 is a Impeller,fan,axial, manufactured by Howden American Fan Company Dba American Fan Co Div Howden Usa Company, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-421-3614 has 2 manufacturer part numbers on file: 505551-1583 (Howden American Fan Company Dba American Fan Co Div Howden Usa Company), FF-18511 PC 2 (Fm Af, Llc Dba American Fan Company).
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.