The Impeller,fan,axial, cataloged under National Stock Number 4140-01-508-6543, 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 6 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-508-6543 |
| Primary Part Number | A1/2A4W6IMP |
| 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 | BOLT HOLE |
| Blade Quantity | 7 |
| Hub Location | CENTER |
| Material | ALUMINUM ALLOY BLADE |
| 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 |
|---|---|
| A1/2A4W6IMP PRIMARY | Fm Af, Llc Dba American Fan Company (USA) |
| Reference | Meaning |
|---|---|
| A1/2A4W6IMP | 5/9 Secondary reference Howden American Fan Company Dba American Fan Co Div Howden Usa Company |
| NV 00011 REV D ITEM 3 | 5/9 Secondary reference Howden American Fan Company Dba American Fan Co Div Howden Usa Company |
| D264953 | 5/9 Secondary reference Howden American Fan Company Dba American Fan Co Div Howden Usa Company |
NSN 4140-01-508-6543 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 4140-01-508-6543 has 1 manufacturer part number on file: A1/2A4W6IMP (Fm Af, Llc Dba American Fan Company).
Key specifications for A1/2A4W6IMP: Style Designator: STRAIGHT TIP; Attachment Method: BOLT HOLE; Blade Quantity: 7; Hub Location: CENTER. 6 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.