The Impeller,fan,axial, cataloged under National Stock Number 4140-01-503-9944, 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. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-503-9944 |
| Primary Part Number | A7A4W6IMP-A |
| 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 |
| Style Designator | STRAIGHT TIP |
| Attachment Method | KEYWAY AND LOCKNUT |
| Diameter | 19.500 INCHES NOMINAL IN |
| Blade Quantity | 7 |
| 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 |
|---|---|
| A7A4W6IMP-A PRIMARY | Howden American Fan Company Dba American Fan Co Div Howden Usa Company (USA) |
| Reference | Meaning |
|---|---|
| NV 00015 REV D ITEM 3 | D/9 Drawing number reference only Howden American Fan Company Dba American Fan Co Div Howden Usa Company |
| D264957 | D/9 Drawing number reference only Howden American Fan Company Dba American Fan Co Div Howden Usa Company |
NSN 4140-01-503-9944 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 4140-01-503-9944 has 1 manufacturer part number on file: A7A4W6IMP-A (Howden American Fan Company Dba American Fan Co Div Howden Usa Company).
Key specifications for A7A4W6IMP-A: Style Designator: STRAIGHT TIP; Attachment Method: KEYWAY AND LOCKNUT; Diameter: 19.500 INCHES NOMINAL IN; Blade Quantity: 7. 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.