The Impeller,fan,axial, cataloged under National Stock Number 4140-01-503-8284, 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 9 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-503-8284 |
| Primary Part Number | A104A4W6IMP |
| 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 |
| Mounting Hole Quantity | 1 |
| Style Designator | STRAIGHT TIP |
| Attachment Method | TAPER PIN |
| Mounting Hole Diameter | 0.448 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Diameter | 21.091 INCHES MINIMUM AND 21.096 INCHES MAXIMUM IN |
| Blade Quantity | 1 |
| Hub Location | FRONT |
| 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 |
|---|---|
| A104A4W6IMP PRIMARY | Howden American Fan Company Dba American Fan Co Div Howden Usa Company (USA) |
| NV00018 ITEM 3 | Howden American Fan Company Dba American Fan Co Div Howden Usa Company (USA) |
NSN 4140-01-503-8284 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 4140-01-503-8284 has 2 manufacturer part numbers on file: A104A4W6IMP (Howden American Fan Company Dba American Fan Co Div Howden Usa Company), NV00018 ITEM 3 (Howden American Fan Company Dba American Fan Co Div Howden Usa Company).
Key specifications for A104A4W6IMP: Mounting Hole Quantity: 1; Style Designator: STRAIGHT TIP; Attachment Method: TAPER PIN; Mounting Hole Diameter: 0.448 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN. 9 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.