The Impeller,fan,centrifugal, cataloged under National Stock Number 4140-00-406-0044, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-00-406-0044 |
| Item Name | Impeller,fan,centrifugal |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Status | ACTIVE |
| Style Designator | CURVED BLADES SINGLE WIDTH |
| Attachment Method | SETSCREW |
| Diameter | 5.250 INCHES NOMINAL IN |
| Blade Shape | FORWARD CURVE |
| Blade Quantity | 30 |
| Width | 2.906 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Rotation Direction for Which Designed | CLOCKWISE |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY IMPELLER ATTACHMENT METHOD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| AA508-229-1CWSTL/CAD 0.625BORE | 3/1 Design control — primary reference Regal-Beloit Corporation Dba Fasco Group Div Cassville Division |
| 68-2-90 | 5/9 Secondary reference Curtiss-Wright Controls Integrated Sensing, Inc. |
NSN 4140-00-406-0044 is a Impeller,fan,centrifugal, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5940-00-935-7667, 6240-01-663-6067. Verify interchangeability with system specifications before substitution.
Key specifications for 4140-00-406-0044: Style Designator: CURVED BLADES SINGLE WIDTH; Attachment Method: SETSCREW; Diameter: 5.250 INCHES NOMINAL IN; Blade Shape: FORWARD CURVE. 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.