The Impeller,fan,axial, cataloged under National Stock Number 4140-01-267-9506, 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 Alter Harry Co the Div of T E C. Government technical data includes 8 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 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 | 4140-01-267-9506 |
| Primary Part Number | 21554 |
| Item Name | Impeller,fan,axial |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Alter Harry Co the Div of T E C |
| Status | ACTIVE |
| Mounting Hole Quantity | 4 |
| Attachment Method | BOLT HOLE |
| Mounting Hole Diameter | 0.266 INCHES NOMINAL IN |
| Diameter | 8.000 INCHES NOMINAL IN |
| Blade Quantity | 5 |
| Mounting Bolt Circle Diameter | 1.000 INCHES NOMINAL IN |
| Material | ALUMINUM OVERALL |
| Rotation Direction for Which Designed | CLOCKWISE |
| 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 |
|---|---|
| 21554 PRIMARY | Alter Harry Co the Div of T E C (USA) |
NSN 4140-01-267-9506 is a Impeller,fan,axial, manufactured by Alter Harry Co the Div of T E C, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-267-9506 has 1 manufacturer part number on file: 21554 (Alter Harry Co the Div of T E C).
2 possible matches (shared part number, not a government interchangeability claim): 8145-01-523-4330, 5310-01-524-8761. Verify interchangeability with system specifications before substitution.
Key specifications for 21554: Mounting Hole Quantity: 4; Attachment Method: BOLT HOLE; Mounting Hole Diameter: 0.266 INCHES NOMINAL IN; Diameter: 8.000 INCHES NOMINAL IN. 8 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.