The Fan,centrifugal, cataloged under National Stock Number 4140-00-021-4021, 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 Naval Sea Systems Command. Government technical data includes 27 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-00-021-4021 |
| Primary Part Number | 2271856-1 |
| Item Name | Fan,centrifugal |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outlet Location | TOP |
| Mounting Facility Type and Quantity | 4 THREADED INSERT |
| Speed Adjustments | SINGLE SPEED |
| Phase | THREE |
| Frequency in Hertz | 60.0 |
| Inclosure Type | FULLY INCLOSED |
| Outlet Inside Height | 2.684 INCHES NOMINAL IN |
| Length | 10.000 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 115.0 AC |
| Drive Type | DIRECT |
| Prime Mover Power Rating | 0.165 HORSEPOWER |
| Style Designator | FIXED, INVERTED, RECTANGULAR OUTLET |
| Features Provided | RADIO INTERFERENCE SHIELDING |
| Discharge Direction | ANGULAR DOWN AND ANGULAR UP AND HORIZONTAL AND VERTICAL DOWN AND VERTICAL UP |
| Outlet Inside Width | 2.574 INCHES NOMINAL IN |
| Height | 7.780 INCHES NOMINAL IN |
| Operating Speed at Rated Capacity in RPM | 3000.0 |
| Surface Treatment | ENAMEL HOUSING |
| Surface Treatment | ANODIZE AND CADMIUM BLADE |
| Width | 5.030 INCHES NOMINAL IN |
| Material | STEEL HOUSING |
| Material | ALUMINUM AND STEEL BLADE |
| Prime Mover Type | ELECTRIC MOTOR |
| Rotation Direction for Which Designed | COUNTERCLOCKWISE |
| Prime Mover Drive Shaft Bearing Type | BALL |
| Electrical Connection Type | WIRE LEAD |
| Air Flow Rate | 130.0 CUBIC FEET PER MINUTE NOMINAL |
| 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 |
|---|---|
| 2384859-1 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| 2271856-1 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 020644 | 5/2 Secondary reference U.S. Government activity |
| A0-18856-1 | 5/2 Secondary reference U.S. Government activity |
| 2271856-1 | 3/9 Design control — primary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| B53A7L9 | 5/9 Secondary reference Eastern Air Devices Inc Dba Ead Motors |
| G1323-7 | 5/9 Secondary reference U.S. Government activity |
| DXXPI-AS505CCW-190JF | 5/1 Secondary reference U.S. Government activity |
NSN 4140-00-021-4021 is a Fan,centrifugal, manufactured by Naval Sea Systems Command, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-00-021-4021 has 2 manufacturer part numbers on file: 2384859-1 (Lockheed Martin Corporation Div Rms - Mitchel Field), 2271856-1 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-151-5644. Verify interchangeability with system specifications before substitution.
Key specifications for 2271856-1: Outlet Location: TOP; Mounting Facility Type and Quantity: 4 THREADED INSERT; Speed Adjustments: SINGLE SPEED; Phase: THREE. 27 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.