The Fan,centrifugal, cataloged under National Stock Number 1660-01-684-5249, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is Mechatronics, Inc. Div National Precision Bearing. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-684-5249 |
| Primary Part Number | F1238E24B-FHR |
| Item Name | Fan,centrifugal |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Mechatronics, Inc. Div National Precision Bearing |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| Inclosure Type | GUARDED |
| Length | 4.57 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 24.0 DC |
| Drive Type | DIRECT |
| Width | 4.47 INCHES NOMINAL IN |
| Rotation Direction for Which Designed | CLOCKWISE |
| Air Flow Rate | 121.0 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 |
|---|---|
| F1238E24B-FHR PRIMARY | Mechatronics, Inc. Div National Precision Bearing (USA) |
| Reference | Meaning |
|---|---|
| 1775-25-2980 | D/9 Drawing number reference only Sierra Nevada Company, Llc |
| F1238E24B-FHR | 5/9 Secondary reference Mechatronics, Inc Dba National Precision Bearing |
NSN 1660-01-684-5249 is a Fan,centrifugal, manufactured by Mechatronics, Inc. Div National Precision Bearing, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-684-5249 has 1 manufacturer part number on file: F1238E24B-FHR (Mechatronics, Inc. Div National Precision Bearing).
Key specifications for F1238E24B-FHR: Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Inclosure Type: GUARDED; Length: 4.57 INCHES NOMINAL IN; Voltage in Volts and Current Type: 24.0 DC. 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.