The Fan,centrifugal, cataloged under National Stock Number 4140-01-077-3981, 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 Zero Corp. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-077-3981 |
| Primary Part Number | 1NB412 |
| Item Name | Fan,centrifugal |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Zero Corp |
| Status | ACTIVE |
| Outlet Inside Height | 2.594 INCHES NOMINAL IN |
| Length | 6.469 INCHES NOMINAL IN |
| Drive Type | DIRECT |
| Style Designator | FIXED, RECTANGULAR OUTLETS |
| Height | 6.797 INCHES NOMINAL IN |
| Width | 8.906 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Rotation Direction for Which Designed | COUNTERCLOCKWISE |
| Static Pressure at Specified Air Flow Rate | ERR-060 |
| 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 |
|---|---|
| 1NB412 | Zero Corp (USA) |
| Reference | Meaning |
|---|---|
| 1NB412 | 3/9 Design control — primary reference Zero Corp Mclean Engineering Div |
NSN 4140-01-077-3981 is a Fan,centrifugal, manufactured by Zero Corp, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-077-3981 has 1 manufacturer part number on file: 1NB412 (Zero Corp).
Key specifications for 1NB412: Outlet Inside Height: 2.594 INCHES NOMINAL IN; Length: 6.469 INCHES NOMINAL IN; Drive Type: DIRECT; Style Designator: FIXED, RECTANGULAR OUTLETS. 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.