The Impeller,fan,axial, cataloged under National Stock Number 4140-01-576-8826, 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 Fm Af, Llc Dba American Fan Company. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-576-8826 |
| Primary Part Number | B7W-71837-1 |
| Item Name | Impeller,fan,axial |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Fm Af, Llc Dba American Fan Company |
| Status | ACTIVE |
| Mounting Hole Quantity | 1 |
| Style Designator | OVERLAPPING ROUNDED TIP |
| Attachment Method | BOLT HOLE |
| Mounting Hole Diameter | 1.563 INCHES MINIMUM AND 1.564 INCHES MAXIMUM IN |
| Diameter | 29.168 INCHES MINIMUM AND 29.172 INCHES MAXIMUM IN |
| Blade Quantity | 6 |
| Material | ALUMINUM OVERALL |
| Rotation Direction for Which Designed | COUNTERCLOCKWISE |
| 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 |
|---|---|
| B7W-71837-1 PRIMARY | Fm Af, Llc Dba American Fan Company (USA) |
| Reference | Meaning |
|---|---|
| R1-3566 PC1 | 5/1 Secondary reference Fm Af, Llc Dba American Fan Company |
NSN 4140-01-576-8826 is a Impeller,fan,axial, manufactured by Fm Af, Llc Dba American Fan Company, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-576-8826 has 1 manufacturer part number on file: B7W-71837-1 (Fm Af, Llc Dba American Fan Company).
Key specifications for B7W-71837-1: Mounting Hole Quantity: 1; Style Designator: OVERLAPPING ROUNDED TIP; Attachment Method: BOLT HOLE; Mounting Hole Diameter: 1.563 INCHES MINIMUM AND 1.564 INCHES MAXIMUM 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.