The Guard,fan Impeller, cataloged under National Stock Number 4140-01-290-1731, 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 L.m.b Sa. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4140-01-290-1731 |
| Primary Part Number | 502657 |
| Item Name | Guard,fan Impeller |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | L.m.b Sa |
| Status | ACTIVE |
| 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 |
|---|---|
| 502657 | L.m.b Sa (FRA) |
| Reference | Meaning |
|---|---|
| 502657 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4140-01-290-1731 is a Guard,fan Impeller, manufactured by L.m.b Sa, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-290-1731 has 1 manufacturer part number on file: 502657 (L.m.b Sa).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-422-0607. Verify interchangeability with system specifications before substitution.
Key specifications for 502657: Special Features: STEEL WIRE;ZINC PLATED PLUS CLEAR LACQUER FINISH;. 0 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.