The Guard,fan Impeller, cataloged under National Stock Number 4140-01-184-0111, 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 Northrop Grumman Systems Corporation. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4140-01-184-0111 |
| Primary Part Number | GG505H1 |
| Item Name | Guard,fan Impeller |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| GG505H1 | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 551147 | 5/9 Secondary reference U.S. Government activity |
| 551147 | 3/9 Design control — primary reference Comair Rotron Inc Sub of Kl Industries Inc |
NSN 4140-01-184-0111 is a Guard,fan Impeller, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-184-0111 has 1 manufacturer part number on file: GG505H1 (Northrop Grumman Systems Corporation).
1 possible match (shared part number, not a government interchangeability claim): 6750-01-427-5344. Verify interchangeability with system specifications before substitution.
Key specifications for GG505H1: Special Features: PLASTIC POLYCARBONATE,4.53 IN.SQUARE,0.26 IN.THK,FOUR 0.18 IN.DIA MTG HOLES ON 4.125 IN.BY 4.125 IN.MTG CENTERS; IN; End Item Identification: 4920-01-121-6794ADAPTER SET,MAINTENANCE. 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.
NSN 4140-01-184-0111 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
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.