The Impeller,pump,centrifugal, cataloged under National Stock Number 4320-01-028-1678, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-028-1678 |
| Item Name | Impeller,pump,centrifugal |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Status | ACTIVE |
| Keyway Type | RECTANGULAR |
| Keyway Depth | 0.117 INCHES NOMINAL IN |
| Hub Bore Diameter | 1.251 INCHES MINIMUM AND 1.252 INCHES MAXIMUM IN |
| Hub Length | 1.657 INCHES NOMINAL IN |
| Design Type | SINGLE WIDTH |
| Overall Diameter | 9.050 INCHES NOMINAL IN |
| Mounting Method | KEY |
| Keyway Quantity | 1 |
| Hub Projection Length Beyond Wheel Side | 0.678 INCHES NOMINAL IN |
| Blade Quantity | 2 |
| Keyway Length | 1.657 INCHES NOMINAL IN |
| Hub Quantity | 1 |
| Hub Location | CENTERED |
| Keyway Width | 0.251 INCHES NOMINAL IN |
| Material | NICKEL ALLOY |
| Rotation Direction for Which Designed | CLOCKWISE |
| Blade Type | BACKWARD CURVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 58053 | 5/9 Secondary reference U.S. Government activity |
| 058053 9.05IN | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 058053 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4320-01-028-1678 is a Impeller,pump,centrifugal, classified under FSC 4320, Power and Hand Pumps. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 5945-01-345-8224, 3040-01-522-5322, 5935-01-546-0892. Verify interchangeability with system specifications before substitution.
Key specifications for 4320-01-028-1678: Keyway Type: RECTANGULAR; Keyway Depth: 0.117 INCHES NOMINAL IN; Hub Bore Diameter: 1.251 INCHES MINIMUM AND 1.252 INCHES MAXIMUM IN; Hub Length: 1.657 INCHES NOMINAL IN. 17 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.