The Impeller,pump,centrifugal, cataloged under National Stock Number 4320-00-398-6504, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-398-6504 |
| Item Name | Impeller,pump,centrifugal |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Status | ACTIVE |
| Keyway Type | RECTANGULAR |
| Keyway Depth | 2.000 INCHES NOMINAL IN |
| Hub Bore Diameter | 5.000 INCHES NOMINAL AND 5.562 INCHES NOMINAL AND 1.129 INCHES NOMINAL IN |
| Design Type | SINGLE WIDTH |
| Overall Diameter | 9.500 INCHES NOMINAL IN |
| Mounting Method | KEY AND THREAD |
| Thread Diameter | 0.625 INCHES NOMINAL IN |
| Keyway Quantity | 1 |
| Thread Direction | RIGHT-HAND |
| Hub Projection Length Beyond Wheel Side | 0.625 INCHES NOMINAL AND 0.562 INCHES NOMINAL IN |
| Blade Quantity | 1 |
| Keyway Length | 0.188 INCHES NOMINAL IN |
| Hub Quantity | 3 |
| Hub Location | SINGLE INSIDE CENTER AND BACK SIDE AND FRONT SIDE |
| Keyway Width | 0.105 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Material | NICKEL ALLOY |
| Thread Quantity | 11 PER INCH |
| 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 |
| Reference | Meaning |
|---|---|
| CA7988-18 | 5/9 Secondary reference U.S. Government activity |
| CA7988-18-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4320-00-398-6504 is a Impeller,pump,centrifugal, classified under FSC 4320, Power and Hand Pumps. Status: active.
Key specifications for 4320-00-398-6504: Keyway Type: RECTANGULAR; Keyway Depth: 2.000 INCHES NOMINAL IN; Hub Bore Diameter: 5.000 INCHES NOMINAL AND 5.562 INCHES NOMINAL AND 1.129 INCHES NOMINAL IN; Design Type: SINGLE WIDTH. 19 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.