The Impeller,pump,centrifugal, cataloged under National Stock Number 4320-00-565-3121, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Insinger Machine Co. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4320-00-565-3121 |
| Primary Part Number | UP3-1 |
| Item Name | Impeller,pump,centrifugal |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Insinger Machine Co |
| Status | ACTIVE |
| Hub Bore Diameter | 1.118 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN |
| Hub Length | 1.500 INCHES NOMINAL IN |
| Design Type | SINGLE WIDTH |
| Overall Diameter | 4.250 INCHES NOMINAL IN |
| Hub Projection Length Beyond Wheel Side | 0.750 INCHES NOMINAL IN |
| Blade Quantity | 5 |
| Hub Quantity | 1 |
| Hub Location | CENTERED |
| Material | IRON CAST |
| Rotation Direction for Which Designed | CLOCKWISE |
| Blade Type | FORWARD CURVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4320-00-565-3121 is a Impeller,pump,centrifugal, manufactured by Insinger Machine Co, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-565-3121 has 2 manufacturer part numbers on file: SK473 (Insinger Machine Co), UP3-1 (Insinger Machine Co).
1 possible match (shared part number, not a government interchangeability claim): 5130-01-344-2920. Verify interchangeability with system specifications before substitution.
Key specifications for UP3-1: Hub Bore Diameter: 1.118 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN; Hub Length: 1.500 INCHES NOMINAL IN; Design Type: SINGLE WIDTH; Overall Diameter: 4.250 INCHES NOMINAL IN. 11 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.