The Impeller,pump,centrifugal, cataloged under National Stock Number 4320-00-503-1029, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Middleby Marshall Inc Toastmaster Cooking and Warming Equipment Div. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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 | 4320-00-503-1029 |
| Primary Part Number | A23179 |
| Item Name | Impeller,pump,centrifugal |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Middleby Marshall Inc Toastmaster Cooking and Warming Equipment Div |
| Status | ACTIVE |
| Design Type | SINGLE WIDTH |
| Overall Diameter | 3.500 INCHES NOMINAL IN |
| Mounting Method | THREAD |
| Thread Diameter | 0.438 INCHES NOMINAL IN |
| Thread Direction | LEFT-HAND |
| Blade Quantity | 5 |
| Hub Quantity | 1 |
| Hub Location | SINGLE OUTSIDE OFFSET |
| Screw Thread Series Designator | UNF |
| Thread Quantity | 20 PER INCH |
| Rotation Direction for Which Designed | COUNTERCLOCKWISE |
| 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 |
| Part Number | Manufacturer |
|---|---|
| A23179 PRIMARY | Middleby Marshall Inc Toastmaster Cooking and Warming Equipment Div (USA) |
NSN 4320-00-503-1029 is a Impeller,pump,centrifugal, manufactured by Middleby Marshall Inc Toastmaster Cooking and Warming Equipment Div, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-503-1029 has 1 manufacturer part number on file: A23179 (Middleby Marshall Inc Toastmaster Cooking and Warming Equipment Div).
1 possible match (shared part number, not a government interchangeability claim): 5330-00-976-4659. Verify interchangeability with system specifications before substitution.
Key specifications for A23179: Design Type: SINGLE WIDTH; Overall Diameter: 3.500 INCHES NOMINAL IN; Mounting Method: THREAD; Thread Diameter: 0.438 INCHES NOMINAL IN. 12 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.