The Pump,rotary, cataloged under National Stock Number 4320-00-451-4557, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Kalmar AC Inc. Government technical data includes 7 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 | 4320-00-451-4557 |
| Primary Part Number | 4813903 |
| Item Name | Pump,rotary |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Kalmar AC Inc |
| Status | ACTIVE |
| Operating Speed at Rated Capacity | 2015.0 REVOLUTIONS PER MINUTE |
| Drive Shaft Type | SPLINED, STRAIGHT EXTERNAL |
| Discharge Pressure | 500.0 COMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - CEMENT AND CONCRETE CONTAINING CENOSPHERES |
| Maximum Discharge Flow Rate | 2.3 GALLONS PER MINUTE AND 0.5 GALLONS PER MINUTE |
| Rotary Pump Design | GEAR |
| Media for Which Designed | OIL |
| Pump Rotation Direction | COUNTERCLOCKWISE |
| 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 |
|---|---|
| 4813903 PRIMARY | Kalmar AC Inc (USA) |
NSN 4320-00-451-4557 is a Pump,rotary, manufactured by Kalmar AC Inc, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-451-4557 has 1 manufacturer part number on file: 4813903 (Kalmar AC Inc).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-131-5792. Verify interchangeability with system specifications before substitution.
Key specifications for 4813903: Operating Speed at Rated Capacity: 2015.0 REVOLUTIONS PER MINUTE; Drive Shaft Type: SPLINED, STRAIGHT EXTERNAL; Discharge Pressure: 500.0 COMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - CEMENT AND CONCRETE CONTAINING CENOSPHERES; Maximum Discharge Flow Rate: 2.3 GALLONS PER MINUTE AND 0.5 GALLONS PER MINUTE. 7 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.