The Pump,reciprocating,direct Acting, cataloged under National Stock Number 4320-01-529-4564, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 5 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. Current acquisition status: Active.
| Item Name | Pump,reciprocating,direct Acting |
| FSC / FSG | 4320 — Power and Hand Pumps (FSG 43) |
| Manufacturers | Mcmaster-Carr Supply Co (CAGE 39428) |
| Parameter | Value |
|---|---|
| NSN | 4320-01-529-4564 |
| Primary Part Number | 4257K21 |
| Item Name | Pump,reciprocating,direct Acting |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Pumping Element Type | PISTON |
| Pump Reciprocating Design | SINGLE ACTING |
| Discharge Pressure | 0.0 COMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - CEMENT AND CONCRETE CONTAINING SILICA FUME AND 50.0 COMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - CEMENT AND CONCRETE CONTAINING CENOSPHERES |
| Maximum Discharge Flow Rate | 14.0 GALLONS PER MINUTE |
| Media for Which Designed | HYDRAULIC FLUID AND ETHYLENE GLYCOL |
| 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 |
|---|---|
| 4257K21 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 4320-01-529-4564 is a Pump,reciprocating,direct Acting, manufactured by Mcmaster-Carr Supply Co, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-529-4564 has 1 manufacturer part number on file: 4257K21 (Mcmaster-Carr Supply Co).
Key specifications for 4257K21: Pumping Element Type: PISTON; Pump Reciprocating Design: SINGLE ACTING; Discharge Pressure: 0.0 COMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - CEMENT AND CONCRETE CONTAINING SILICA FUME AND 50.0 COMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - CEMENT AND CONCRETE CONTAINING CENOSPHERES; Special Features: WITHOUT CURVED SPOUT. 5 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.