The Pump Unit,centrifugal, cataloged under National Stock Number 4320-01-055-7276, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is W.w. Grainger, Inc. Div Government Sales Division. Government technical data includes 30 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-055-7276 |
| Primary Part Number | 4RH55 |
| Item Name | Pump Unit,centrifugal |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | W.w. Grainger, Inc. Div Government Sales Division |
| Status | ACTIVE |
| Discharge Connection Quantity | 1 |
| Phase | SINGLE |
| Intake Connection Type | THREADED INTERNAL |
| Frequency in Hertz | 60.0 |
| Inclosure Type | FULLY INCLOSED |
| Current Type | AC |
| Pumping Element Operating Position | HORIZONTAL |
| Prime Mover Power Rating | 0.333 HORSEPOWER |
| Unpackaged Unit Length | 12.750 INCHES NOMINAL IN |
| Centrifugal Pump Impeller Quantity | 1 |
| Voltage in Volts | 115.0 |
| Cooling Method | SELF VENTILATED |
| Prime Mover Quantity | 1 |
| Centrifugal Pump Impeller Suction Type | SINGLE |
| Operating Speed at Rated Capacity | 3450.0 REVOLUTIONS PER MINUTE |
| Pump Quantity | 1 |
| Unpackaged Unit Width | 6.5000 INCHES NOMINAL IN |
| Discharge Connection Thread Size and Series/type Designator | 0.500-14 NPT |
| Prime Mover Cooling Medium | AIR |
| Intake Connection Thread Size and Series/type Designator | 0.750-14 NPT |
| Unpackaged Unit Height | 6.438 INCHES NOMINAL IN |
| Stage Quantity | 1 |
| Environmental Protection | DRIPPROOF |
| Maximum Discharge Flow Rate | 32.0 GALLONS PER MINUTE AND 12.0 GALLONS PER MINUTE |
| Discharge Connection Type | THREADED INTERNAL |
| Intake Connection Quantity | 1 |
| Material | IRON PUMP BASIC |
| Prime Mover Type | ELECTRIC MOTOR |
| Media for Which Designed | LIQUID |
| Mounting Type | BASE |
| 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 |
|---|---|
| 4RH55 PRIMARY | W.w. Grainger, Inc. Div Government Sales Division (USA) |
| Reference | Meaning |
|---|---|
| 1P831 | 5/9 Secondary reference W.w. Grainger, Inc. Div Government Sales Division |
NSN 4320-01-055-7276 is a Pump Unit,centrifugal, manufactured by W.w. Grainger, Inc. Div Government Sales Division, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-055-7276 has 1 manufacturer part number on file: 4RH55 (W.w. Grainger, Inc. Div Government Sales Division).
Key specifications for 4RH55: Discharge Connection Quantity: 1; Phase: SINGLE; Intake Connection Type: THREADED INTERNAL; Frequency in Hertz: 60.0. 30 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.