The Piston,pump, cataloged under National Stock Number 4320-01-490-1289, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4320-01-490-1289 |
| Primary Part Number | 581-6726888 FIND 15 |
| Item Name | Piston,pump |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Ring Groove Width | 0.188 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Integral Connecting Rod | NOT INCLUDED |
| Retaining Ring Groove | NOT INCLUDED |
| Surface Finish | FINISHED |
| Diameter | 1.488 INCHES MINIMUM AND 1.489 INCHES MAXIMUM IN |
| Ring Groove Diameter | 1.246 INCHES MINIMUM AND 1.248 INCHES MAXIMUM IN |
| Pin | NOT INCLUDED |
| Oil Groove | NOT INCLUDED |
| Head Style | FLAT |
| Ring Groove Quantity | 1 |
| Skirt Bottom Cutaway Feature | NOT INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | NOT INCLUDED |
| Pin Hole Bushing | NOT INCLUDED |
| Material | NICKEL ALLOY |
| Skirt Type | SOLID |
| 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 |
|---|---|
| 581-6726888 FIND 15 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 581-6726888 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4320-01-490-1289 is a Piston,pump, manufactured by Naval Sea Systems Command, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-490-1289 has 1 manufacturer part number on file: 581-6726888 FIND 15 (Naval Sea Systems Command).
Key specifications for 581-6726888 FIND 15: Overall Height: 1.500 INCHES NOMINAL IN; Ring Groove Width: 0.188 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN; Integral Connecting Rod: NOT INCLUDED; Retaining Ring Groove: NOT INCLUDED. 16 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.