The Piston,pump, cataloged under National Stock Number 4320-01-161-0656, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-161-0656 |
| Item Name | Piston,pump |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Status | ACTIVE |
| FSC Application Data | CONSTANT SPEED DRIVE,P/N 731114A ON KC135R ACFT A |
| Ring Groove Width | 0.180 INCHES NOMINAL IN |
| Integral Connecting Rod | NOT INCLUDED |
| Retaining Ring Groove | NOT INCLUDED |
| Surface Finish | SEMIFINISHED |
| Ring Groove Position and Quantity | NO. 1 POSITION PISTON |
| Oil Passage Type | HOLE |
| Diameter | 1.343 INCHES NOMINAL IN |
| Ring Groove Diameter | 1.186 INCHES NOMINAL IN |
| Pin | NOT INCLUDED |
| Oil Groove | NOT INCLUDED |
| Head Style | FLAT |
| Ring Groove Quantity | 1 |
| Skirt Bottom Cutaway Feature | NOT INCLUDED |
| Ring | NOT INCLUDED |
| Pin Hole Bushing | NOT INCLUDED |
| Material | STEEL |
| Skirt Type | SOLID |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 725947 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4320-01-161-0656 is a Piston,pump, classified under FSC 4320, Power and Hand Pumps. Status: active.
Key specifications for 4320-01-161-0656: Overall Height: 2.018 INCHES NOMINAL IN; FSC Application Data: CONSTANT SPEED DRIVE,P/N 731114A ON KC135R ACFT A; Ring Groove Width: 0.180 INCHES NOMINAL IN; Integral Connecting Rod: NOT INCLUDED. 18 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.
NSN 4320-01-161-0656 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.