The Piston,accumulator, cataloged under National Stock Number 4320-00-003-5634, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-003-5634 |
| Primary Part Number | 2491649 |
| Item Name | Piston,accumulator |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| General Characteristics Item Description | 3.990 IN. W O/A,PISTON 1.092 IN. DIA,MAX,ALUMINUM,ANODIZED AND ANODIC TREATED MILA8625 TYPE 1 IN |
| 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 |
|---|---|
| 2491649 PRIMARY | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| Reference | Meaning |
|---|---|
| 2491649 | 5/2 Secondary reference U.S. Government activity |
| 2483545 | 5/2 Secondary reference U.S. Government activity |
NSN 4320-00-003-5634 is a Piston,accumulator, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-003-5634 has 1 manufacturer part number on file: 2491649 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us).
Key specifications for 2491649: General Characteristics Item Description: 3.990 IN. W O/A,PISTON 1.092 IN. DIA,MAX,ALUMINUM,ANODIZED AND ANODIC TREATED MILA8625 TYPE 1 IN. 1 specification is 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.