The Piston,hydraulic Accumulator, cataloged under National Stock Number 1650-01-304-5591, is classified within Federal Supply Class 1650 (Aircraft Hydraulic, Vacuum, and De-icing System Components) of the Aircraft Components and Accessories group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1650-01-304-5591 |
| Primary Part Number | 65664-05058-101 |
| Item Name | Piston,hydraulic Accumulator |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 65664-05058-101 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| 65664-05058-101 | Apex Manufacturing Company, Inc. Dba Apex Manufacturing Co (USA) |
| Reference | Meaning |
|---|---|
| 65664-05058 | D/9 Drawing number reference only Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
NSN 1650-01-304-5591 is a Piston,hydraulic Accumulator, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
NSN 1650-01-304-5591 has 2 manufacturer part numbers on file: 65664-05058-101 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), 65664-05058-101 (Apex Manufacturing Company, Inc. Dba Apex Manufacturing Co).
Key specifications for 65664-05058-101: Special Features: ALUMINUM ALLOY; CHROME PLATED STEM PER QQ-C-320,CLASS 2; O/A LG 13.260 IN.; HEAD DIA 1.489 IN.; W/TWO HEAD GROOVES; COUNTERBORE HEAD 0.750 IN. DIA,0.700 IN. DEEP; STEM DIA 0.617 IN.; THD END TIP 0.375-24 UNJF-3A A; End Item Identification: UNITED TECHNOLOGIES SIKORSKY MODEL MH-53E HELICOPTER. 0 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 1650-01-304-5591 has DEMIL Code B. 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.