The Poppet,piston, cataloged under National Stock Number 4820-00-673-1788, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-673-1788 |
| Primary Part Number | 3-956-3 |
| Item Name | Poppet,piston |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL,303,0.500 IN. SQUAR,0.625 IN. HEIGHT 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 |
|---|---|
| 3-956-3 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA) |
| Reference | Meaning |
|---|---|
| 3-956-3 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-673-1788 is a Poppet,piston, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-673-1788 has 1 manufacturer part number on file: 3-956-3 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division).
2 possible matches (shared part number, not a government interchangeability claim): 3020-01-182-7233, 5340-01-546-9949. Verify interchangeability with system specifications before substitution.
Key specifications for 3-956-3: General Characteristics Item Description: STEEL,303,0.500 IN. SQUAR,0.625 IN. HEIGHT 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.