The Ring,valve Piston, cataloged under National Stock Number 4820-01-374-4318, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-374-4318 |
| Item Name | Ring,valve Piston |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| General Characteristics Item Description | SPLIT RING; PLAIN SQUARE CROSS-SECTION |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 687519 | C/1 Advisory reference — outside the item-of-supply concept Eaton Aerospace, Llc Dba Jackson South |
| 687519 | 3/9 Design control — primary reference Vickers Inc |
NSN 4820-01-374-4318 is a Ring,valve Piston, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5330-01-457-9267. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-374-4318: General Characteristics Item Description: SPLIT RING; PLAIN SQUARE CROSS-SECTION; Special Features: MATL: NYLON (PA11 OR PA12); 56MM DIA X 2MM MM; End Item Identification: STAFFA HYDRAULIC MOTOR MODEL HMB-010 SERIES. 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.