The Ring,valve Piston, cataloged under National Stock Number 4820-01-372-6581, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Kawasaki Motors Corp Usa Dba Kawasaki Motor Cycle Division Div Kawasaki Gas Turbines-Americas. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-372-6581 |
| Primary Part Number | 687541 |
| Item Name | Ring,valve Piston |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Kawasaki Motors Corp Usa Dba Kawasaki Motor Cycle Division Div Kawasaki Gas Turbines-Americas |
| Status | ACTIVE |
| General Characteristics Item Description | MATERIAL IS STEEL; 12 RINGS REQUIRED |
| 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 |
|---|---|
| 687541 PRIMARY | Kawasaki Motors Corp Usa Dba Kawasaki Motor Cycle Division Div Kawasaki Gas Turbines-Americas (USA) |
| Reference | Meaning |
|---|---|
| 687541 | 5/9 Secondary reference Eaton Aerospace, Llc Dba Jackson South |
NSN 4820-01-372-6581 is a Ring,valve Piston, manufactured by Kawasaki Motors Corp Usa Dba Kawasaki Motor Cycle Division Div Kawasaki Gas Turbines-Americas, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-372-6581 has 1 manufacturer part number on file: 687541 (Kawasaki Motors Corp Usa Dba Kawasaki Motor Cycle Division Div Kawasaki Gas Turbines-Americas).
1 possible match (shared part number, not a government interchangeability claim): 3010-01-476-1297. Verify interchangeability with system specifications before substitution.
Key specifications for 687541: General Characteristics Item Description: MATERIAL IS STEEL; 12 RINGS REQUIRED; Special Features: RINGS FIT AROUND VALVE SPOOL; ONE INSIDE EDGE OF RING IS CHAMFERED; 2 RINGS PER GROOVE IN VALVE SPOOL; End Item Identification: FIVE PISTON HYDRAULIC MOTOR,VICKERS AEROSPACE,MARINE AND DEFENSE,MODEL HMB030-P. 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.