The Sizing Ring,seal,hydraulic Actua, cataloged under National Stock Number 4920-01-642-1238, is classified within Federal Supply Class 4920 (Aircraft Maintenance and Repair Shop Specialized Equipment) of the Maintenance and Repair Shop Equipment group. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Sizing Ring,seal,hydraulic Actua |
| FSC / FSG | 4920 — Aircraft Maintenance and Repair Shop Specialized Equipment (FSG 49) |
| Parameter | Value |
|---|---|
| NSN | 4920-01-642-1238 |
| Item Name | Sizing Ring,seal,hydraulic Actua |
| FSC / FSG | 4920 / 49 — Aircraft Maintenance and Repair Shop Specialized Equipment |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 3833714-2183 | 5/9 Secondary reference U.S. Government activity |
| 3833714-2182 | 5/9 Secondary reference U.S. Government activity |
| 3833714 | D/9 Drawing number reference only U.S. Government activity |
| 3833714-218 | 5/1 Secondary reference Parker-Hannifin Corporation Dba Service and Support Operation Div Services and Support Operations |
| 3833714-2181 | 5/9 Secondary reference U.S. Government activity |
| 3833714-218 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4920-01-642-1238 is a Sizing Ring,seal,hydraulic Actua, classified under FSC 4920, Aircraft Maintenance and Repair Shop Specialized Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4920-01-642-1654. Verify interchangeability with system specifications before substitution.
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 4920-01-642-1238 has DEMIL Code Q. 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.