The Ring,wearing, cataloged under National Stock Number 4320-01-080-1663, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Oberdorfer Foundries Inc. Government technical data includes 3 specifications, 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 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 | 4320-01-080-1663 |
| Primary Part Number | A6635 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Oberdorfer Foundries Inc |
| Status | ACTIVE |
| Body Outside Diameter | 2.465 INCHES NOMINAL IN |
| Body Inside Diameter | 1.015 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| A6635 PRIMARY | Oberdorfer Foundries Inc (USA) |
NSN 4320-01-080-1663 is a Ring,wearing, manufactured by Oberdorfer Foundries Inc, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-080-1663 has 1 manufacturer part number on file: A6635 (Oberdorfer Foundries Inc).
1 possible match (shared part number, not a government interchangeability claim): 2520-01-366-3876. Verify interchangeability with system specifications before substitution.
Key specifications for A6635: Body Outside Diameter: 2.465 INCHES NOMINAL IN; Body Inside Diameter: 1.015 INCHES NOMINAL IN; Material: COPPER ALLOY. 3 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.
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.