The Ring,wearing, cataloged under National Stock Number 4320-01-331-6638, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Carver Pump Company. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4320-01-331-6638 |
| Primary Part Number | 676-0003-263 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Carver Pump Company |
| Status | ACTIVE |
| Body Style | EXTERNAL FLANGE |
| Material Document and Classification | QQ-N-288 FED STD SINGLE MATERIAL RESPONSE |
| Material | NICKEL 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 |
|---|---|
| 723-0187-000 PIECE 7 | Carver Pump Company (USA) |
| 676-0003-263 PRIMARY | Carver Pump Company (USA) |
| Reference | Meaning |
|---|---|
| 676-0003-263 | 5/9 Secondary reference Aurora Pump a Unit of General Signal Corp |
| 723-0187-000 | D/9 Drawing number reference only Aurora Pump a Unit of General Signal Corp |
NSN 4320-01-331-6638 is a Ring,wearing, manufactured by Carver Pump Company, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-331-6638 has 2 manufacturer part numbers on file: 723-0187-000 PIECE 7 (Carver Pump Company), 676-0003-263 (Carver Pump Company).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-331-8848. Verify interchangeability with system specifications before substitution.
Key specifications for 676-0003-263: Body Style: EXTERNAL FLANGE; Material Document and Classification: QQ-N-288 FED STD SINGLE MATERIAL RESPONSE; End Item Identification: BILGE PUMP,AURORA PUMP CO,MDL 361 SIZE 1-1/2X2X9; Material: NICKEL 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.