The Ring,wearing, cataloged under National Stock Number 4320-00-398-9502, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Circor Naval Solutions Llc Dba Warren Pumps. Government technical data includes 17 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-398-9502 |
| Primary Part Number | C65A |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Circor Naval Solutions Llc Dba Warren Pumps |
| Status | ACTIVE |
| Corner Shape | SQUARE ALL CORNERS |
| Distance Between Flanges | 0.625 INCHES NOMINAL IN |
| Internal Flange Outside Diameter | 6.625 INCHES NOMINAL IN |
| Body Style | INTERNAL FLANGE W/EXTERNAL LOCKING FLANGE |
| Internal Flange Lip Width | 0.172 INCHES NOMINAL IN |
| Distance From End | 5.750 INCHES NOMINAL IN |
| Body Outside Diameter | 6.250 INCHES NOMINAL IN |
| End to Flange Distance | 0.812 INCHES NOMINAL IN |
| Internal Flange Inside Diameter | 4.750 INCHES NOMINAL IN |
| Left Side Flange Thickness | 0.188 INCHES NOMINAL IN |
| Distance Below Centerline | 0.062 INCHES NOMINAL IN |
| Body Inside Diameter | 5.750 INCHES NOMINAL IN |
| Right Side Flange Thickness | 0.188 INCHES NOMINAL IN |
| Smallest External Anchor Flange Radius | 3.000 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| Internal Flange Width | 0.438 INCHES NOMINAL IN |
| Largest External Anchor Flange Radius | 3.250 INCHES NOMINAL IN |
| 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 |
|---|---|
| C65A PRIMARY | Circor Naval Solutions Llc Dba Warren Pumps (USA) |
| H4320-398-9502 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| BS4-1664PC5 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
| BS5-1881PC5 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
| BS4-1876PC5 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
| BS5-1435PC5 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
| BS4-1430 PIECE 5 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
| BS5-1881-5 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
| BS5-1669PC5 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
NSN 4320-00-398-9502 is a Ring,wearing, manufactured by Circor Naval Solutions Llc Dba Warren Pumps, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-398-9502 has 2 manufacturer part numbers on file: C65A (Circor Naval Solutions Llc Dba Warren Pumps), H4320-398-9502 (Naval Inventory Control Point Mechanicsburg).
Key specifications for C65A: Corner Shape: SQUARE ALL CORNERS; Distance Between Flanges: 0.625 INCHES NOMINAL IN; Internal Flange Outside Diameter: 6.625 INCHES NOMINAL IN; Body Style: INTERNAL FLANGE W/EXTERNAL LOCKING FLANGE. 17 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.