The Ring,wearing, cataloged under National Stock Number 4320-00-398-5477, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Euramco Safety Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-398-5477 |
| Primary Part Number | 55-22306-18 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Euramco Safety Inc |
| Status | ACTIVE |
| Center Flange Thickness | 0.242 INCHES NOMINAL IN |
| Corner Shape | SQUARE ALL CORNERS |
| Body Style | EXTERNAL LOCKING FLANGE |
| Body Outside Diameter | 4.997 INCHES NOMINAL IN |
| End to Flange Distance | 0.320 INCHES NOMINAL IN |
| Body Inside Diameter | 4.490 INCHES NOMINAL IN |
| Smallest External Anchor Flange Radius | 2.498 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| Largest External Anchor Flange Radius | 2.758 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 |
|---|---|
| 55-22306-18 | Euramco Safety Inc (USA) |
| Reference | Meaning |
|---|---|
| 08-984-862-00-003 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4320-00-398-5477 is a Ring,wearing, manufactured by Euramco Safety Inc, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-398-5477 has 1 manufacturer part number on file: 55-22306-18 (Euramco Safety Inc).
Key specifications for 55-22306-18: Center Flange Thickness: 0.242 INCHES NOMINAL IN; Corner Shape: SQUARE ALL CORNERS; Body Style: EXTERNAL LOCKING FLANGE; Body Outside Diameter: 4.997 INCHES NOMINAL IN. 9 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.