The Ring,wearing, cataloged under National Stock Number 4320-01-369-6520, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is John Crane, Inc. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4320-01-369-6520 |
| Primary Part Number | T520-0068-004-7588 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | John Crane, Inc |
| Status | ACTIVE |
| Corner Shape | SQUARE ALL CORNERS |
| Body Style | PLAIN |
| Body Outside Diameter | 0.812 INCHES NOMINAL IN |
| Body Inside Diameter | 0.688 INCHES NOMINAL IN |
| Material | CARBON GRAPHITE |
| 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 |
|---|---|
| T520-0068-004-7588 PRIMARY | John Crane, Inc (USA) |
| 845-6556347-1 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 845-6556347-1 | 5/9 Secondary reference U.S. Government activity |
| 845-6556347 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4320-01-369-6520 is a Ring,wearing, manufactured by John Crane, Inc, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-369-6520 has 2 manufacturer part numbers on file: T520-0068-004-7588 (John Crane, Inc), 845-6556347-1 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-371-2640. Verify interchangeability with system specifications before substitution.
Key specifications for T520-0068-004-7588: Corner Shape: SQUARE ALL CORNERS; Body Style: PLAIN; Body Outside Diameter: 0.812 INCHES NOMINAL IN; Overall Length: 0.250 INCHES NOMINAL IN. 5 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.