The Ring,wearing, cataloged under National Stock Number 4320-01-423-6503, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4320-01-423-6503 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Status | ACTIVE |
| Body Outside Diameter | 4.125 INCHES NOMINAL IN |
| Material Document and Classification | ASTM B505,ALLOY 910 ASSN STD SINGLE MATERIAL RESPONSE |
| Body Inside Diameter | 3.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY 910 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| PL.2VSHSM-2 ITEM 9 | 5/2 Secondary reference U.S. Government activity |
| 9-0569-01 | 3/2 Design control — primary reference U.S. Government activity |
| NA1793 | D/9 Drawing number reference only U.S. Government activity |
| NAA1813 | D/9 Drawing number reference only U.S. Government activity |
NSN 4320-01-423-6503 is a Ring,wearing, classified under FSC 4320, Power and Hand Pumps. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4320-01-423-6528. Verify interchangeability with system specifications before substitution.
Key specifications for 4320-01-423-6503: Body Outside Diameter: 4.125 INCHES NOMINAL IN; Material Document and Classification: ASTM B505,ALLOY 910 ASSN STD SINGLE MATERIAL RESPONSE; Overall Length: 0.500 INCHES NOMINAL IN; Body Inside Diameter: 3.500 INCHES NOMINAL IN. 4 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.