The Ring,wearing, cataloged under National Stock Number 4320-00-212-9502, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings). Government technical data includes 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-212-9502 |
| Primary Part Number | CS4320-0142 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES OUTSIDE |
| Surface Finish | 125.0 MICROINCHES LEFT FACE |
| Surface Finish | 125.0 MICROINCHES INSIDE |
| Surface Finish | 125.0 MICROINCHES RIGHT FACE |
| Flange Diameter | 5.719 INCHES NOMINAL IN |
| Corner Shape | SQUARE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE LEFT CORNER |
| Corner Shape | SQUARE INSIDE LEFT CORNER |
| Corner Shape | CHAMFERED INSIDE RIGHT CORNER |
| Chamfer Length | 0.125 INCHES NOMINAL INSIDE RIGHT CORNER IN |
| Body Style | EXTERNAL FLANGE |
| Body Outside Diameter | 4.498 INCHES MINIMUM AND 4.499 INCHES MAXIMUM IN |
| Unthreaded Mounting Hole Diameter | 0.312 INCHES NOMINAL IN |
| Material Document and Classification | QQ-C-390,ALLOY D3 FED SPEC SINGLE MATERIAL RESPONSE |
| Left Side Flange Thickness | 0.250 INCHES NOMINAL IN |
| Body Inside Diameter | 4.062 INCHES MINIMUM AND 4.063 INCHES MAXIMUM IN |
| Bolt Hole Quantity | 2 |
| Bolt Circle Diameter | 5.125 INCHES NOMINAL IN |
| Chamfer Angle | 45.0 DEGREES NOMINAL INSIDE RIGHT CORNER |
| Material | COPPER 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 |
|---|---|
| AOVNI288US | M.t. Davidson Company (USA) |
| CS4320-0142 PRIMARY | Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) (USA) |
| Reference | Meaning |
|---|---|
| A0VN1288US | 5/9 Secondary reference M.t. Davidson Company |
NSN 4320-00-212-9502 is a Ring,wearing, manufactured by Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings), classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-212-9502 has 2 manufacturer part numbers on file: AOVNI288US (M.t. Davidson Company), CS4320-0142 (Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings)).
Key specifications for CS4320-0142: Surface Finish: 125.0 MICROINCHES OUTSIDE; Surface Finish: 125.0 MICROINCHES LEFT FACE; Surface Finish: 125.0 MICROINCHES INSIDE; Surface Finish: 125.0 MICROINCHES RIGHT FACE. 20 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.