The Ring,wearing, cataloged under National Stock Number 4320-00-075-7440, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Carver Pump Company. Government technical data includes 11 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-075-7440 |
| Primary Part Number | 2HCS251PC22A |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Carver Pump Company |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES INSIDE |
| Surface Finish | 63.0 MICROINCHES LEFT FACE |
| Surface Finish | 63.0 MICROINCHES OUTSIDE |
| Surface Finish | 63.0 MICROINCHES RIGHT FACE |
| Corner Shape | SQUARE ALL CORNERS |
| Body Outside Diameter | 4.234 INCHES NOMINAL IN |
| Material Document and Classification | MIL-I-18397,CLASS A MIL SPEC SINGLE MATERIAL RESPONSE |
| Distance Below Centerline | 0.125 INCHES NOMINAL IN |
| Body Inside Diameter | 3.729 INCHES NOMINAL IN |
| Material | IRON |
| Largest External Anchor Flange Radius | 2.250 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 |
|---|---|
| 2HCS251PC22A | Carver Pump Company (USA) |
| 55-22268-18U/S | Euramco Safety Inc (USA) |
| Reference | Meaning |
|---|---|
| 676-1764-049 | C/1 Advisory reference — outside the item-of-supply concept Aurora Pump a Unit of General Signal Corp |
| 676-1764-262 | 3/9 Design control — primary reference Aurora Pump a Unit of General Signal Corp |
| 676-1764-261 | 5/9 Secondary reference Aurora Pump a Unit of General Signal Corp |
| 2HCS251PC22A | 5/9 Secondary reference General Signal Corp |
| 676-1764-261 | 5/9 Secondary reference General Signal Corp |
| 2HCS251PC22A | 5/9 Secondary reference Aurora Pump a Unit of General Signal Corp |
NSN 4320-00-075-7440 is a Ring,wearing, manufactured by Carver Pump Company, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-075-7440 has 2 manufacturer part numbers on file: 2HCS251PC22A (Carver Pump Company), 55-22268-18U/S (Euramco Safety Inc).
Key specifications for 2HCS251PC22A: Surface Finish: 63.0 MICROINCHES INSIDE; Surface Finish: 63.0 MICROINCHES LEFT FACE; Surface Finish: 63.0 MICROINCHES OUTSIDE; Surface Finish: 63.0 MICROINCHES RIGHT FACE. 11 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.