The Ring,wearing, cataloged under National Stock Number 4320-00-657-4172, 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 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4320-00-657-4172 |
| Primary Part Number | CS4320-0331 |
| 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 |
| Center Flange Thickness | 0.172 INCHES MINIMUM AND 0.177 INCHES MAXIMUM 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 | 0.090 INCHES NOMINAL INSIDE RIGHT CORNER IN |
| Body Style | EXTERNAL LOCKING FLANGE |
| Body Outside Diameter | 5.623 INCHES MINIMUM AND 5.624 INCHES MAXIMUM IN |
| End to Flange Distance | 0.440 INCHES NOMINAL IN |
| Internal Flange Inside Diameter | 4.500 INCHES NOMINAL IN |
| Distance Below Centerline | 0.062 INCHES NOMINAL IN |
| Body Inside Diameter | 5.261 INCHES MINIMUM AND 5.263 INCHES MAXIMUM IN |
| Smallest External Anchor Flange Radius | 2.938 INCHES NOMINAL IN |
| Chamfer Angle | 30.0 DEGREES NOMINAL INSIDE RIGHT CORNER |
| Material | NICKEL ALLOY |
| Internal Flange Width | 0.620 INCHES NOMINAL IN |
| Largest External Anchor Flange Radius | 3.125 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 |
|---|---|
| CS4320-0331 PRIMARY | Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) (USA) |
| Reference | Meaning |
|---|---|
| NA1144-1 | 5/9 Secondary reference U.S. Government activity |
NSN 4320-00-657-4172 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 4320-00-657-4172 has 1 manufacturer part number on file: CS4320-0331 (Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings)).
Key specifications for CS4320-0331: Center Flange Thickness: 0.172 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN; Corner Shape: SQUARE OUTSIDE RIGHT CORNER; Corner Shape: SQUARE OUTSIDE LEFT CORNER; Corner Shape: SQUARE INSIDE LEFT CORNER. 17 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.