The Ring,wearing, cataloged under National Stock Number 4320-01-381-3899, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 12 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-381-3899 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES ALL SURFACES |
| Corner Shape | SQUARE INSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE LEFT CORNER |
| Corner Shape | SQUARE INSIDE LEFT CORNER |
| Corner Shape | CHAMFERED OUTSIDE RIGHT CORNER |
| Chamfer Length | 0.060 INCHES NOMINAL OUTSIDE RIGHT CORNER IN |
| Body Style | PLAIN W/INTERNAL FLANGE |
| Body Outside Diameter | 17.749 INCHES NOMINAL IN |
| Unthreaded Mounting Hole Diameter | 0.312 INCHES NOMINAL IN |
| Material Document and Classification | ASTM B367, GR. C-2 ASSN STD SINGLE MATERIAL RESPONSE |
| Internal Flange Inside Diameter | 15.250 INCHES NOMINAL IN |
| Body Inside Diameter | 17.056 INCHES NOMINAL IN |
| Bolt Hole Quantity | 6 |
| Bolt Circle Diameter | 16.125 INCHES NOMINAL IN |
| Chamfer Angle | 30.0 DEGREES NOMINAL OUTSIDE RIGHT CORNER |
| Material | STEEL |
| Internal Flange Width | 0.600 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 |
| Reference | Meaning |
|---|---|
| 12253D18 ITEM 6 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| 12089F18-6 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| 12253D18 | D/9 Drawing number reference only U.S. Government activity |
| 12089F18-6 | 5/9 Secondary reference U.S. Government activity |
| 12089F18 | D/9 Drawing number reference only U.S. Government activity |
| 12260D18 | 5/9 Secondary reference U.S. Government activity |
| 12089F18 ITEM 6 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| 12089F18 ITEM 6 | 5/9 Secondary reference U.S. Government activity |
| 12253D18 ITEM 6 | 5/9 Secondary reference U.S. Government activity |
| 1700D6B | 3/9 Design control — primary reference U.S. Government activity |
| 1700D6B | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| 12260D18 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
NSN 4320-01-381-3899 is a Ring,wearing, classified under FSC 4320, Power and Hand Pumps. Status: active.
Key specifications for 4320-01-381-3899: Surface Finish: 125.0 MICROINCHES ALL SURFACES; Corner Shape: SQUARE INSIDE 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.