The Ring,wearing, cataloged under National Stock Number 4320-01-381-3884, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-381-3884 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES OUTSIDE |
| Flange Diameter | 17.500 INCHES NOMINAL IN |
| 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 | INTERNAL AND EXTERNAL FLANGE |
| Body Outside Diameter | 16.249 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 | 14.750 INCHES NOMINAL IN |
| Left Side Flange Thickness | 0.500 INCHES NOMINAL IN |
| Body Inside Diameter | 15.500 INCHES NOMINAL IN |
| Bolt Hole Quantity | 6 |
| Bolt Circle Diameter | 16.750 INCHES NOMINAL IN |
| Chamfer Angle | 30.0 DEGREES NOMINAL OUTSIDE RIGHT CORNER |
| Material | STEEL |
| Internal Flange Width | 0.190 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 |
|---|---|
| 12190D18 ITEM 7 | 5/9 Secondary reference U.S. Government activity |
| 12132F18-7 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| 12132F18-7 | 5/9 Secondary reference U.S. Government activity |
| 1550D7A | 5/9 Secondary reference U.S. Government activity |
| 12132F18 | D/9 Drawing number reference only U.S. Government activity |
| 12190D18A | 3/9 Design control — primary reference U.S. Government activity |
| 12249D18 | 5/9 Secondary reference U.S. Government activity |
| 12190D18A | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| 12190D18 | D/9 Drawing number reference only U.S. Government activity |
NSN 4320-01-381-3884 is a Ring,wearing, classified under FSC 4320, Power and Hand Pumps. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-383-5109, 4320-01-383-5310, 4320-01-384-3195. Verify interchangeability with system specifications before substitution.
Key specifications for 4320-01-381-3884: Surface Finish: 63.0 MICROINCHES OUTSIDE; Flange Diameter: 17.500 INCHES NOMINAL IN; Corner Shape: SQUARE INSIDE RIGHT CORNER; Corner Shape: SQUARE OUTSIDE LEFT CORNER. 19 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.