The Ring,wearing, cataloged under National Stock Number 4320-00-950-9307, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Epd. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-950-9307 |
| Primary Part Number | 121457 |
| Item Name | Ring,wearing |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES LEFT FACE |
| Surface Finish | 125.0 MICROINCHES INSIDE |
| Surface Finish | 125.0 MICROINCHES RIGHT FACE |
| Surface Finish | 20.0 MICROINCHES OUTSIDE |
| Corner Shape | CHAMFERED INSIDE LEFT CORNER |
| Corner Shape | SQUARE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE LEFT CORNER |
| Corner Shape | CHAMFERED INSIDE RIGHT CORNER |
| Chamfer Length | 0.062 INCHES NOMINAL INSIDE RIGHT CORNER IN |
| Chamfer Length | 0.094 INCHES NOMINAL INSIDE LEFT CORNER IN |
| Body Style | PLAIN |
| Body Outside Diameter | 4.129 INCHES MINIMUM AND 4.131 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763,CLASS 410,COND A FED SPEC SINGLE MATERIAL RESPONSE |
| Body Inside Diameter | 3.750 INCHES MINIMUM AND 3.751 INCHES MAXIMUM IN |
| Chamfer Angle | 45.0 DEGREES NOMINAL INSIDE RIGHT CORNER |
| Chamfer Angle | 45.0 DEGREES NOMINAL INSIDE LEFT CORNER |
| Material | STEEL |
| 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 |
|---|---|
| 121457 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| 121457 | Toolex, Inc Dba Toolex Inc (USA) |
| Reference | Meaning |
|---|---|
| H4320-950-9307 | 5/9 Secondary reference Regent Sports Corp |
| R121457 | 5/9 Secondary reference Rotary Products Inc |
NSN 4320-00-950-9307 is a Ring,wearing, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Epd, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-950-9307 has 2 manufacturer part numbers on file: 121457 (Curtiss-Wright Electro-Mechanical Corporation Div Epd), 121457 (Toolex, Inc Dba Toolex Inc).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-310-2365. Verify interchangeability with system specifications before substitution.
Key specifications for 121457: Surface Finish: 125.0 MICROINCHES LEFT FACE; Surface Finish: 125.0 MICROINCHES INSIDE; Surface Finish: 125.0 MICROINCHES RIGHT FACE; Surface Finish: 20.0 MICROINCHES OUTSIDE. 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.