The Ring Set,piston, cataloged under National Stock Number 4310-00-858-0109, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Epd. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4310-00-858-0109 |
| Primary Part Number | 2958P |
| Item Name | Ring Set,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| Status | ACTIVE |
| Ring Set Component Parts | INNER RING,STEEL,W/DIAGONAL JOINT,1; OUTER RING,BRASS,W/INTERLOCK JOINT,1 |
| Piston Accommodation Quantity | 1 |
| Standard Bore Diameter | 6.438 INCHES 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 |
|---|---|
| 2958P PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| Reference | Meaning |
|---|---|
| 2958P | 3/9 Design control — primary reference U.S. Government activity |
NSN 4310-00-858-0109 is a Ring Set,piston, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Epd, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-00-858-0109 has 1 manufacturer part number on file: 2958P (Curtiss-Wright Electro-Mechanical Corporation Div Epd).
Key specifications for 2958P: Ring Set Component Parts: INNER RING,STEEL,W/DIAGONAL JOINT,1; OUTER RING,BRASS,W/INTERLOCK JOINT,1; Piston Accommodation Quantity: 1; Standard Bore Diameter: 6.438 INCHES IN. 3 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.