The Piston,compressor, cataloged under National Stock Number 4310-00-879-7809, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Atlas Copco Holyoke Inc. Government technical data includes 24 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4310-00-879-7809 |
| Primary Part Number | PST423A |
| Item Name | Piston,compressor |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Atlas Copco Holyoke Inc |
| Status | ACTIVE |
| FSC Application Data | COMPRESSOR,RECIPROCATING,POWER DRIVEN,SHOP EQUIPMENT,GENERAL PURPOSE REPAIR |
| Ring Groove Width | 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM AND 0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN |
| Distance Between Pin Bosses | 1.625 INCHES NOMINAL IN |
| Integral Connecting Rod | NOT INCLUDED |
| Retaining Ring Groove | INCLUDED |
| Surface Finish | FINISHED |
| Ring Groove Position and Quantity | NO.3,NO.4,NO.1,NO.2 PISTON |
| Oil Passage Type | HOLE |
| Diameter | 3.500 INCHES NOMINAL IN |
| Ring Groove Diameter | 3.147 INCHES MINIMUM AND 3.107 INCHES MAXIMUM IN |
| Distance From Pin Hole Center to Extreme Top | 2.123 INCHES MINIMUM AND 2.127 INCHES MAXIMUM IN |
| Pin | INCLUDED |
| Pin Type for Which Designed | LOCKED |
| Oil Groove | NOT INCLUDED |
| Head Style | FLAT |
| Ring Groove Quantity | 4 |
| Skirt Bottom Cutaway Feature | INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | NOT INCLUDED |
| Pinhole Diameter | 1.2500 INCHES MINIMUM AND 1.2502 INCHES MAXIMUM IN |
| Pin Hole Bushing | NOT INCLUDED |
| Material | ALUMINUM ALLOY |
| Skirt Type | SOLID |
| Cut Depth | 0.375 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 |
|---|---|
| PST423A PRIMARY | Atlas Copco Holyoke Inc (USA) |
| Reference | Meaning |
|---|---|
| PST423A | 5/9 Secondary reference U.S. Government activity |
NSN 4310-00-879-7809 is a Piston,compressor, manufactured by Atlas Copco Holyoke Inc, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-00-879-7809 has 1 manufacturer part number on file: PST423A (Atlas Copco Holyoke Inc).
Key specifications for PST423A: Overall Height: 4.123 INCHES MINIMUM AND 4.127 INCHES MAXIMUM IN; FSC Application Data: COMPRESSOR,RECIPROCATING,POWER DRIVEN,SHOP EQUIPMENT,GENERAL PURPOSE REPAIR; Ring Groove Width: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM AND 0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN; Distance Between Pin Bosses: 1.625 INCHES NOMINAL IN. 24 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.