The Piston,compressor, cataloged under National Stock Number 4130-00-340-1857, is classified within Federal Supply Class 4130 (Refrigeration and Air Conditioning Components) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Hartford Compressors Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4130-00-340-1857 |
| Primary Part Number | CPST23A |
| Item Name | Piston,compressor |
| FSC / FSG | 4130 / 41 — Refrigeration and Air Conditioning Components |
| Manufacturer | Hartford Compressors Inc |
| Status | ACTIVE |
| Ring Groove Width | 0.189 INCHES MAXIMUM IN |
| Distance Between Pin Bosses | 3.339 INCHES NOMINAL IN |
| Integral Connecting Rod | NOT INCLUDED |
| Retaining Ring Groove | INCLUDED |
| Surface Finish | FINISHED |
| Oil Passage Type | HOLE |
| Diameter | 4.238 INCHES MAXIMUM IN |
| Ring Groove Diameter | 3.844 INCHES MAXIMUM AND 3.804 INCHES MAXIMUM IN |
| Distance From Pin Hole Center to Extreme Top | 2.251 INCHES NOMINAL IN |
| Pin | INCLUDED |
| Pin Type for Which Designed | FLOATING |
| Oil Groove | NOT INCLUDED |
| Head Style | FLAT |
| Ring Groove Quantity | 3 |
| Skirt Bottom Cutaway Feature | NOT INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | NOT INCLUDED |
| Bushing Hole Diameter | 1.750 INCHES NOMINAL IN |
| Pin Hole Bushing | INCLUDED |
| Material | ALUMINUM ALLOY |
| Skirt Type | SOLID |
| 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 |
|---|---|
| CPST23A PRIMARY | Hartford Compressors Inc (USA) |
| Reference | Meaning |
|---|---|
| CPST23A | 5/9 Secondary reference Brundage Alfred Co |
| 10MP396 | 5/9 Secondary reference Hartford Compressors Inc |
| 20MP396 | 5/9 Secondary reference Hartford Compressors Inc |
NSN 4130-00-340-1857 is a Piston,compressor, manufactured by Hartford Compressors Inc, classified under FSC 4130, Refrigeration and Air Conditioning Components. Status: active.
NSN 4130-00-340-1857 has 1 manufacturer part number on file: CPST23A (Hartford Compressors Inc).
Key specifications for CPST23A: Overall Height: 4.500 INCHES NOMINAL IN; Ring Groove Width: 0.189 INCHES MAXIMUM IN; Distance Between Pin Bosses: 3.339 INCHES NOMINAL IN; Integral Connecting Rod: NOT INCLUDED. 21 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.