The Ring,piston, cataloged under National Stock Number 4310-01-155-7009, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4310-01-155-7009 |
| Primary Part Number | ST7M342-20 |
| Item Name | Ring,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Material | STEEL CORROSION RESISTING OVERALL |
| 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 |
|---|---|
| ST7M342-20 | The Boeing Company Div Defense (USA) |
| ST7M342-20 | Associated Aircraft Manufacturing & Sales, Inc. Dba Associated Aircraft Manufacturing & Sales Inc (USA) |
| ST7M342-20 | Derco Aerospace, Inc. Dba Derco Aerospace, Inc. a Lockheed Martin Company (USA) |
| ST7M342-20 | Kitco Llc (USA) |
| Reference | Meaning |
|---|---|
| J3-1041 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4310-01-155-7009 is a Ring,piston, manufactured by The Boeing Company Div Defense, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-01-155-7009 has 4 manufacturer part numbers on file: ST7M342-20 (The Boeing Company Div Defense), ST7M342-20 (Associated Aircraft Manufacturing & Sales, Inc. Dba Associated Aircraft Manufacturing & Sales Inc), ST7M342-20 (Derco Aerospace, Inc. Dba Derco Aerospace, Inc. a Lockheed Martin Company), ST7M342-20 (Kitco Llc).
Key specifications for ST7M342-20: Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Material: STEEL CORROSION RESISTING OVERALL. 2 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.