The Ring,piston, cataloged under National Stock Number 3040-01-161-8212, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 7 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-161-8212 |
| Primary Part Number | ST7M342C8P |
| Item Name | Ring,piston |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Material Document and Classification | AMS 5617 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.0450 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 0.580 INCHES IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ST7M342C8P | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| J8-990P | 3/2 Design control — primary reference U.S. Government activity |
| ST7M342C8P | 5/2 Secondary reference U.S. Government activity |
| 3930AS1610-C8P | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| 10106962 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| FR84C8 | 5/9 Secondary reference U.S. Government activity |
NSN 3040-01-161-8212 is a Ring,piston, manufactured by The Boeing Company Div Defense, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-161-8212 has 1 manufacturer part number on file: ST7M342C8P (The Boeing Company Div Defense).
Key specifications for ST7M342C8P: Overall Width: 0.0440 INCHES MINIMUM AND 0.0450 INCHES MAXIMUM IN; Material Document and Classification: AMS 5617 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: VERTICAL JOINT. 7 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.
NSN 3040-01-161-8212 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.