The Piston,linear Actuating Cylinder, cataloged under National Stock Number 3040-01-189-2173, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-189-2173 |
| Item Name | Piston,linear Actuating Cylinder |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Outside Diameter | 2.375 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 209-2047974 PIECE 4 | 5/2 Secondary reference U.S. Government activity |
| 209-2047974 | D/9 Drawing number reference only U.S. Government activity |
| 71721-21X5 | D/9 Drawing number reference only U.S. Government activity |
| 71721-21X5 PIECE 4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3040-01-189-2173 is a Piston,linear Actuating Cylinder, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-189-6632, 3040-01-190-5926. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-189-2173: Outside Diameter: 2.375 INCHES NOMINAL IN; Overall Length: 15.375 INCHES NOMINAL IN; Special Features: ALUMINUM BRONZE PER QQ-B-679,COMP 2; Material: ALUMINUM ALLOY. 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.