The Shaft,shouldered, cataloged under National Stock Number 3040-01-255-6201, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-255-6201 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Step Quantity | 3 |
| First End Diameter | 0.1870 INCHES NOMINAL IN |
| First End Flat Depth | 0.0310 INCHES NOMINAL IN |
| Second End Diameter | 0.1870 INCHES NOMINAL IN |
| Second End Step Length | 0.500 INCHES NOMINAL IN |
| Largest Step Diameter | 0.305 INCHES NOMINAL IN |
| First End Style | FLATTED |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | QQ-T-570 FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| Second End Style | SQUARE (ROUND CORNERS) |
| First End Flat Length | 0.188 INCHES NOMINAL IN |
| Material | STEEL |
| Second End Width Across Flats | 0.187 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Reference | Meaning |
|---|---|
| 903-5912051 PC42 | 3/9 Design control — primary reference U.S. Government activity |
| 903-5912051 | 5/9 Secondary reference U.S. Government activity |
NSN 3040-01-255-6201 is a Shaft,shouldered, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 3020-01-255-6253, 5355-01-417-1818, 4730-01-442-8582. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-255-6201: Step Quantity: 3; First End Diameter: 0.1870 INCHES NOMINAL IN; First End Flat Depth: 0.0310 INCHES NOMINAL IN; Second End Diameter: 0.1870 INCHES NOMINAL IN. 15 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.