The Shaft,straight, cataloged under National Stock Number 3040-01-121-1911, 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15 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-121-1911 |
| Item Name | Shaft,straight |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| First End Width Across Flats | 0.242 INCHES NOMINAL IN |
| First End Diameter | 0.3080 INCHES NOMINAL IN |
| First End Step Length | 0.360 INCHES NOMINAL IN |
| Second End Diameter | 0.3080 INCHES NOMINAL IN |
| Second End Distance From Keyway Center to End | 0.268 INCHES NOMINAL IN |
| First End Style | SQUARE (ROUND CORNERS) |
| Second End Keyway Width | 0.0930 INCHES NOMINAL IN |
| Material Document and Classification | QQ-S-763 CLASS 304,COND A FED SPEC SINGLE MATERIAL RESPONSE |
| Second End Groove Diameter | 0.2030 INCHES NOMINAL IN |
| End Similarity | NOT IDENTICAL |
| Second End Groove Width | 0.2000 INCHES NOMINAL IN |
| Second End Distance From End to Groove | 0.168 INCHES NOMINAL IN |
| Second End Style | WOODRUFF KEYWAY AND CIRCULAR GROOVED |
| Material | STEEL COMP 304 |
| External Keyway Length | 0.356 INCHES NOMINAL SECOND END IN |
| 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 |
|---|---|
| 803-4384431-A-080 | 3/2 Design control — primary reference U.S. Government activity |
| 810-4384431-A-37 | 5/9 Secondary reference U.S. Government activity |
| 810-4384431 | D/9 Drawing number reference only U.S. Government activity |
| 803-4384431 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-121-1911 is a Shaft,straight, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-126-9847, 5315-01-144-2404, 4820-01-145-5650. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-121-1911: First End Width Across Flats: 0.242 INCHES NOMINAL IN; First End Diameter: 0.3080 INCHES NOMINAL IN; First End Step Length: 0.360 INCHES NOMINAL IN; Second End Diameter: 0.3080 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.