The Shaft,straight, cataloged under National Stock Number 3040-01-068-6688, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-068-6688 |
| Item Name | Shaft,straight |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Second End Hole Diameter | 0.3750 INCHES NOMINAL IN |
| First End Diameter | 1.0000 INCHES NOMINAL IN |
| First End Distance From Keyway Center to End | 1.187 INCHES NOMINAL IN |
| Second End Diameter | 1.0000 INCHES NOMINAL IN |
| First End Style | WOODRUFF KEYWAY |
| Second End Distance From Hole Center to End | 1.250 INCHES NOMINAL IN |
| Second End Hole Depth | 1.000 INCHES NOMINAL IN |
| End Similarity | NOT IDENTICAL |
| Second End Style | UNTHREADED CROSS DRILLED |
| Material | STEEL |
| First End Keyway Width | 0.2500 INCHES NOMINAL 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 |
|---|---|
| C159-1 | 3/9 Design control — primary reference Saf-Holland, Inc. |
NSN 3040-01-068-6688 is a Shaft,straight, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5905-01-146-4350, 5910-01-205-1525. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-068-6688: Second End Hole Diameter: 0.3750 INCHES NOMINAL IN; First End Diameter: 1.0000 INCHES NOMINAL IN; First End Distance From Keyway Center to End: 1.187 INCHES NOMINAL IN; Second End Diameter: 1.0000 INCHES NOMINAL IN. 11 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.