The Shaft,straight, cataloged under National Stock Number 3040-01-124-3789, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-124-3789 |
| Item Name | Shaft,straight |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES |
| Second End Hole Diameter | 0.2800 INCHES NOMINAL IN |
| First End Diameter | 0.7500 INCHES NOMINAL IN |
| First End Distance From Keyway Center to End | 0.810 INCHES NOMINAL IN |
| Second End Diameter | 0.7500 INCHES NOMINAL IN |
| Second End Step Length | 1.000 INCHES NOMINAL IN |
| First End Style | INDENTED FLAT KEYWAY AND CROSS DRILLED HOLE |
| Material Document and Classification | QQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE |
| First End Keyway Depth | 0.106 INCHES MINIMUM AND 0.121 INCHES MAXIMUM IN |
| Second End Distance From Hole Center to End | 0.630 INCHES NOMINAL IN |
| Second End Hole Depth | 0.560 INCHES MINIMUM AND 0.561 INCHES MAXIMUM IN |
| End Similarity | NOT IDENTICAL |
| First End Hole Diameter | 0.2800 INCHES NOMINAL IN |
| Second End Style | SQUARE AND CROSS DRILLED HOLE |
| Material | STEEL COMP 304 |
| Second End Width Across Flats | 0.560 INCHES MINIMUM AND 0.561 INCHES MAXIMUM IN |
| External Keyway Length | 1.380 INCHES NOMINAL FIRST END IN |
| First End Keyway Width | 0.1880 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM 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 |
|---|---|
| 709-4684922 ITEM 39 | 5/2 Secondary reference U.S. Government activity |
| 87832-1651 ITEM 39 | 3/2 Design control — primary reference U.S. Government activity |
| 87832-1651 | D/9 Drawing number reference only U.S. Government activity |
| 709-4684922 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-124-3789 is a Shaft,straight, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
6 possible matches (shared part number, not a government interchangeability claim): 3010-01-124-3926, 3040-01-151-5633, 3040-01-152-3065. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-124-3789: Surface Finish: 63.0 MICROINCHES; Second End Hole Diameter: 0.2800 INCHES NOMINAL IN; First End Diameter: 0.7500 INCHES NOMINAL IN; First End Distance From Keyway Center to End: 0.810 INCHES NOMINAL IN. 18 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.