The Shaft,straight, cataloged under National Stock Number 3040-01-237-6258, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-237-6258 |
| Item Name | Shaft,straight |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES |
| First End Diameter | 1.2470 INCHES NOMINAL IN |
| First End Spline Major Diameter | 1.2470 INCHES NOMINAL IN |
| Second End Diameter | 1.2470 INCHES NOMINAL IN |
| Second End Spline Minor Diameter | 1.0665 INCHES NOMINAL IN |
| First End Style | SPLINED (STRAIGHT) |
| Second End Spline Major Diameter | 1.2470 INCHES NOMINAL IN |
| Material Document and Classification | AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE |
| First End Spline Length | 1.688 INCHES NOMINAL IN |
| First End Spline Quantity | 10 |
| End Similarity | NOT IDENTICAL |
| Second End Spline Quantity | 10 |
| Second End Style | SPLINED (STRAIGHT) |
| First End Spline Minor Diameter | 1.0665 INCHES NOMINAL IN |
| Material | STEEL COMP 4140 |
| Second End Spline Length | 2.625 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 |
|---|---|
| SSN637-701-2159985 | D/9 Drawing number reference only U.S. Government activity |
| SSN637-701-2159985 PIECE 5 | 5/2 Secondary reference U.S. Government activity |
| 77832-60X9 | D/9 Drawing number reference only U.S. Government activity |
| 77832-60X9 PIECE 5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3040-01-237-6258 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): 3040-01-237-6259, 3040-01-237-6290. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-237-6258: Surface Finish: 32.0 MICROINCHES; First End Diameter: 1.2470 INCHES NOMINAL IN; First End Spline Major Diameter: 1.2470 INCHES NOMINAL IN; Second End Diameter: 1.2470 INCHES NOMINAL IN. 16 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.