The Shaft,shouldered, cataloged under National Stock Number 3040-01-121-9535, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-121-9535 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES |
| Step Quantity | 6 |
| First End Diameter | 1.5747 INCHES MINIMUM AND 1.5752 INCHES MAXIMUM IN |
| Second End Diameter | 1.4960 INCHES MINIMUM AND 1.4980 INCHES MAXIMUM IN |
| Largest Step Diameter | 1.810 INCHES NOMINAL IN |
| Second End Distance From Keyway Center to End | 1.190 INCHES MINIMUM AND 1.195 INCHES MAXIMUM IN |
| First End Style | CIRCULAR GROOVED |
| Second End Keyway Width | 0.3750 INCHES MINIMUM AND 0.3770 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-1222,TYPE 1,SYM 87 MIL SPEC SINGLE MATERIAL RESPONSE |
| Second End Keyway Depth | 0.191 INCHES NOMINAL IN |
| End Similarity | NOT IDENTICAL |
| First End Distance From End to Groove | 0.156 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN |
| First End Groove Diameter | 1.4640 INCHES MINIMUM AND 1.4710 INCHES MAXIMUM IN |
| Second End Style | INDENTED FLAT KEYWAY |
| Material | STEEL |
| First End Groove Width | 0.1250 INCHES NOMINAL IN |
| External Keyway Length | 1.500 INCHES MINIMUM AND 1.510 INCHES MAXIMUM SECOND END IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 709-4684876 ITEM 13 | 5/2 Secondary reference U.S. Government activity |
| 709-4684876 ITE | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 87832-1605 | D/9 Drawing number reference only U.S. Government activity |
| 87832-1605 ITEM 13 | 3/2 Design control — primary reference U.S. Government activity |
| 709-4684876 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-121-9535 is a Shaft,shouldered, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 2520-01-123-8898, 2520-01-125-0061, 3040-01-133-4067. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-121-9535: Surface Finish: 125.0 MICROINCHES; Step Quantity: 6; First End Diameter: 1.5747 INCHES MINIMUM AND 1.5752 INCHES MAXIMUM IN; Second End Diameter: 1.4960 INCHES MINIMUM AND 1.4980 INCHES MAXIMUM IN. 17 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.
NSN 3040-01-121-9535 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.