The Shaft,shouldered, cataloged under National Stock Number 3040-01-312-7709, 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11 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-312-7709 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Step Quantity | 4 |
| First End Diameter | 0.9350 INCHES MINIMUM AND 0.9360 INCHES MAXIMUM IN |
| Second End Diameter | 0.7470 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN |
| First End Style | PLAIN |
| Second End Keyway Width | 0.1880 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-M-291,CL A FED SPEC SINGLE MATERIAL RESPONSE |
| Second End Keyway Depth | 0.105 INCHES MINIMUM AND 0.119 INCHES MAXIMUM IN |
| End Similarity | NOT IDENTICAL |
| Second End Style | INDENTED FLAT KEYWAY |
| Material | STEEL |
| External Keyway Length | 1.000 INCHES MINIMUM AND 1.010 INCHES MAXIMUM 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 |
|---|---|
| 6129491 | D/9 Drawing number reference only Naval Sea Systems Command |
| 87832-1608A ITEM 8 | 3/2 Design control — primary reference U.S. Government activity |
| 87832-1608A | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-312-7709 is a Shaft,shouldered, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-313-0594, 1095-01-313-4636. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-312-7709: Step Quantity: 4; First End Diameter: 0.9350 INCHES MINIMUM AND 0.9360 INCHES MAXIMUM IN; Second End Diameter: 0.7470 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN; First End Style: PLAIN. 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.