The Shaft,shouldered, cataloged under National Stock Number 3040-00-101-1687, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-00-101-1687 |
| Primary Part Number | 4K0731 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Step Quantity | 3 |
| First End Diameter | 1.1250 INCHES NOMINAL IN |
| Largest Step Diameter | 1.518 INCHES NOMINAL IN |
| First End External Thread Length | 1.125 INCHES NOMINAL IN |
| First End Style | EXTERNAL THREADED |
| End Similarity | IDENTICAL |
| Material | STEEL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 4K0731 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 4K731 | 5/9 Secondary reference Caterpillar Inc Div Caterpillar Defense |
NSN 3040-00-101-1687 is a Shaft,shouldered, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-101-1687 has 1 manufacturer part number on file: 4K0731 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 4K0731: Step Quantity: 3; First End Diameter: 1.1250 INCHES NOMINAL IN; Largest Step Diameter: 1.518 INCHES NOMINAL IN; First End External Thread Length: 1.125 INCHES NOMINAL IN. 7 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.