Mechanical Components · Free generator

Stepped shaft coupling prototype

A stepped rigid coupling with two independent shaft sockets, radial locking pilots, recessed fastener seats and a central stop web.

Free customization & STL download · No account needed

AI CAD prompt ↓Edit & export STEP CAD ↓

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Edit the design. Export CAD.

Choose Continue editing in Nora3D inside the generator to keep your dimensions in an editable copy. Change features and export STEP CAD files.

Before you print

Outside diameter 32, length 50. Lower and upper blind sockets are each 22 deep, leaving a 6 mm central stop. Two locking pilots are perpendicular to the shaft; use suitable metal hardware. No torque, speed or balance rating. Geometry has been digitally checked; this template has not been physically test-printed.

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AI CAD prompt

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Use this prompt with Nora3D or your AI assistant. Review the resulting geometry before printing.

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Create a new owned Nora3D part document. Use millimeters, world XY as the base and +Z as height. Retain named native features and expose only the controls listed below.

1. Create **Main body**, radius 16, height 50, initially along +Z, with its base center at (0, 0, 0).
2. Create **Lower collar**, radius 19, height 7, initially along +Z, with its base center at (0, 0, 0).
3. Create **Upper collar**, radius 19, height 7, initially along +Z, with its base center at (0, 0, 43).
4. Unite **Main body**, **Lower collar**, **Upper collar** as **Coupling blank**. Require one connected result.
5. Create **Lower shaft**, radius 4, height 22, initially along +Z, with its base center at (0, 0, 0).
6. Create **Upper shaft**, radius 5, height 24, initially along +Z, with its base center at (0, 0, 28).
7. Create **Lower lock**, radius 1.6, height 23, initially along +Z, with its base center at (0, 0, 12).
8. Rotate the current **Lower lock** solid 90 degrees around world Y through [0, 0, 12]. Resolve the actual current entity ID before the operation.
9. Create **Upper lock**, radius 1.6, height 23, initially along +Z, with its base center at (0, 0, 38).
10. Rotate the current **Upper lock** solid 90 degrees around world Y through [0, 0, 38]. Resolve the actual current entity ID before the operation.
11. Create **Screw head relief 12**, a 5 × 8 × 8 box, centered at X=16, Y=0, with its bottom at Z=8.
12. Create **Screw head relief 38**, a 5 × 8 × 8 box, centered at X=16, Y=0, with its bottom at Z=34.
13. Create **Top washer**, radius 7, height 3, initially along +Z, with its base center at (0, 0, 47).
14. Subtract **Lower shaft**, **Upper shaft**, **Lower lock**, **Upper lock**, **Screw head relief 12**, **Screw head relief 38**, **Top washer** from **Coupling blank**, consuming the tools; name the result **Stepped coupling**.

## Public controls

| Control | Default | Range | Step | Meaning |
| --- | ---: | --- | ---: | --- |
| Lower shaft socket radius | 4 | 3–5 | 0.1 | Radius of the lower 22 mm deep shaft socket. |
| Upper shaft socket radius | 5 | 4–5.5 | 0.1 | Radius of the upper socket below the 3 mm washer recess. |
| Top washer recess radius | 7 | 6–8 | 0.1 | Washer recess above the fixed 10 mm upper shaft socket. |

All unlisted dimensions, topology and feature order remain fixed. Radius controls are radii, not diameters. These are independent numeric ranges; do not introduce unsupported formula bindings or assume a fit standard from an example value.

Adjustable dimensions

Parameter	Default	Range	Step
Lower shaft socket radius	4 mm	3–5 mm	0.1 mm
Upper shaft socket radius	5 mm	4–5.5 mm	0.1 mm
Top washer recess radius	7 mm	6–8 mm	0.1 mm