Brackets and mounts
Stepped Shaft with M20 Thread and M12 Mounting Hole
- Bounding box
- 25.0 × 25.0 × 80.0 mm
- Engine
- Precision B-rep
- Parameters
- 11
- Published
- November 2, 2026
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The prompt
Design a stepped mechanical shaft for CNC turning. Material: Stainless Steel 304. Total Length: 80mm. The shaft consists of three coaxial cylindrical segments from top to bottom: Segment 1 (Top section for platform attachment): 20mm diameter, 15mm length. The top 10mm length is threaded with M20x1.5 standard thread. Segment 2 (Middle section for bearing seats): 20mm diameter, 45mm length. Surface finish must be smooth for press-fitting two 6204 bearings (20mm inner diameter). Segment 3 (Bottom section for base mount): 25mm diameter (acting as a shoulder step), 20mm length. The bottom end features a concentric M12 threaded hole with 15mm depth for base locking. Provide 0.5mm fillets at the diameter transitions to reduce stress concentration. Output as a STEP file.
Parameters
| Name | Value | Range |
|---|---|---|
| Segment 1 Length | 15 mm | 5 – 50 |
| Segment 2 Length | 45 mm | 10 – 100 |
| Segment 3 Length | 20 mm | 5 – 50 |
| Segment 1 Diameter | 20 mm | 5 – 50 |
| Segment 2 Diameter | 20 mm | 5 – 50 |
| Segment 3 Diameter | 25 mm | 5 – 60 |
| Fillet Radius | 0.5 mm | 0 – 5 |
| External Thread Length (top) | 10 mm | 0 – 50 |
| Thread Pitch (M20) | 1.5 mm | 0.2 – 5 |
| Mounting Hole Diameter | 10.2 mm | 3 – 20 |
| Mounting Hole Depth | 15 mm | 1 – 30 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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