Xem Studiomeasured geometryFlexible shaft couplers, 5–10 mm bores
What size is a 5 mm to 8 mm flexible coupler? · Hardware · basis: Common aluminium helical (beam) couplers as sold for 3D printers and CNC kits
- sizes
- 6 in table
Notes
- Ø19 × 25 mm for 5 → 5 and 5 → 8; Ø25 × 30 mm for 6.35/8/10 mm bores. Two set screws per end at 90°.
- Helical couplers take 0.2 mm misalignment; for a lead screw also add a bearing block at the far end or let the end float.
- Spiral cut is shown as three slots in these files; the envelope is what matters for the print.
Sizes
| bore_1_mm | bore_2_mm | od_mm | length_mm | set_screws |
|---|---|---|---|---|
| 5 | 5 | 19 | 25 | M4 × 2 per end |
| 5 | 8 | 19 | 25 | M4 × 2 per end |
| 5 | 8 | 25 | 30 | M4 × 2 per end |
| 6.35 | 8 | 25 | 30 | M4 × 2 per end |
| 8 | 8 | 25 | 30 | M4 × 2 per end |
| 8 | 10 | 25 | 30 | M4 × 2 per end |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| McMaster-Carr | Shaft couplings (free STEP/IGES/STL per part, for your own design use; no redistribution) | STEP, IGES, STL, PDF | McMaster-Carr site terms: personal design use, no redistribution verify |
| Wikipedia | Coupling | web | CC BY-SA 4.0 (text) |
Free files
★ Free files 6 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| coupler-5x5-d19 | flexible coupler 5 → 5 mm, Ø19 × 25; spiral shown as slots | STEP · STL |
| coupler-5x8-d19 | flexible coupler 5 → 8 mm, Ø19 × 25; spiral shown as slots | STEP · STL |
| coupler-5x8-d25 | flexible coupler 5 → 8 mm, Ø25 × 30; spiral shown as slots | STEP · STL |
| coupler-6.35x8-d25 | flexible coupler 6.35 → 8 mm, Ø25 × 30; spiral shown as slots | STEP · STL |
| coupler-8x8-d25 | flexible coupler 8 → 8 mm, Ø25 × 30; spiral shown as slots | STEP · STL |
| coupler-8x10-d25 | flexible coupler 8 → 10 mm, Ø25 × 30; spiral shown as slots | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=shaft-couplers
Fits with
Questions
What coupler connects a NEMA 17 to a T8 lead screw?
A 5 mm → 8 mm flexible coupler, Ø19 × 25 mm (or Ø25 × 30 for more torque).
What is the OD of a 5x8 flexible coupler?
19 mm on the small (25 mm long) version, 25 mm on the 30 mm long version.