Plain 686ZZ upper bearing stack
The two bearings are plain 686ZZ: 6 mm bore, 13 mm OD, 5 mm wide. The upper stack uses the printed RR308 datum shim and cap. The lower bearing sits in its seat under the keeper.
| Order | Part | Specification |
|---|---|---|
| 1 | Upper datum shim | 13 mm OD × 11.7 mm ID × 1 mm thick; set flat at the bottom of the upper pedestal seat. |
| 2 | Plain 686ZZ bearing | 6 × 13 × 5 mm. |
| 3 | RR308 cap | Retains the bearing outer race; M18 × 1.5 external thread; roof opening 11.7 mm. |
Use the animation
The viewer shows the RR308 cap and shim meshes, with the shim step placed before the bearing step. The cap threads on in the animation.
The shim and cap print files are on Printables.
See hardware quantities by assembly step and as-built notes.