The Studica Robotics Flange Bearing 14mm OD fits any channel or flat bracket with the common hole pattern having a center hole of 14mm. The inside diameter will fit any of the D-Shaft axles.
The Studica Robotics Small Thrust Ball Bearing is used for vertical and axial loads to withstand heavy loads. These ball bearings have track grooves on the upper and lower track boards to reduce friction. Use these with structure for any hole where an axial load will be applied.