MM keyless locking bushes

MM keyless locking bushes are a frictional shaft-hub connection with a thick wall. The large difference between the shaft diameter and the hub bore allows a relatively thin shaft to be fitted in a large bore.

MM keyless locking bushes - a smaller shaft in a large pulley bore

The MM type saves the day in retrofits: when an existing pulley has a large bore and the new shaft has a smaller diameter, you do not have to sleeve the hub or order a new pulley. It also works well in pulleys with a massive hub. The connection requires no key, allows precise positioning of the pulley and transmits torque without play.

Thick-walled MM locking bushes for small and medium shafts

MM bushes designated by the d/D dimensions, for small and medium shafts. Bushes from the PP group have an even thicker wall. Exact dimensions are given on the product page.

When to use an MM locking bush - frequently asked questions

When should I choose the MM type?

When the hub has a large bore relative to the shaft, for example a 20 mm shaft in a 50 mm bore - then an MM 20/50 bush fits.