Steel.
Toothed pulleys without aluminum rim flanges.

Steel phosphated.
Aluminum bright.

Standard HTD profile with metric pitch (half-round toothing). At least one belt pulley must have a rim flange. The toothed belt pulleys have a center bore or a pilot hole (this can vary due to manufacturing methods). For this reason, the dimension D2 max. given in the table is the maximum diameter of the bore with which the toothed belt pulleys are supplied. This pilot/center bore can be amended by the customer to produce a reamed bore, reamed bore with keyway or a tapped hole. Alternatively, customers can also use bushings to reduce the bore diameter.
The pulleys may be recessed on the sides.