Steel.
Toothed pulleys without aluminium rim flanges.

Steel phosphated.
Aluminium bright.

Standard HTD profile with metric graduation (semicircular toothing). At least one toothed belt pulley must have a rim flange. The toothed belt pulleys have a centre bore or are pre-drilled (this can vary due to production methods). For this reason, the dimension D2 max. given in the table is the maximum diameter of the bore that the toothed belt pulleys are supplied with. This pilot hole/centre bore can be customised with a reamed hole, reamed hole with keyway or a tapped hole by the customer. Alternatively, bushes can be fitted by the customer to reduce the diameter.
To reduce weight, the toothed belt pulleys may have a recess on one face.