12B-2 duplex plate sprockets

12B-2 plate sprockets are duplex plate wheels for 12B-2 chain of 3/4" (19.05 mm) pitch to DIN 8187 / ISO 606, with two tooth rims spaced to match the chain strands.

12B-2 duplex plate wheels - higher forces without larger sprocket diameters

A duplex drive transmits higher forces without increasing sprocket diameters. Small plate wheels, which usually work as driving sprockets, are also available with induction-hardened teeth - this is exactly where hardening pays off most, because the teeth of a small sprocket wear fastest.

12B-2 plate sprockets in C45 steel, small plate wheels also with hardened teeth

12B-2 duplex plate wheels in C45 steel, with unhardened teeth, and small plate wheels with hardened teeth. 12B simplex and triplex plate wheels can be found in the neighbouring subgroups.

Tooth hardening and welding a 12B-2 plate wheel - questions and answers

Does tooth hardening affect welding the plate wheel?

No, provided you weld near the bore and do not overheat the tooth rim. The centre of the plate is soft and welds like ordinary C45 steel.