20B-2 hardened hub sprockets

20B-2 hardened hub sprockets have two tooth rims for duplex 20B-2 chain of 1 1/4" (31.75 mm) pitch to DIN 8187 / ISO 606. The teeth on both rims are induction-hardened.

20B-2 hardened sprocket - resistant to abrasion and shocks

Hard teeth and a tough core are a combination that copes well with both abrasion and the shocks typical of heavy drives. Two chain strands transmit high power, and the C45 steel hub remains soft, so you can machine the bore for your shaft.

20B-2 duplex sprockets with 45-55 HRC hardened teeth

20B-2 duplex sprockets in C45 steel with teeth hardened to 45-55 HRC, in a choice of tooth counts typical of driving sprockets. 20B duplex sprockets with unhardened teeth can be found in the Hub sprockets group.

Questions and answers: 20B-2 hardened sprockets

How can I tell that the sprocket needs replacing?

By pointed teeth, worn flanks or hook-shaped teeth. A chain that climbs onto the teeth or jumps them is a signal for urgent replacement.