halfs are types of sprockets that require additional machining before installation. They take the term finished bore because they are mainly associated with both B and C style sprockets. In these sprockets, the inside diameter of the system hub is machined so that it can accommodate varying types of shaft diameter. The design also includes a standard keyway and several set screws
for additional clamping force. The common designs of finished bore halfs have two set screws. In some cases, the finished bore halfs can be machined to non-standard but specific requirements based on specific needs of the applications. To pick the right finished bore for your system, it is important to be very specific about your chain
coupling and the size of the bore. Visit our page to see the full list of finished bore halfs including the 4016 PITCH: #40 Bore: Minimum Plain Bore, and 6018 1 1/4 PITCH: #60 Bore: 1 1/4 INCH among others.