Sprockets is usually classified into normal sprockets, HK sprockets and other sprockets.
1. Normal sprocket
Common sprockets are ANSI sprockets which may be engaged with conventional series roller chains. See P125 for dimensions.
You’ll find two styles of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets might be engaged with HK series roller chains, and these for single strand chains are identical to typical sprockets. Even so, sprockets for several strand chains are unique from conventional sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made according to the following calculation formulas to suit respective specialty chains.
The sprockets utilised for that following chains are the identical as the normal sprockets in tooth gap form, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of common sprockets and also other common sprockets are calculated as follows. To start with, the diameters of sprockets are calculated from your following calculation formulas.
Next, sprocket tooth profile (the form of the tooth depending on its thickness) is calculated from the following calculation formulas. (The values shown inside the following pages had been calculated by these formulas and regarded as the standard values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental 
dimensions of a sprocket ideal for a chain pitch of one mm are respectively termed pitch diameter aspect, tip diameter aspect and caliper diameter factor. The respective variables for respective numbers of teeth are listed under. If these components are multiplied by chain pitch, the essential dimensions of your corresponding sprocket might be obtained.
Instance:
While in the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap kinds
Since the most rational tooth gap varieties during which the pressure angle adjustments in response towards the elongation of a smoothly rotated roller chain with all the lapse of support time, ANSI specify two types of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.
