Sprockets can be classified into standard sprockets, HK sprockets as well as other sprockets.
one. Common sprocket
Regular sprockets are ANSI sprockets which can be engaged with conventional series roller chains. See P125 for dimensions.
There are actually two varieties of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets may be engaged with HK series roller chains, and people for single strand chains are identical to typical sprockets. On the other hand, sprockets for many strand chains are distinctive from common sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are built according on the following calculation formulas to suit respective specialty chains.
The sprockets applied for the following chains will be the similar since the regular sprockets in tooth gap kind, but distinct in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of conventional sprockets together with other general sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated through the following calculation formulas.
Next, sprocket tooth profile (the shape of your tooth based upon its thickness) is calculated from your following calculation formulas. (The values proven in the following pages were calculated by these formulas and thought to be 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 basic dimensions of the sprocket ideal for a chain pitch of one mm are respectively termed pitch diameter issue, tip diameter factor and caliper diameter factor. The respective aspects for respective 
numbers of teeth are listed below. If these aspects are multiplied by chain pitch, the fundamental dimensions in the corresponding sprocket might be obtained.
Illustration:
During the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap forms
Since the most rational tooth gap forms during which the pressure angle modifications in response on the elongation of the smoothly rotated roller chain with all the lapse of service time, ANSI specify two types of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our standard sprockets also have S-tooth profiles.
