Sprockets might be classified into conventional sprockets, HK sprockets and various sprockets.
one. Typical sprocket
Regular sprockets are ANSI sprockets which may be engaged with typical series roller chains. See P125 for dimensions.
There are actually two kinds of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets can be engaged with HK series roller 
chains, and individuals for single strand chains are identical to regular sprockets. Even so, sprockets for multiple strand chains are diverse from typical sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are built in accordance to the following calculation formulas to suit respective specialty chains.
The sprockets applied for that following chains are the same as the common sprockets in tooth gap kind, but different in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of regular sprockets together with other basic sprockets are calculated as follows. At first, the diameters of sprockets are calculated from the following calculation formulas.
Upcoming, sprocket tooth profile (the form from the tooth according to its thickness) is calculated in the following calculation formulas. (The values proven from the following pages have been calculated by these formulas and thought to be the conventional values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of the sprocket suitable to get a chain pitch of one mm are respectively termed pitch diameter issue, tip diameter component and caliper diameter issue. The respective factors for respective numbers of teeth are listed under. If these elements are multiplied by chain pitch, the basic dimensions of your corresponding sprocket is often obtained.
Example:
During the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap varieties
Since the most rational tooth gap kinds during which the pressure angle modifications in response for the elongation of a smoothly rotated roller chain using the lapse of service time, ANSI specify two varieties of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our standard sprockets also have S-tooth profiles.
