Timing Belt Pulley - Pitch Diameter and Outside Diameter Charts
The following timing belt pulley Pitch Diameter (P.D.) and timing belt pulley Outside Diameter (O.D.) charts allow the end user to quickly determine the dimensional requirements for a timing belt drive system. These charts allow the user to check for interferences before a system is designed for a given ratio. This is the second most common problem encountered when talking with an end user. Often the Outside Diameter (O.D.) of a particular timing belt pulley is not considered before a design is finalized.
Timing belt pulley Pitch Diameter (P.D.) has a direct relationship between the timing belt pulley and the timing belt. The reinforcing tensile cord of the timing belt forms the pitch line of the timing belt. Thus the Pitch Diameter (P.D.) of a timing belt pulley coincides with the pitch line of the timing belt meshing with it.
Pitch Diameter (P.D.) = (Pitch x Number of teeth) / Pi (3.14159)
Timing belt pulley Outside Diameter (O.D.) further builds upon the relationship between the timing belt pulley and timing belt. The Outside Diameter (O.D.) of the timing belt pulley is in contact with the tooth bottom of the timing belt while meshing with it. The distance from the timing belt tooth bottom to the tensile cord (pitch line) will determine the Outside Diameter (O.D.) of the timing belt pulley for any timing belt pitch/timing belt tooth profile.
Outside Diameter (O.D.) = Pitch Diameter (P.D.) – (2 x U)
Note: “U” = distance between the tensile cord and the bottom of the timing belt tooth
2mm Pitch - Timing Belt Pulley Pitch Diameter and Outside Diameter Charts
2mm PowerGrip GT- (2mm PowerGrip GT) Timing Belt Pulley PD and OD
- (2mm PowerGrip GT2) Timing Belt Pulley PD and OD
- (2mm PowerGrip GT3) Timing Belt Pulley PD and OD
3mm Pitch - Timing Belt Pulley Pitch Diameter and Outside Diameter Charts
3mm HTD 3mm PowerGrip GT- (3mm PowerGrip GT) Timing Belt Pulley PD and OD
- (3mm PowerGrip GT2) Timing Belt Pulley PD and OD
- (3mm PowerGrip GT3) Timing Belt Pulley PD and OD
5mm Pitch - Timing Belt Pulley Pitch Diameter and Outside Diameter Charts
5mm HTD 5mm PowerGrip GT- (5mm PowerGrip GT) Timing Belt Pulley PD and OD
- (5mm PowerGrip GT2) Timing Belt Pulley PD and OD
- (5mm PowerGrip GT3) Timing Belt Pulley PD and OD
8mm Pitch - Timing Belt Pulley Pitch Diameter and Outside Diameter Charts
8mm CTD 8mm HTD 8mm PowerGrip GT2 8mm PolyChain GT 8mm RPP 8mm STD 8mm YU- N/A
9.525mm Pitch - Timing Belt Pulley Pitch Diameter and Outside Diameter Charts
9.525mm HTD2 (RU)- N/A
11mm Pitch - Timing Belt Pulley Pitch Diameter and Outside Diameter Charts
11mm HTD- N/A
- N/A