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  Timing Belt
Chains & Spockets


AMERICAN STANDARD TIMING BELTS

 

 

 

 

Pulley, Generating Tool
Rack Form Dimensions
for Involute Teeth
Belt Section Number of Grooves Pb +0.0001 β 10.25 (deg.) hr +0.0002 -0.000 bs +0.0002 -0.000 r1 +0.0001 r2 +0.0001 2a
MXL

XL
L
H

XI-I
XXH		 10 thru 23
24 & over
10 & over
10 & over
14 thru 19
over 19
18 & over
18 & over		 0.0800
0.0800
0.2000
0.3750
0.5000
0.5000
0.8750
1.2500		 56
40
50
40
40
40
40
40		 0.025
0.125
0.056
0.084
0.102
0.102
0.271
0.405		 0.024
0.0265
0.050
0.122
0.167
0.167
0.299
0.457		 0.012
0.012
0.024
0.034
0.058
0.052
0.079
0.106		 0.009
0.009
0.024
0.021
0.041
0.056
0.076
0.111		 0.020
0.020
0.020
0.030
0.054
0.054
0.110
0.120
  
 


FULL RADIUS TIMING BELT

 

 

 

 

Rack Form Dimensions**
Belt Section # of Grooves Pb hr bg bt r1 r2 r3 r4 X 2A
8 M 22-27
28-89
90-200		 0.31496
0.31496
0.31496		 0.1295
0.1422
0.1430		 0.1370
0.1640
0.1671		 0.2380
0.2381
0.2242		 0.1005
0.1092
0.1038		 0.045
0.042
0.037		 *
0.508
*		 0.0000
0.0286
0.0000		 0.0000
0.0098
0.0000		 0.054
0.054
0.054
14 M 28-36
37-89
90-216		 0.55118
0.55118
0.55118		 0.2489
0.2440
0.2500		 0.2799
0.3043
0.3192		 0.4385
0.4248
0.4040		 0.1857
0.1836
0.1820		 0.074
0.072
0.075		 0.820
0.620
0.792		 0.0450
0.0450
0.0100		 0.0000
0.0000
0.0000		 0.110
0.110
0.110
* Blend
** Chart Courtesy- Gates Rubber Co.

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