Size
Radio
A
A1
AB
B
BB
CC
E
F
M
N
40
5:1 10:1 15:1 20:1 30:1 40:1 50:1 60:1
2.24
3.35
1.57
2.91
1.575
2.76
3.15
3.54
3.94
50
4.13
2.08
3.82
1.969
3.74
4.33
4.72
5.51
60
3.09
2.20
2.362
5.12
5.91
70
3.76
2.52
2.756
4.53
7.48
80
4.11
6.30
2.85
3.150
5.31
7.09
6.69
8.66
100
4.78
7.00
2.95
6.10
3.937
10.24
120
8.26
9.06
4.02
7.28
4.724
12.60
135
6.89
8.27
5.135
7.87
11.42
9.84
13.78
155
7.64
11.89
5.20
9.92
6.102
11.02
15.35
175
8.78
12.80
5.71
10.31
6.890
12.20
16.93
200
9.61
12.01
7.874
14.17
18.90
250
16.00
16.54
9.843
14.96
18.11
22.05
H
HL
LL
G
Z
Input Shaft
Output Shaft
U
HS
T × V
S
LS
W × Y
0.47
0.39
0.500
1.10
1/8 × 1/16
0.625
1.38
3/16 × 3/32
1.97
0.59
0.43
1.18
0.750
2.36
0.70
1.000
1/4 × 1/8
9.57
0.79
0.875
1.125
10.75
1.375
2.56
5/16 × 5/32
13.39
0.98
1.500
3/8 × 3/16
16.14
9.45
0.71
1.750
18.50
10.63
1.625
2.250
1/2 × 1/4
19.49
2.500
5/8 × 5/16
21.89
13.19
1.46
1.875
2.750
24.61
14.76
1.65
0.87
2.000
2.875
4.92
3/4 × 3/8
29.72
17.72
1.89
1.06
3.500
7/8 × 7/16