No. 120
PLAIN BORE SPROCKET DIMENSIONS
All dimensions in inches unless noted.
No. 120 Plain Bore Sprocket Dia.
Type “A” Plain Bore
Type “B” & “C” Plain Bore
No. Teeth
Outside Dia.
Pitch Dia.
Caliper Dia.
Plain Bore
Wt. Lbs.
Plain Bore
MAX Bore *
Hub Dia.
Hub Type
Hub Style
Wt. Lbs.
LTB
9
5.020
4.386
3.444
1.250
3.00
1.375
1.813 3.375 ¨
2.250
B
S
5.30
10
5.520
4.854
3.979
1.250
3.80
1.375
2.250 3.750 ¨
2.250
B
S
7.10
11
6.010
5.325
4.395
1.250
4.80
1.375
2.375
3.563
2.125
B
S
7.60
12
6.500
5.796
4.921
1.250
5.80
1.375
2.750
4.125
2.125
B
S
9.90
13
6.990
6.269
5.347
1.250
6.70
1.375
3.000
4.563
2.250
B
S
12.40
14
7.470
6.741
5.866
1.250
8.00
1.375
3.250
4.750
2.250
B
D
14.40
15
7.960
7.215
6.300
1.250
9.10
1.250
3.250
4.750
2.375
B
D
16.70
16
8.440
7.689
6.814
1.250
10.60
1.250
3.500
5.250
2.375
B
D
19.90
17
8.920
8.163
7.254
1.250
12.60
1.250
3.500
5.250
2.375
B
D
20.80
18
9.410
8.639
7.764
1.250
13.60
1.250
3.500
5.250
2.375
B
D
22.20
19
9.890
9.114
8.207
1.250
15.10
1.250
3.500
5.250
2.375
B
D
24.80
20
10.370
9.588
8.713
1.250
16.90
1.250
3.500
5.250
2.375
B
D
25.80
21
10.850
10.065
9.161
1.250
18.70
1.250
3.500
5.250
2.375
B
D
26.70
22
11.330
10.541
9.666
1.250
20.00
1.250
3.500
5.250
2.375
B
D
28.20
23
11.810
11.016
10.115
1.250
22.10
1.250
3.500
5.250
2.375
B
D
30.30
24
12.290
11.492
10.617
1.250
24.80
1.250
3.500
5.250
2.375
B
D
32.10
25
12.770
11.969
11.070
1.250
26.80
1.250
3.500
5.250
2.375
B
D
34.60
26
13.250
12.444
11.569
1.500
28.30
1.500
4.000
6.000
2.500
B
D
40.00
27
13.730
12.921
12.024
1.500
30.90
1.500
4.000
6.000
2.500
B
D
43.15
28
14.210
13.397
12.522
1.500
33.60
1.500
4.000
6.000
2.500
B
D
44.90
30
15.170
14.351
13.476
1.500
39.00
1.500
4.000
6.000
2.500
B
D
50.20
32
16.130
15.303
14.428
1.500
43.90
1.500
4.000
6.000
2.500
B
D
56.00
35
17.570
16.734
15.842
1.500
52.00
1.500
4.000
6.000
2.500
B
D
62.40
36
18.050
17.211
16.336
1.500
56.00
1.500
4.000
6.000
2.500
B
D
66.40
40
19.960
19.119
18.244
1.500
71.00
1.500
4.000
6.000
3.750
C
D
92.00
42
20.920
20.073
19.198
1.500
75.00
1.500
4.000
6.000
3.750
C
D
98.00
45
22.350
21.504
20.615
1.500
88.00
1.500
4.000
6.000
3.750
C
D
99.20
48
23.790
22.935
22.060
1.500
103.00
1.500
4.000
6.000
4.000
C
D 113.00
54
26.650
25.797
24.922
1.500
140.00
1.500
4.000
6.000
4.000
C
D 133.00
60
29.520
28.661
27.786
1.500
160.00
1.500
5.250
7.000
4.000
C
D 160.00
70
34.300
33.434
32.559
1.500
216.00
1.500
5.375
7.500
4.500
C
D 206.00
80
39.080
38.207
37.332
1.500
284.00
1.500
5.375
7.500
4.500
C
D 254.00
* Dimensions shown allow for standard keyway with set screw at 90 degrees ¨ Has recessed groove in hub for chain clearance
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