Roller Chain Sprocket Diameters Dimesions per. ANSI/ASME B29.1M

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Roller Chain Sprocket Diameters Dimesions per. ANSI/ASME B29.1M

Mechanical Components
ANSI ASME Mechanical Hardware

ANSI Roller Chain Sprocket Diameters and Dimensions per. ANSI/ASME B29.1M

These diameters and caliper factors apply only to chain of 1-inch pitch.
For any other pitch, multiply the values given below by the pitch. Caliper Dia. (even teeth) = Pitch Diameter − Roller Dia. Caliper Dia. (odd teeth) = Caliper factor × Pitch − Roller Dia.

No. Teeth

Pitch Diameter

Outside Diameter

Turned

Topping
Hob Cut

Caliper Factor

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108

2.9238
3.2361
3.5495
3.8637
4.1786
4.4940
4.8097
5.1258
5.4422
5.7588
6.0755
6.3924
6.7095
7.0267
7.3439
7.6613
7.9787
8.2962
8.6138
8.9314
9.2491
9.5668
9.8845
10.2023
10.5201
10.8379
11.1558
11.4737
11.7916
12.1095
12.4275
12.7455
13.0635
13.3815
13.6995
14.0175
14.3355
14.6535
14.9717
15.2898
15.6079
15.9260
16.2441
16.5622
16.8803
17.1984
17.5165
17.8347
18.1528
18.4710
18.7892
19.1073
19.4255
19.7437
20.0618
20.3800
20.6982
21.0164
21.3346
21.6528
21.9710
22.2892
22.6074
22.9256
23.2438
23.5620
23.8802
24.1984
24.5166
24.8349
25.1531
25.4713
25.7896
26.1078
26.4260
26.7443
27.0625
27.3807
27.6990
28.0172
28.3354
28.6537
28.9719
29.2902
29.6084
29.9267
30.2449
30.5632
30.8815
31.1997
31.5180
31.8362
32.1545
32.4727
32.7910
33.1093
33.4275
33.7458
34.0641
34.3823

3.348
3.678
4.006
4.332
4.657
4.981
5.304
5.627
5.949
6.271
6.593
6.914
7.235
7.555
7.876
8.196
8.516
8.836
9.156
9.475
9.795
10.114
10.434
10.753
11.073
11.392
11.711
12.030
12.349
12.668
12.987
13.306
13.625
13.944
14.263
14.582
14.901
15.219
15.538
15.857
16.176
16.495
16.813
17.132
17.451
17.769
18.088
18.407
18.725
19.044
19.363
19.681
20.000
20.318
20.637
20.956
21.274
21.593
21.911
22.230
22.548
22.867
23.185
23.504
23.822
24.141
24.459
24.778
25.096
25.415
25.733
26.052
26.370
26.689
27.007
27.326
27.644
27.962
28.281
28.599
28.918
29.236
29.555
29.873
30.192
30.510
30.828
31.147
31.465
31.784
32.102
32.421
32.739
33.057
33.376
33.694
34.013
34.331
34.649
34.968

3.364
3.676
3.990
4.352
4.666
4.982
5.298
5.614
5.930
6.292
6.609
6.926
7.243
7.560
7.877
8.195
8.512
8.829
9.147
9.465
9.782
10.100
10.418
10.736
11.053
11.371
11.728
12.046
12.364
12.682
13.000
13.318
13.636
13.954
14.272
14.590
14.908
15.226
15.544
15.862
16.180
16.498
16.816
17.134
17.452
17.770
18.089
18.407
18.725
19.043
19.361
19.680
19.998
20.316
20.634
20.952
21.270
21.588
21.907
22.225
22.543
22.861
23.179
23.498
23.816
24.134
24.452
24.770
25.089
25.407
25.725
26.043
26.362
26.680
26.998
27.316
27.635
27.953
28.271
28.589
28.907
29.226
29.544
29.862
30.180
30.499
30.817
31.135
31.454
31.772
32.090
32.408
32.727
33.045
33.363
33.681
34.000
34.318
34.636
34.954

2.8794

3.5133

4.1481

4.7834

5.4190

6.0548

6.6907

7.3268

7.9630

8.5992

9.2355

9.8718

10.5082

11.1446

11.7810

12.4174

13.0539

13.6904

14.3269

14.9634

15.5999

16.2364

16.8729

17.5094

18.1459

18.7825

19.4190

20.0556

20.6921

21.3287

21.9653

22.6018

23.2384

23.8750

24.5116

25.1481

25.7847

26.4213

27.0579

27.6945

28.3310

28.9676

29.6042

30.2408

30.8774

31.5140

32.1506

32.7872

33.4238

34.0604