BS (12B) Sprockets – 3/4

BS (12B) Sprockets – 3/4

Tooth radius: r3 = 19
Radius size: C = 2
Tooth width: B1 = 11.1
Tooth width: b1 = 10.8
Tooth width: B2 = 30.3
Tooth width: B3 = 49.8

No. teeth Outside
dia. de
Pitch
dia. dp
Simplex* Duplex* Triplex*
dm D1 A dm D1 A dm D1 A
8 57.6 49.78 31 12 30 31 12 45 31 16 65
9 62 55.70 37 12 30 37 12 45 37 16 65
10 69 61.64 42 12 30 42 12 45 42 16 65
11 75 67.61 46 14 35 47 16 50 47 20 70
12 81.5 73.60 52 14 35 53 16 50 53 20 70
13 87.5 79.59 58 14 35 59 16 50 59 20 70
14 93.6 85.61 64 14 35 65 16 50 65 20 70
15 99.8 91.63 70 14 35 71 16 50 71 20 70
16 105.5 97.65 75 16 35 77 20 50 77 20 70
17 111.5 103.67 80 16 35 83 20 50 83 20 70
18 118 109.71 80 16 35 89 20 50 89 20 70
19 124.2 115.75 80 16 35 95 20 50 95 20 70
20 129.7 121.78 80 16 35 100 20 50 100 20 70
21 136 127.82 90 20 40 100 20 50 100 20 70
22 141.8 133.86 90 20 40 100 20 50 100 20 70
23 149 139.90 90 20 40 110 20 50 110 20 70
24 153.9 145.94 90 20 40 110 20 50 110 20 70
No.

teeth

Outside

dia. de

Pitch

dia. dp

Simplex* Duplex* Triplex*
dm D1 A dm D1 A dm D1 A
25 160 152.00 90 20 40 120 20 50 120 20 70
26 165.9 158.04 95 20 40 120 20 50 120 20 70
27 172.3 164.09 95 20 40 120 20 50 120 20 70
28 178 170.13 95 20 40 120 20 50 120 20 70
29 184.1 176.19 95 20 40 120 20 50 120 20 70
30 190.5 182.25 95 20 40 120 20 50 120 20 70
31 196.3 188.31 100 20 40 130 20 50 130 25 70
32 203.3 194.35 100 20 40 130 20 50 130 25 70
33 209.3 200.40 100 20 40 130 20 50 130 25 70
34 214.6 206.46 100 20 40 130 20 50 130 25 70
35 221 212.52 100 20 40 130 20 50 130 25 70
36 226.8 218.58 100 20 40 130 25 50 130 25 70
37 232.9 224.64 100 20 40 130 25 50 130 25 70
38 239 230.69 100 20 40 130 25 50 130 25 70
39 245.1 236.75 100 20 40 130 25 50 130 25 70
40 251.3 242.81 100 20 40 130 25 50 130 25 70
57 355.4 345.81 118 25 61 136 25 62

* Bore Ø H12
All dimensions in mm. Intermediate sizes & special sprockets to drawing up to 1000mm diameter. Standard: to DIN 8187 ISO/R 606

Available from stock

Special order – typically 7-10 days

NB: Please refer to page 585 for tooth sizes above 57 teeth.