Machinery's Handbook, 31st Edition
Transmission Roller Chains 2631 Table 10. Recommended Roller Chain Sprocket Maximum Bore and Hub Diameters Roller Chain Pitch
1
1 ∕ 2
5 ∕ 8
3 ∕ 4
3 ∕ 8
No. of Teeth
Max. Hub Dia.
Max. Hub Dia. 1 11 ∕ 64 1 21 ∕ 64 1 21 ∕ 32 1 13 ∕ 16 1 63 ∕ 64 2 9 ∕ 64 1 1 ∕ 2 2 19 ∕ 64 2 29 ∕ 64 2 25 ∕ 32 2 15 ∕ 16 3 3 ∕ 32 3 17 ∕ 64 2 5 ∕ 8 3 27 ∕ 64
Max. Hub Dia. 1 15 ∕ 32 1 43 ∕ 64 2 5 ∕ 64 2 9 ∕ 32 2 31 ∕ 64 2 11 ∕ 16 1 7 ∕ 8 2 57 ∕ 64 3 5 ∕ 64 3 9 ∕ 32 3 31 ∕ 64 3 11 ∕ 16 3 57 ∕ 64 4 5 ∕ 64 4 9 ∕ 32
Max. Hub Dia. 1 49 ∕ 64 2 1 ∕ 64
Max. Hub Dia. 2 45 ∕ 64 3 1 ∕ 64 3 11 ∕ 32 3 43 ∕ 64 2 3 ∕ 8 3 63 ∕ 64 4 5 ∕ 16 4 41 ∕ 64 4 61 ∕ 64 5 9 ∕ 32 5 19 ∕ 32 5 59 ∕ 64 6 15 ∕ 64
Max. Bore
Max. Bore
Max. Bore 31 ∕ 32 1 5 ∕ 32 1 9 ∕ 32 1 5 ∕ 16 1 17 ∕ 32 1 11 ∕ 16 1 25 ∕ 32 1 7 ∕ 8 2 1 ∕ 16 2 1 ∕ 4 2 9 ∕ 32 2 7 ∕ 16 2 5 ∕ 8 2 13 ∕ 16 2 27 ∕ 32 Max. Bore 2 13 ∕ 16 3 1 ∕ 4 3 9 ∕ 16 3 7 ∕ 8 4 7 ∕ 16 4 11 ∕ 16 5 1 ∕ 16
Max. Bore
Max. Bore
11 12 13 14 15 16
1 1 ∕ 4 1 9 ∕ 32 1 1 ∕ 2 1 3 ∕ 4 1 25 ∕ 32 1 31 ∕ 32 2 7 ∕ 32 2 9 ∕ 32 2 7 ∕ 16 2 11 ∕ 16 2 13 ∕ 16 2 15 ∕ 16
1 5 ∕ 8
55 ∕ 64 63 ∕ 64
25 ∕ 32
19 ∕ 32
1 25 ∕ 32
7 ∕ 8
5 ∕ 8 3 ∕ 4
1
2
1 7 ∕ 64 1 15 ∕ 64 1 23 ∕ 64 1 15 ∕ 32 1 19 ∕ 32 1 23 ∕ 32 1 27 ∕ 32 1 61 ∕ 64 2 5 ∕ 64 2 13 ∕ 16 2 5 ∕ 16 2 7 ∕ 16 2 9 ∕ 16 Max. Hub Dia. 2 31 ∕ 32 3 25 ∕ 32 4 3 ∕ 16 4 19 ∕ 32 3 3 ∕ 8 5 13 ∕ 32 5 51 ∕ 64 6 13 ∕ 64 6 39 ∕ 64 7 13 ∕ 32 7 13 ∕ 16 8 13 ∕ 64 8 39 ∕ 64 5 7
2 1 ∕ 4 2 1 ∕ 2 2 3 ∕ 4
1 5 ∕ 32 1 1 ∕ 4 1 9 ∕ 32 1 3 ∕ 8 1 17 ∕ 32 1 11 ∕ 16 1 25 ∕ 32 1 25 ∕ 32 1 15 ∕ 16 2 3 ∕ 32 2 1 ∕ 4 2 9 ∕ 32
2 9 ∕ 32 2 13 ∕ 32 2 23 ∕ 32 2 13 ∕ 16 3 1 ∕ 8 3 5 ∕ 16 3 1 ∕ 2 3 3 ∕ 4 3 7 ∕ 8 4 3 ∕ 16 4 9 ∕ 16 4 11 ∕ 16
27 ∕ 32
7 ∕ 8
2 63 ∕ 64 3 7 ∕ 32 3 15 ∕ 32 3 45 ∕ 64 3 61 ∕ 64 4 3 ∕ 16 4 7 ∕ 16 4 43 ∕ 64 4 29 ∕ 32 5 5 ∕ 32
31 ∕ 32
17 1 3 ∕ 32 18 1 7 ∕ 32 19 1 1 ∕ 4 20 1 9 ∕ 32 21 1 5 ∕ 16 22 1 7 ∕ 16 23 1 9 ∕ 16 24 1 11 ∕ 16 25 1 3 ∕ 4 11 1 31 ∕ 32 12 2 9 ∕ 32 13 2 17 ∕ 32 14 2 11 ∕ 16 15 3 3 ∕ 32 16 3 9 ∕ 32 17 3 21 ∕ 32 18 3 25 ∕ 32 Max. Bore 19 4 3 ∕ 16 20 4 19 ∕ 32 21 4 11 ∕ 16 22 4 7 ∕ 8 23 5 5 ∕ 16 24 5 11 ∕ 16 25 5 23 ∕ 32
3 1 ∕ 8 3 1 ∕ 4 3 3 ∕ 8
6 9 ∕ 16 6 7 ∕ 8
Roller Chain Pitch
1 1 ∕ 4
1 1 ∕ 2
1 3 ∕ 4
2
2 1 ∕ 2
Max. Hub Dia.
Max. Hub Dia.
Max. Hub Dia. 4 25 ∕ 32 5 27 ∕ 64 6 5 ∕ 64 6 23 ∕ 32 8 1 ∕ 64 8 21 ∕ 32 9 5 ∕ 16 9 61 ∕ 64 7 3 ∕ 8 10 19 ∕ 32 11 15 ∕ 64 12 33 ∕ 64 13 5 ∕ 32 13 51 ∕ 64 11 7 ∕ 8
Max. Hub Dia.
No. of Teeth
Max. Bore 2 5 ∕ 16
Max. Bore
Max. Bore
3 37 ∕ 64 4 1 ∕ 16 4 35 ∕ 64 5 1 ∕ 32 5 33 ∕ 64 6 31 ∕ 64 6 31 ∕ 32 7 29 ∕ 64 7 15 ∕ 16 6 8 27 ∕ 64 8 57 ∕ 64
4 11 ∕ 64 4 3 ∕ 4 5 5 ∕ 16 5 7 ∕ 8 6 29 ∕ 64 7 1 ∕ 64 7 37 ∕ 64 8 9 ∕ 64 8 45 ∕ 64 9 17 ∕ 64 9 53 ∕ 64
3 9 ∕ 32 3 5 ∕ 8 4 1 ∕ 16 4 11 ∕ 16 4 7 ∕ 8 5 1 ∕ 2 6 1 ∕ 4 6 7 ∕ 8 5 11 ∕ 16
3 15 ∕ 16 4 23 ∕ 32 5 3 ∕ 32 5 23 ∕ 32
5 63 ∕ 64 6 51 ∕ 64 7 39 ∕ 64 8 27 ∕ 64 9 7 ∕ 32
2 3 ∕ 4 3 1 ∕ 16 3 5 ∕ 16 3 3 ∕ 4
6 1 ∕ 4
4
7
10 1 ∕ 32 10 27 ∕ 32 11 41 ∕ 64 12 7 ∕ 16 13 1 ∕ 4 14 3 ∕ 64 14 27 ∕ 32 15 21 ∕ 32 16 29 ∕ 64
4 15 ∕ 32 4 21 ∕ 32 4 15 ∕ 16 5 7 ∕ 16 5 11 ∕ 16
7 7 ∕ 16 8 1 ∕ 8
5 5 ∕ 8
9
5 11 ∕ 16
7
6 1 ∕ 4
9 3 ∕ 4
10
6 13 ∕ 16 7 1 ∕ 4 7 7 ∕ 16
7 3 ∕ 4 8 3 ∕ 8
5 7 ∕ 8 6 3 ∕ 8
10 25 ∕ 64 10 15 ∕ 16 11 1 ∕ 2 12 1 ∕ 16
10 7 ∕ 8 11 5 ∕ 8
9
9 3 ∕ 8
8
13
6 13 ∕ 16
9 55 ∕ 64 10 11 ∕ 32
9 5 ∕ 8
7 1 ∕ 4
8 9 ∕ 16
10 1 ∕ 4
13 1 ∕ 2
17 1 ∕ 4
All dimensions in inches. For standard key dimensions see pages 2539 through 2552. Source: American Chain Association. Center Distance between Sprockets.— The center-to-center distance between sprock ets, as a general rule, should not be less than 1 1 ⁄ 2 times the diameter of the larger sprocket and not less than 30 times the pitch nor more than about 50 times the pitch, although much depends upon the speed and other conditions. A center distance equivalent to 80 pitches may be considered an approved maximum. Very long center distances result in catenary tension in the chain. If roller-chain drives are designed correctly, the center- to-center distance for some transmissions may be so short that the sprocket teeth nearly touch each other, assuming that the load is not too great and the number of teeth is not too
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