Modified Stock Gearing - Boston Gear

Ladder Chain Sprockets
Type B Single Hub
Nos. 1A and 1; Bronze and Steel (All Sprockets Equipped with Standard Setscrews, Except CBA 8)
Teeth
No. 1A
ORDER BY CATALOG NUMBER OR ITEM CODE
Pitch
Bore
Hub
Style
Catalog Item
Diam.
Diameter Project
Number Code
BRONZE SPROCKETS
8 .48 1/8 5/16† 7/32 Plain CBA8 16856
10 .60 1/8 3/8 7/32 Plain CBA10 16858
12 .71 3/16 7/16 7/32 Plain CBA12 16860
15 .88 3/16 7/16 7/32 Plain CBA15B 16862
18 1.06 3/16 1/2 1/4 Plain CBA18B 16864
20 1.18 3/16 5/8 1/4 Plain CBA20B 16866
24 1.41 3/16 3/4 1/4 Plain CBA24B 16868
32 1.88 1/4 5/8 5/16 Plain CBA32 16870
36 2.12 5/16 3/4 3/8 Plain CBA36 16872
STEEL SPROCKETS
7 .42 3/16 3/8† 1/2 Plain CA7 14780
8 .48 3/16 7/16† 1/2 Plain CA8 14782
9 .54 1/4 1/2† 1/2 Plain CA9 14784
10 .60 1/4 9/16† 1/2 Plain CA10 14786
12 .71 1/4 11/16† 1/2 Plain CA12 14788
14 .83 1/4 3/4† 1/2 Plain CA14 14790
16 .95 5/16 7/8† 1/2 Plain CA16 14792
20 1.18 5/16 7/8 13/32 Plain CA20 14794
24 1.41 5/16 7/8 13/32 Plain CA24 14796
34 2.00 3/8 1-1/4 1/2 Plain CA34 14798
42 2.47 3/8 1-1/4 1/2 Plain CA42 14800
No. 1
BRONZE SPROCKETS
6 .57 3/16 11/32† 1/4 Plain CB1 6 16878
8 .75 3/16 1/2 1/4 Plain CB1 8 16880
10 .93 3/16 1/2 1/4 Plain CB1 10 16882
11 1.01 3/16 1/2 1/4 Plain CB1 11 16884
12 1.10 3/16 1/2 1/4 Plain CB1 12 16886
14 1.28 1/4 5/8 5/16 Plain CB1 14 16890
24 2.19 5/16 3/4 3/8 Plain CB1 24 16900
32 2.92 5/16 3/4 3/8 Plain CB1 32 16904
†Has Recessed Groove in Hub for Chain Clearance
.087 7/32
P.D.
.087
P.D.
5/32
3/32
H
STANDARD TOLERANCES
Dimension
Tolerance
Bore All ±.001
.120
7/32
P.D.
7/32
P-1930-BG 04/10 Boston Gear 800-825-6544 291