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SPROCKETS
pitch (click for dimensions)	quoting	Drawings
[25-B] [35-A] [35-B] [40-A] [40-B] [41-A] [41-B]	CMT^® part numbers custom products	no hub - type A hub - type B

All Steel Sprockets
For A.S.A. No. 25
1/4" Pitch Single Width Chain
Type B
Maximum bores shown will accommodate Standard Keyseat and Setscrew over Keyseat.
Slightly larger Bores are possible with no Ks., shallow Ks., or Ss. at angle to Ks.

# Teeth	Outside Diameter	BORE (inches)		HUB (inches)		App. Weight (lbs.)
# Teeth	Outside Diameter	Stock	Rec. Max.	Diameter	Length Through	App. Weight (lbs.)
9	.837	1/4	1/4	7/16	1/2	.03
10	.919	1/4	1/4	1/2	1/2	.03
11	1.002	1/4	5/16	9/16	1/2	.04
12	1.083	1/4	3/8	5/8	1/2	.06
13	1.167	1/4	7/16	23/32	1/2	.07
14	1.246	1/4	9/16	13/16	1/2	.08
15	1.326	1/4	9/16	57/64	1/2	.10
16	1.407	1/4	9/16	31/32	1/2	.12
17	1.487	1/4	5/8	1 1/32	1/2	.14
18	1.568	1/4	3/4	1 1/8	1/2	.16
19	1.648	1/4	13/16	1 7/32	1/2	.19
20	1.729	1/4	7/8	1 9/32	5/8	.25
21	1.809	1/4	7/8	1 3/8	5/8	.28
22	1.889	1/4	15/16	1 7/16	5/8	.31
23	1.969	1/4	1	1 1/2	5/8	.32
24	2.049	3/8	1	1 1/2	5/8	.33
25	2.129	3/8	1	1 1/2	5/8	.34
26	2.209	3/8	1	1 1/2	5/8	.35
28	2.369	3/8	1	1 1/2	5/8	.36
30	2.529	3/8	1	1 1/2	5/8	.38
32	2.688	3/8	1	1 1/2	5/8	.40
36	3.008	3/8	1	1 1/2	3/4	.50
40	3.327	1/2	1 3/8	2	3/4	.53
45	3.725	1/2	1 3/8	2	3/4	.56
48	3.964	1/2	1 3/8	2	3/4	.58

All Steel Sprockets
For A.S.A. No. 35
3/8" Pitch Single Width Chain
Type A
Maximum bores shown will accommodate standard keyseat and set screw over keyseat.
Slightly larger bores are possible with no keyseat, shallow keyseat, or set screw at angle to keyseat.

# Teeth	Outside Diameter	Stock Bore	App. Weight (lbs.)
15	1.990	1/2	.16
16	2.110	1/2	.18
17	2.230	1/2	.21
18	2.350	1/2	.24
19	2.470	1/2	.26
20	2.590	1/2	.29
21	2.710	1/2	.31
22	2.830	1/2	.34
23	2.950	1/2	.38
24	3.070	1/2	.41
25	3.190	1/2	.44
26	3.310	1/2	.46
27	3.430	1/2	.49
28	3.550	1/2	.51
30	3.790	1/2	.59

All Steel Sprockets
For A.S.A. No. 35
3/8" Pitch Single Width Chain
Type B
* has recessed groove in hub for chain clearance.
Maximum bores shown will accommodate standard keyseat and set screw over keyseat.
Slightly larger bores are possible with no keyseat, shallow keyseat, or set screw at angle to keyseat.

# Teeth	Outside Diameter	BORE (inches)		HUB (inches)		App. Weight (lbs.)
# Teeth	Outside Diameter	Stock	Rec. Max.	Diameter	Length Through	App. Weight (lbs.)
8	1.130	3/8	3/8	3/4	3/4	.06
9	1.260	3/8	3/8	27/32	3/4	.10
10	1.380	3/8	9/16	31/32	3/4	.15
11	1.500	3/8	9/16	1 1/16	3/4	.20
12	1.630	1/2	3/4	1 7/32	3/4	.22
13	1.750	1/2	3/4	1 1/4	3/4	.25
14	1.870	1/2	7/8	1 1/4	3/4	.26
15	1.990	1/2	7/8	1 11/32	3/4	.30
16	2.110	1/2	15/16	1 15/32	3/4	.40
17	2.230	1/2	1 1/16	1 19/32	3/4	.43
18	2.350	1/2	1 3/16	1 23/32	3/4	.50
19	2.470	1/2	1 1/4	1 27/32	3/4	.56
20	2.590	1/2	1 5/16	1 15/16	3/4	.68
21	2.710	1/2	1 3/8	2	7/8	.80
22	2.830	1/2	1 3/8	2	7/8	.82
23	2.950	1/2	1 3/8	2	7/8	.87
24	3.070	1/2	1 3/8	2	7/8	.89
25	3.190	1/2	1 3/8	2	7/8	.91
26	3.310	1/2	1 3/8	2	7/8	.93
27	3.340	1/2	1 3/8	2	7/8	.96
28	3.550	1/2	1 3/8	2	7/8	1.00
30	3.790	1/2	1 3/8	2	7/8	1.06

All Steel Sprockets
For A.S.A. No. 41
1/2" Pitch Single Width Chain
Type A
Maximum bores shown will accommodate standard keyseat and set screw over keyseat.
Slightly larger bores are possible with no keyseat, shallow keyseat, or set screw at angle to keyseat.

# Teeth	Outside Diameter	Stock Bore	App. Weight (lbs.)
15	2.650	5/8	.32
16	2.810	5/8	.36
17	2.980	5/8	.40
18	3.140	5/8	.48
19	3.300	5/8	.52
20	3.460	5/8	.57
21	3.620	5/8	.66
22	3.780	5/8	.71
23	3.940	5/8	.76
24	4.100	5/8	.86

All Steel Sprockets
For A.S.A. No. 41
1/2" Pitch Single Width Chain
Type B
* has recessed groove in hub for chain clearance.
Maximum bores shown will accommodate standard keyseat and set screw over keyseat.
Slightly larger bores are possible with no keyseat, shallow keyseat, or set screw at angle to keyseat.

# Teeth	Outside Diameter	BORE (inches)		HUB (inches)		App. Weight (lbs.)
# Teeth	Outside Diameter	Stock	Rec. Max.	Diameter	Length Through	App. Weight (lbs.)
6	1.170	3/8	3/8	21/32	7/8	.16
7	1.340	3/8	3/8	3/4	7/8	.11
8	1.510	1/2	1/2	31/32	7/8	.12
9	1.670	1/2	5/8	1 1/16	7/8	.25
10	1.840	1/2	3/4	1 1/4	7/8	.19
11	2.000	1/2	7/8	1 3/8	7/8	.45
12	2.170	1/2	15/16	1 9/16	7/8	.38
13	2.330	1/2	1	1 9/16	7/8	.50
14	2.490	1/2	1 1/4	1 11/16	7/8	.56
15	2.650	1/2	1 5/16	1 13/16	7/8	.75
16	2.810	5/8	1 3/8	2	7/8	.70
17	2.980	5/8	1 1/2	2 1/8	1	1.00
18	3.140	5/8	1 5/8	2 5/16	1	1.10
19	3.300	5/8	1 3/4	2 1/2	1	1.30
20	3.460	5/8	1 7/8	2 5/8	1	1.56
21	3.620	5/8	1 7/8	2 3/4	1	1.50
22	3.780	5/8	2	2 7/8	1	1.80
23	3.940	5/8	2 1/4	3	1	2.10
24	4.100	5/8	2 1/4	3 1/4	1	2.20

All Steel Sprockets
For A.S.A. No. 40
1/2" Pitch Single Width Chain
Type A
Maximum bores shown will accommodate standard keyseat and set screw over keyseat.
Slightly larger bores are possible with no keyseat, shallow keyseat, or set screw at angle to keyseat.

# Teeth	Outside Diameter	Stock Bore	App. Weight (lbs.)
12	2.170	1/2	.26
13	2.330	1/2	.30
14	2.490	1/2	.34
15	2.650	5/8	.38
16	2.810	5/8	.42
17	2.980	5/8	.30
18	3.140	5/8	.54
19	3.300	5/8	.59
20	3.460	5/8	.68
21	3.620	5/8	.75
22	3.780	5/8	.79
23	3.940	5/8	.89
24	4.100	5/8	.60

All Steel Sprockets
For A.S.A. No. 40
1/2" Pitch Single Width Chain
Type B
* has recessed groove in hub for chain clearance.
Maximum bores shown will accommodate standard keyseat and set screw over keyseat.
Slightly larger bores are possible with no keyseat, shallow keyseat, or set screw at angle to keyseat.

# Teeth	Outside Diam.	BORE (inches)		HUB (inches)		App. Weight (lbs.)
# Teeth	Outside Diam.	Stock	Rec. Max.	Diameter	Length Through	App. Weight (lbs.)
8	1.500	1/2	1/2	31/32	7/8	.10
9	1.670	1/2	9/16	1 1/16	7/8	.18
10	1.840	1/2	3/4	1 1/4	7/8	.20
11	2.000	1/2	7/8	1 3/8	7/8	.25
12	2.170	1/2	1	1 9/16	7/8	.40
13	2.330	1/2	1 1/16	1 9/16	7/8	.43
14	2.490	1/2	1 1/8	1 11/16	7/8	.56
15	2.650	1/2	1 1/4	1 13/16	7/8	.60
16	2.810	5/8	1 3/8	2	7/8	.68
17	2.980	5/8	1 7/16	2 1/8	1	1.00
18	3.140	5/8	1 1/2	2 5/16	1	1.06
19	3.300	5/8	1 3/4	2 1/2	1	1.30
20	3.460	5/8	1 7/8	2 5/8	1	1.56
21	3.620	5/8	1 7/8	2 3/4	1	1.68
22	3.780	5/8	1 7/8	2 7/8	1	1.81
23	3.940	5/8	2	3	1	2.18
24	4.100	5/8	2 1/4	3 1/4	1	2.20