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Roller Chain Size Chart

Size Chart / How To Measure Roller Chain

The most important roller chain dimensions to measure is the Pitch (P), Roller Diameter (d1) and Inner Width (b1). These three dimension will help you determine what roller chain size you have.  Below are the roller chain size charts for single, double and triple strand ANSI roller chain.  The last chart is for single strand metric (British Standard) roller chain. You can also look at the side plates as most chain manufacturers stamp the chain size in.

Single Strand ANSI Roller Chain Size Chart

Nitro Chain Number
-
25-1*
35-1*
40-1
41-1
50-1
60-1
80-1
100-1
120-1
140-1
160-1
180-1
200-1
240-1
Pitch
P
1/4
3/8
1/2
1/2
5/8
3/4
1
1-1/4
1-1/2
1-3/4
2
2-1/4
2-1/2
3
Roller Width
b1
1/8
3/16
5/16
1/4
3/8
1/2
5/8
3/4
1
1
1-1/4
1-13/32
1-1/2
1-7/8
Roller Diameter
d1
0.130
0.200
0.312
0.306
0.400
0.469
0.625
0.750
0.875
1.000
1.125
1.406
1.562
1.875
Overall Width
L
0.311
0.488
0.653
0.541
0.815
1.020
1.287
1.590
1.980
2.141
2.551
2.866
3.161
3.760
Pin Diameter
d2
0.091
0.141
0.156
0.141
0.200
0.234
0.312
0.375
0.437
0.500
0.562
0.687
0.781
0.937
Plate Height
h2
0.228
0.346
0.469
0.390
0.585
0.709
0.949
1.188
1.425
1.663
1.889
2.047
2.375
2.791
Plate Thickness
T
0.030
0.050
0.060
0.050
0.080
0.094
0.125
0.156
0.187
0.219
0.250
0.281
0.312
0.375
Average Tensile Strength
LBS
1,000
2,400
3,900
2,833
6,600
9,300
15,600
24,500
35,100
47,600
62,700
76,800
97,000
139,900


Double Strand ANSI Roller Chain Size Chart

Nitro Chain Number
-
35-2*
40-2
50-2
60-2
80-2
100-2
120-2
140-2
160-2
180-2
200-2
240-2
Pitch
P
3/8
1/2
5/8
3/4
1
1-1/4
1-1/2
1-3/4
2
2-1/4
2-1/2
3
Roller Width
b1
3/16
5/16
3/8
1/2
5/8
3/4
1
1
1-1/4
1-13/32
1-1/2
1-7/8
Roller Diameter
d1
0.200
0.312
0.400
0.469
0.625
0.750
0.875
1.000
1.125
1.406
1.562
1.875
Overall Width
L
0.885
1.220
1.531
1.921
2.468
3.007
3.772
4.067
4.854
5.457
5.980
7.220
Pin Diameter
d2
0.141
0.156
0.200
0.234
0.312
0.375
0.437
0.500
0.562
0.687
0.781
0.937
Plate Height
h2
0.346
0.469
0.585
0.709
0.949
1.188
1.425
1.663
1.889
2.047
2.375
2.791
Plate Thickness
T
0.050
0.060
0.080
0.094
0.125
0.156
0.187
0.219
0.250
0.281
0.312
0.375
Average Tensile Strength
LBS
4,400
8,000
13,000
18,400
31,800
49,300
70,700
96,100
126,400
156,200
190,000
282,200

Triple Strand ANSI Roller Chain Size Chart


Nitro Chain Number
-
25-3
35-3
40-3
50-3
60-3
80-3
100-3
120-3
140-3
160-3
180-3
200-3
240-3
Pitch
P
1/4
3/8
1/2
5/8
3/4
1
1-1/4
1-1/2
1-3/4
2
2-1/4
2-1/2
3
Roller Width
b1
1/8
3/16
5/16
3/8
1/2
5/8
3/4
1
1
1-1/4
1-13/32
1-1/2
1-7/8
Roller Diameter
d1
0.130
0.200
0.312
0.400
0.469
0.625
0.750
0.875
1.000
1.125
1.406
1.562
1.875
Overall Width
L
0.827
1.287
1.787
2.244
2.815
3.610
4.417
5.567
5.992
7.157
8.047
8.800
10.681
Pin Diameter
d2
0.091
0.141
0.156
0.200
0.234
0.312
0.375
0.437
0.500
0.562
0.687
0.781
0.937
Plate Height
h2
0.228
0.346
0.469
0.585
0.709
0.949
1.188
1.425
1.663
1.889
2.047
2.375
2.791
Plate Thickness
T
0.030
0.050
0.060
0.080
0.094
0.125
0.156
0.187
0.219
0.250
0.281
0.312
0.375
Average Tensile Strength
LBS
2,800
6,400
11,200
17,400
25,000
44,600
69,600
98,200
133,300
175,400
221,100
273,300
456,420

Single Strand Metric (British Standard) Roller Chain Size Chart



Nitro Chain Number
-
04B
05B
06B
08B
10B
12B
16B
20B
24B
28B
32B
Pitch
P
0.236
0.315
3/8
1/2
5/8
3/4
1
1-1/4
1-1/2
1-3/4
2
Roller Width
b1
0.110
0.197
0.225
0.305
0.380
0.460
670
0.770
1.000
1.220
1.220
Roller Diameter
d1
0.157
0.196
0.250
0.335
0.400
0.475
0.625
0.750
1.000
1.100
1.150
Overall Width
L
0.268
0.350
0.531
0.669
0.772
0.894
1.421
1.701
2.102
2.563
2.654
Pin Diameter
d2
0.072
0.090
0.130
0.175
0.200
0.225
0.326
0.401
0.576
0.625
0.701
Plate Height
h2
0.196
0.280
0.335
0.472
0.579
0.639
0.827
1.039
1.315
1.444
1.661
Plate Thickness
T
0.023
0.030
0.050
0.060
0.065
0.070
0.156
0.177
0.238
0.275
0.276
Average Tensile Strength
LBS
719
1,300
2,300
4,000
5,600
7,200
15,000
23,800
40,000
49,900
62,300