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Roller chain has been around for a long time and has evolved into a broad range of styles & sizes. Below are roller chain size charts for ANSI, Heavy Series, Metric, Agricultural, Conveyor & Non-Standard chains. Many roller chains are available in multi-strands and we've included charts to cover single strand thru quadruple strand. Each chart includes complete roller chain dimensions with easy-to-read diagrams with reference points.

How To Measure Roller Chain To Identify Size

Measuring roller chain to determine the chain size is quite simple. To start you can download & print a chain template here to record the dimensions that you measure. After you have obtained all the measurements, you'll be able to compare those dimensions to the charts provided below. The three main measurements to look at when comparing are the pitch (P), inner width (b1) & the roller diameter (d1). When you've narrowed down to a size, we recommend that you verify all the remaining specifications.

ANSI Standard Roller Chain Charts

Single Strand
single strand roller chain diagram

Dimensions: Inches

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

* Rollerless chain. d1 = Bushing diameter

Double Strand
double strand roller chain diagram

Dimensions: Inches

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

* Rollerless chain. d1 = Bushing diameter

Triple Strand
triple strand roller chain diagram

Dimensions: Inches

Nitro Chain Number Pitch Inner Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
# P b1 d1 L d2 h2 T
25-3* 1/4 1/8 0.130 0.827 0.091 0.228 0.030
35-3* 3/8 3/16 0.200 1.287 0.141 0.346 0.050
40-3 1/2 5/16 0.312 1.787 0.156 0.469 0.060
50-3 5/8 3/8 0.400 2.244 0.200 0.585 0.080
60-3 3/4 1/2 0.469 2.815 0.234 0.709 0.094
80-3 1 5/8 0.625 3.610 0.312 0.949 0.125
100-3 1-1/4 3/4 0.750 4.417 0.375 1.188 0.156
120-3 1-1/2 1 0.875 5.567 0.437 1.425 0.187
140-3 1-3/4 1 1.000 5.992 0.500 1.663 0.219
160-3 2 1-1/4 1.125 7.157 0.562 1.889 0.250
180-3 2-1/4 1-13/32 1.406 8.047 0.687 2.047 0.281
200-3 2-1/2 1-1/2 1.562 8.800 0.781 2.375 0.312
240-3 3 1-7/8 1.875 10.681 0.937 2.791 0.375
Quadruple Strand
quadruple strand roller chain diagram

Dimensions: Inches

Nitro Chain Number Pitch Inner Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
# P b1 d1 L d2 h2 T
40-4 1/2 5/16 0.312 1.787 0.156 0.469 0.060
50-4 5/8 3/8 0.400 2.244 0.200 0.585 0.080
60-4 3/4 1/2 0.469 2.815 0.234 0.709 0.094
80-4 1 5/8 0.625 3.610 0.312 0.949 0.125
100-4 1-1/4 3/4 0.750 4.417 0.375 1.188 0.156
120-4 1-1/2 1 0.875 5.567 0.437 1.425 0.187

* Rollerless chain. d1 = Bushing diameter

Heavy Series Roller Chain Charts

Single Strand
heavy duty single roller chain diagram

Dimensions: Inches

Nitro Chain Number Pitch Inner Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
# P b1 d1 L d2 h2 T
35H-1* 3/8 3/16 0.200 0.524 0.141 0.346 0.060
40H-1 1/2 5/16 0.312 0.740 0.156 0.469 0.080
50H-1 5/8 3/8 0.400 0.870 0.200 0.585 0.094
60H-1 3/4 1/2 0.469 1.150 0.234 0.709 0.125
80H-1 1 5/8 0.625 1.425 0.312 0.949 0.156
100H-1 1-1/4 3/4 0.750 1.716 0.375 1.188 0.187
120H-1 1-1/2 1 0.875 2.106 0.437 1.425 0.219
140H-1 1-3/4 1 1.000 2.268 0.500 1.663 0.250
160H-1 2 1-1/4 1.125 2.685 0.562 1.889 0.281
200H-1 2-1/2 1-1/2 1.562 3.409 0.781 2.375 0.375
240H-1 3 1-7/8 1.875 4.315 0.937 2.791 0.500

* Rollerless chain. d1 = Bushing diameter

Double Strand
heavy duty double strand roller chain diagram

Dimensions: Inches

Nitro Chain Number Pitch Inner Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
# P b1 d1 L d2 h2 T
60H-2 3/4 1/2 0.469 2.177 0.234 0.709 0.128
80H-2 1 5/8 0.625 2.708 0.312 0.949 0.156
100H-2 1-1/4 3/4 0.750 3.255 0.375 1.188 0.189
120H-2 1-1/2 1 0.875 3.772 0.437 1.425 0.220
140H-2 1-3/4 1 1.000 4.323 0.500 1.663 0.250
160H-2 2 1-1/4 1.125 5.122 0.562 1.889 0.283
200H-2 2-1/2 1-1/2 1.562 6.492 0.781 2.375 0.375
240H-2 3 1-7/8 1.875 8.370 0.937 2.791 0.500
Triple Strand
heavy duty triple strand roller chain diagram

Dimensions: Inches

Nitro Chain Number Pitch Inner Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
# P b1 d1 L d2 h2 T
60H-3 3/4 1/2 0.469 3.204 0.234 0.709 0.128
80H-3 1 5/8 0.625 3.992 0.312 0.949 0.156
100H-3 1-1/4 3/4 0.750 4.795 0.375 1.188 0.189
120H-3 1-1/2 1 0.875 5.952 0.437 1.425 0.220
140H-3 1-3/4 1 1.000 6.378 0.500 1.663 0.250
160H-3 2 1-1/4 1.125 7.560 0.562 1.889 0.283
200H-3 2-1/2 1-1/2 1.562 9.574 0.781 2.375 0.375
240H-3 3 1-7/8 1.875 12.354 0.937 2.791 0.500

Metric Roller Chain Charts

Single Strand
single metric roller chain diagram

Dimensions: Inches (Millimeters)

Chain Number Pitch Roller Diameter Inner Width Pin Diameter Link Plate Height Plate Thickness Overall Width
# P d1 b1 d2 h2 T L
04B 0.236
(6mm)
0.157
(4mm)
0.110
(2.80mm)
0.072
(1.85mm)
0.196
(5mm)
0.023
(0.60mm)
0.268
(6.80mm)
05B 0.315
(8mm)
0.196
(5mm)
0.118
(3mm)
0.090
(2.31mm)
0.280
(7.10mm)
0.030
(0.80mm)
0.322
(8.20mm)
06B* 3/8
(9.525mm)
0.250
(6.35mm)
0.225
(5.72mm)
0.130
(3.28mm)
0.335
(8.20mm)
0.050
(1.30mm)
0.517
(13.15mm)
08B 1/2
(12.70mm)
0.335
(8.51mm)
0.305
(7.75mm)
0.175
(4.45mm)
0.472
(11.80mm)
0.060
(1.60mm)
0.657
(16.70mm)
10B 5/8
(15.875mm)
0.400
(10.16mm)
0.380
(9.65mm)
0.200
(5.08mm)
0.579
(14.70mm)
0.065
(1.70mm)
0.767
(19.50mm)
12B 3/4
(19.05mm)
0.475
(12.07mm)
0.460
(11.68mm)
0.225
(5.72mm)
0.637
(16mm)
0.070
(1.85mm)
0.885
(22.50mm)
16B 1
(25.40mm)
0.625
(15.88mm)
0.670
(17.02mm)
0.326
(8.28mm)
0.827
(21mm)
0.156
(3.96mm)
1.421
(36.10mm)
20B 1-1/4
(31.75mm)
0.750
(19.05mm)
0.770
(19.56mm)
0.401
(10.19mm)
1.039
(26.40mm)
0.177
(4.50mm)
1.626
(41.30mm)
24B 1-1/2
(38.10mm)
1.000
(25.40mm)
1.000
(25.40mm)
0.576
(14.63mm)
1.315
(33.20mm)
0.238
(6.04mm)
2.102
(53.40mm)
28B 1-3/4
(44.45mm)
1.100
(27.94mm)
1.220
(30.99mm)
0.625
(15.90mm)
1.444
(36.70mm)
0.275
(6.99mm)
2.563
(65.10mm)
32B 2
(50.80mm)
1.150
(29.21mm)
1.220
(30.99mm)
0.701
(17.81mm)
1.661
(42.18mm)
0.276
(7.01mm)
2.598
(66mm)

*Uses straight side plates.

Double Strand
double metric chain diagram

Dimensions: Inches (Millimeters)

Chain Number Pitch Roller Diameter Inner Width Pin Diameter Link Plate Height Plate Thickness Overall Width
# P d1 b1 d2 h2 T L
05B-2 0.315
(8mm)
0.196
(5mm)
0.118
(3mm)
0.090
(2.31mm)
0.280
(7.10mm)
0.030
(0.80mm)
0.547
(13.9mm)
06B-2* 3/8
(9.525mm)
0.250
(6.35mm)
0.225
(5.72mm)
0.130
(3.28mm)
0.335
(8.20mm)
0.050
(1.30mm)
0.921
(23.4mm)
08B-2 1/2
(12.70mm)
0.335
(8.51mm)
0.305
(7.75mm)
0.175
(4.45mm)
0.472
(11.80mm)
0.060
(1.60mm)
1.220
(31mm)
10B-2 5/8
(15.875mm)
0.400
(10.16mm)
0.380
(9.65mm)
0.200
(5.08mm)
0.579
(14.70mm)
0.065
(1.70mm)
1.421
(36.10mm)
12B-2 3/4
(19.05mm)
0.475
(12.07mm)
0.460
(11.68mm)
0.225
(5.72mm)
0.637
(16mm)
0.070
(1.85mm)
1.653
(42mm)
16B-2 1
(25.40mm)
0.625
(15.88mm)
0.670
(17.02mm)
0.326
(8.28mm)
0.827
(21mm)
0.156
(3.96mm)
2.677
(68mm)
20B-2 1-1/4
(31.75mm)
0.750
(19.05mm)
0.770
(19.56mm)
0.401
(10.19mm)
1.039
(26.40mm)
0.177
(4.50mm)
3.063
(77.8mm)
24B-2 1-1/2
(38.10mm)
1.000
(25.40mm)
1.000
(25.40mm)
0.576
(14.63mm)
1.315
(33.20mm)
0.238
(6.04mm)
4.003
(101.7mm)
28B-2 1-3/4
(44.45mm)
1.100
(27.94mm)
1.220
(30.99mm)
0.625
(15.90mm)
1.444
(36.70mm)
0.275
(6.99mm)
4.905
(124.6mm)
32B-2 2
(50.80mm)
1.150
(29.21mm)
1.220
(30.99mm)
0.701
(17.81mm)
1.661
(42.18mm)
0.276
(7.01mm)
4.905
(124.6mm)

*Uses straight side plates.

Triple Strand
double metric chain diagram

Dimensions: Inches (Millimeters)

Chain Number Pitch Roller Diameter Inner Width Pin Diameter Link Plate Height Plate Thickness Overall Width
# P d1 b1 d2 h2 T L
05B-3 0.315
(8mm)
0.196
(5mm)
0.118
(3mm)
0.090
(2.31mm)
0.280
(7.10mm)
0.030
(0.80mm)
0.767
(19.5mm)
06B-3* 3/8
(9.525mm)
0.250
(6.35mm)
0.225
(5.72mm)
0.130
(3.28mm)
0.335
(8.20mm)
0.050
(1.30mm)
1.318
(33.5mm)
08B-3 1/2
(12.70mm)
0.335
(8.51mm)
0.305
(7.75mm)
0.175
(4.45mm)
0.472
(11.80mm)
0.060
(1.60mm)
1.775
(45.1mm)
10B-3 5/8
(15.875mm)
0.400
(10.16mm)
0.380
(9.65mm)
0.200
(5.08mm)
0.579
(14.70mm)
0.065
(1.70mm)
2.074
(52.7mm)
12B-3 3/4
(19.05mm)
0.475
(12.07mm)
0.460
(11.68mm)
0.225
(5.72mm)
0.637
(16mm)
0.070
(1.85mm)
2.421
(61.5mm)
16B-3 1
(25.40mm)
0.625
(15.88mm)
0.670
(17.02mm)
0.326
(8.28mm)
0.827
(21mm)
0.156
(3.96mm)
3.929
(99.8mm)
20B-3 1-1/4
(31.75mm)
0.750
(19.05mm)
0.770
(19.56mm)
0.401
(10.19mm)
1.039
(26.40mm)
0.177
(4.50mm)
4.496
(114.2mm)
24B-3 1-1/2
(38.10mm)
1.000
(25.40mm)
1.000
(25.40mm)
0.576
(14.63mm)
1.315
(33.20mm)
0.238
(6.04mm)
5.909
(150.1mm)
28B-3 1-3/4
(44.45mm)
1.100
(27.94mm)
1.220
(30.99mm)
0.625
(15.90mm)
1.444
(36.70mm)
0.275
(6.99mm)
7.252
(184.2mm)
32B-3 2
(50.80mm)
1.150
(29.21mm)
1.220
(30.99mm)
0.701
(17.81mm)
1.661
(42.18mm)
0.276
(7.01mm)
7.212
(183.2mm)

*Uses straight side plates.

Conveyor Roller Chain Charts

Standard
conveyor roller chain diagram

Dimensions: Inches

Nitro Chain Number Pitch Inner Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
- P b1 d1 L d2 h2 T
C2040 1 5/16 0.312 0.653 0.156 0.469 0.060
C2050 1-1/4 3/8 0.400 0.815 0.200 0.585 0.080
C2060H 1-1/2 1/2 0.469 1.150 0.234 0.709 0.125
C2080H 2 5/8 0.625 1.425 0.312 0.949 0.156
C2100H 2-1/2 3/4 0.750 1.716 0.375 1.188 0.187
C2120H 3 1 0.875 2.106 0.437 1.425 0.219
C2160H 4 1-1/4 1.125 2.685 0.562 1.889 0.281
Oversized - Large Roller

Dimensions: Inches

Nitro Chain Number Pitch Inner Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
# P b1 d1 L d2 h2 T
C2042 1 5/16 0.625 0.653 0.156 0.469 0.060
C2052 1-1/4 3/8 0.750 0.815 0.200 0.585 0.080
C2062H 1-1/2 1/2 0.875 1.150 0.234 0.709 0.125
C2082H 2 5/8 1.125 1.425 0.312 0.949 0.156
C2102H 2-1/2 3/4 1.562 1.716 0.375 1.188 0.187
C2122H 3 1 1.750 2.106 0.437 1.425 0.219

Non-Standard Roller Chain Charts

Non Standard Roller Chain Chart

non standard roller chain diagram

Dimensions: Inches

Nitro Chain Number Pitch Roller Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness
- P b1 d1 L d2 h2 T
410 (43 & 65) 1/2 1/8 0.305 0.408 0.142 0.390 0.040
415 1/2 3/16 0.305 0.468 0.142 0.390 0.040
420 1/2 1/4 0.306 0.644 0.156 0.469 0.060
520 5/8 1/4 0.400 0.742 0.200 0.594 0.080