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Metric Roller Chain Size Charts - Complete Chain Dimensions

We've put together metric roller chain size charts to help you easily identify your chain size. The three charts below list complete chain dimensions for single, double & triple metric roller chains.

Quick Tip: The 3 most important dimensions to measure first is the Pitch (P), Roller Diameter (d1) & Inner Width (b1).

Anything labeled special order is available on a per quote basis for resellers & OEM's - Larger MOQ are required. Contact Us for a quote.

Single Metric Roller Chain

single metric roller chain diagram

Dimensions: Inches (Millimeters)

Chain Number Pitch Roller Diameter Inner Width Pin Diameter Link Plate Height Plate Thickness Overall Width Buy 10ft Rolls Buy 50ft Reels
# 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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
Special Order -
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)
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*Uses straight side plates.

Special orders require larger MOQ's

Double Row Metric Roller Chain

double metric chain diagram

Dimensions: Inches (Millimeters)

Chain Number Pitch Roller Diameter Inner Width Pin Diameter Link Plate Height Plate Thickness Overall Width Buy 10ft Rolls Buy 50ft Reels
# 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)
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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)
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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)
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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)
Buy Now Special Order
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)
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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)
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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)
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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)
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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)
Special Order -
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)
Special Order -

*Uses straight side plates.

Special orders require larger MOQ's

Triple Row Metric Roller Chain

double metric chain diagram

Dimensions: Inches (Millimeters)

Chain Number Pitch Roller Diameter Inner Width Pin Diameter Link Plate Height Plate Thickness Overall Width Buy 10ft Rolls Buy 50ft Reels
# 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)
Special Order Special Order
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)
Buy Now Special Order
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)
Buy Now Special Order
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)
Buy Now Special Order
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)
Buy Now Special Order
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)
Special Order Special Order
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)
Special Order -
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)
Special Order -
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)
Special Order -
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)
Special Order -

*Uses straight side plates.