The most important dimensions to measure are the Pitch (P), Roller Diameter (d1) and Inner Width (b1). Below are roller chain size charts for ANSI roller chain in single, double and triple strand. It's recommend to use calipers to accurately measure the roller chain. There are many chains that have the same pitch, but have different roller diameters and widths.

Single Strand ANSI Roller Chain Chart

Dimensions: Inches

Nitro Chain Number Pitch Roller Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness Average Tensile Strength Buy 10ft Rolls Buy 50ft Rolls Buy 100ft Rolls
- P b1 d1 L d2 h2 T LBS - - -
25-1* 1/4 1/8 0.130 0.311 0.091 0.228 0.030 1,000 Buy Now Buy Now Buy Now
35-1* 3/8 3/16 0.200 0.488 0.141 0.346 0.050 2,400 Buy Now Buy Now Buy Now
40-1 1/2 5/16 0.312 0.653 0.156 0.469 0.060 3,900 Buy Now Buy Now Buy Now
41-1 1/2 1/4 0.306 0.541 0.141 0.390 0.050 2,833 Buy Now Buy Now N/A
50-1 5/8 3/8 0.400 0.815 0.200 0.585 0.080 6,600 Buy Now Buy Now Buy Now
60-1 3/4 1/2 0.469 1.020 0.234 0.709 0.094 9,300 Buy Now Buy Now Buy Now
80-1 1 5/8 0.625 1.287 0.312 0.949 0.125 15,600 Buy Now Buy Now N/A
100-1 1-1/4 3/4 0.750 1.590 0.375 1.188 0.156 24,500 Buy Now N/A N/A
120-1 1-1/2 1 0.875 1.980 0.437 1.425 0.187 35,100 Buy Now N/A N/A
140-1 1-3/4 1 1.000 2.141 0.500 1.663 0.219 47,600 Buy Now N/A N/A
160-1 2 1-1/4 1.125 2.551 0.562 1.889 0.250 62,700 Buy Now N/A N/A
180-1 2-1/4 1-13/32 1.406 2.866 0.687 2.047 0.281 76,800 Buy Now N/A N/A
200-1 2-1/2 1-1/2 1.562 3.161 0.781 2.375 0.312 97,000 Buy Now N/A N/A
240-1 3 1-7/8 1.875 3.760 0.937 2.791 0.375 139,900 Buy Now N/A N/A

* Rollerless chain. d1 = Bushing diameter

Double Strand ANSI Roller Chain Chart

Dimensions: Inches

Nitro Chain Number Pitch Roller Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness Average Tensile Strength Buy 10ft Rolls Buy 50ft Rolls
- P b1 d1 L d2 h2 T LBS - -
35-2* 3/8 3/16 0.200 0.885 0.141 0.346 0.050 4,400 Buy Now Buy Now
40-2 1/2 5/16 0.312 1.220 0.156 0.469 0.060 8,000 Buy Now Buy Now
50-2 5/8 3/8 0.400 1.531 0.200 0.585 0.080 13,000 Buy Now Buy Now
60-2 3/4 1/2 0.469 1.921 0.234 0.709 0.094 18,400 Buy Now Buy Now
80-2 1 5/8 0.625 2.468 0.312 0.949 0.125 31,800 Buy Now N/A
100-2 1-1/4 3/4 0.750 3.007 0.375 1.188 0.156 49,300 Buy Now N/A
120-2 1-1/2 1 0.875 3.772 0.437 1.425 0.187 70,700 Buy Now N/A
140-2 1-3/4 1 1.000 4.067 0.500 1.663 0.219 96,100 Buy Now N/A
160-2 2 1-1/4 1.125 4.854 0.562 1.889 0.250 126,400 Buy Now N/A
180-2 2-1/4 1-13/32 1.406 5.457 0.687 2.047 0.281 156,200 N/A N/A
200-2 2-1/2 1-1/2 1.562 5.980 0.781 2.375 0.312 190,000 Buy Now N/A
240-2 3 1-7/8 1.875 7.220 0.937 2.791 0.375 282,200 N/A N/A

* Rollerless chain. d1 = Bushing diameter

Triple Strand ANSI Roller Chain Chart

Dimensions: Inches

Nitro Chain Number Pitch Roller Width Roller Diameter Overall Width Pin Diameter Plate Height Plate Thickness Average Tensile Strength Buy 10ft Rolls
- P b1 d1 L d2 h2 T LBS -
25-3* 1/4 1/8 0.130 0.827 0.091 0.228 0.030 2,800 N/A
35-3* 3/8 3/16 0.200 1.287 0.141 0.346 0.050 6,400 N/A
40-3 1/2 5/16 0.312 1.787 0.156 0.469 0.060 11,200 Buy Now
50-3 5/8 3/8 0.400 2.244 0.200 0.585 0.080 17,400 Buy Now
60-3 3/4 1/2 0.469 2.815 0.234 0.709 0.094 25,000 Buy Now
80-3 1 5/8 0.625 3.610 0.312 0.949 0.125 44,600 Buy Now
100-3 1-1/4 3/4 0.750 4.417 0.375 1.188 0.156 69,600 N/A
120-3 1-1/2 1 0.875 5.567 0.437 1.425 0.187 98,200 N/A
140-3 1-3/4 1 1.000 5.992 0.500 1.663 0.219 133,300 N/A
160-3 2 1-1/4 1.125 7.157 0.562 1.889 0.250 175,400 N/A
180-3 2-1/4 1-13/32 1.406 8.047 0.687 2.047 0.281 221,100 N/A
200-3 2-1/2 1-1/2 1.562 8.800 0.781 2.375 0.312 273,300 N/A
240-3 3 1-7/8 1.875 10.681 0.937 2.791 0.375 456,420 N/A

* Rollerless chain. d1 = Bushing diameter