Roller Chain Sprocket Chain No. Circular Pitch Roller Diameter American Standard 0.060 0.090 0.130 0.134 (spec.) (spec.) 25 (spec.) .1227 .1475 1/4 1/4 35 40 41 (spec.) 3/8 1/2 1/2 1/2 0.200 0.313 0.306 0.322 50 (spec.) 60 80 5/8 5/8 3/4 1 0.400 0.313 0.469 0.625 (spec.) 100 120 140 1 1-1/4 1-1/2 1-3/4 0.56253 0.750 0.875 1.000 160 180 200 240 2 2-1/4 2-1/2 3 1.125 1.406 1.563 1.875 (spec.) (spec.) 6 mm 8 mm 4 mm 5 mm British Standard B. S. 228: 1962 36 42 51 61 3/8 1/2 5/8 3/4 0.2500 0.355 0.400 0.475

Module Diametral Pitch Circular Pitch Whole Depth 2.157/DP 2.25/DP 2.20/DP + .002 0.20 0.30 0.35 0.40 127.0000 84.6667 72.5714 63.5000 0.0247 0.0371 0.0433 0.0495 0.0170 0.0255 0.0297 0.0340 0.0177 0.0266 0.0310 0.0354 0.0193 0.0280 0.0323 0.0367 0.45 0.50 0.60 0.70 56.4444 50.8000 42.3333 36.2857 0.0557 0.0618 0.0742 0.0866 0.0382 0.0425 0.0510 0.0594 0.0399 0.0443 0.0531 0.0620 0.0410 0.0453 0.0539 0.0626 0.75 0.80 0.90 1 33.8667 31.7500 28.2222 25.4000 0.0928 0.0989 0.1113 0.1237 0.0637 0.0679 0.0764 0.0849 0.0664 0.0709 0.0797 0.0886 0.0670 0.0713 0.0800 0.0886 1.25 1.50 1.75 2 20.3200 16.9333 14.5143 12.7000 0.1546 0.1855 0.2164 0.2474 0.1062 0.1274 0.1486 0.1698 0.1107 0.1329 0.1550 0.1772         2.25 2.50 2.75 3 11.2889 10.1600 9.2364 8.4667 0.2783 0.3092 0.3404 0.3711 0.1911 0.2123 0.2335 0.2548 0.1993 0.2215 0.2436 0.2657         3.25 3.50 3.75 4 7.8153 7.2571 6.7733 6.3500 0.4020 0.4329 0.4638 0.4947 0.2760 0.2972 0.3185 0.3397 0.2879 0.3100 0.3322 0.3543         4.25 4.50 4.75 5 5.9765 5.6444 5.3474 5.0800 0.5257 0.5566 0.5875 0.6184 0.3609 0.3821 0.4034 0.4246 0.3765 0.3986 0.4208 0.4429         5.25 5.50 5.75 6 4.8381 4.6182 4.4174 4.2333 0.6493 0.8030 0.7112 0.7421 0.4458 0.4671 0.4883 0.5095 0.4651 0.4872 0.5094 0.5315         6.5 7 7.50 8 3.0977 3.6286 3.3867 3.1750 0.8048 0.8658 0.9276 0.9895 0.5520 0.5944 0.6369 0.6794 0.5758 0.6201 0.6644 0.7087         9 10 11 12 2.8222 2.5400 2.3090 2.1167 1.1132 1.2368 1.2606 1.4842 0.7643 0.8492 0.9342 1.0191 0.7972 0.8858 0.9744 1.0630         14 15 16 18 1.8143 1.6933 1.5875 1.4111 1.7316 1.8553 1.9790 2.2263 1.1890 1.2738 1.3588 1.5286 1.2401 1.3287 1.4173 1.5945         20 22 24 25 1.2700 1.1545 1.0583 1.0160 2.4737 2.7211 2.9684 3.0921 1.6984 1.8683 2.0381 2.1230 1.7717 1.9488 2.1260 2.2146