Roller chain dimensions
Main dimensions in inches (mm in brackets). Have the chain in your hand? Identify it automatically with three caliper readings →
| Chain | Size | Pitch p | Roller Ø d1 | Inner width b1 | Plate h2 | Transv. pitch pt |
|---|---|---|---|---|---|---|
| ANSI 25 / 04C | 1/4" x 1/8" | 0.250 (6.35) | 0.130 (3.30) | 0.125 (3.18) | 0.237 | 0.252 |
| ANSI 35 / 06C | 3/8" x 3/16" | 0.375 (9.53) | 0.200 (5.08) | 0.188 (4.77) | 0.356 | 0.399 |
| ANSI 40 / 08A | 1/2" x 5/16" | 0.500 (12.70) | 0.312 (7.92) | 0.309 (7.85) | 0.475 | 0.566 |
| ANSI 50 / 10A | 5/8" x 3/8" | 0.625 (15.88) | 0.400 (10.16) | 0.370 (9.40) | 0.594 | 0.713 |
| ANSI 60 / 12A | 3/4" x 1/2" | 0.750 (19.05) | 0.469 (11.91) | 0.495 (12.57) | 0.712 | 0.897 |
| ANSI 80 / 16A | 1" x 5/8" | 1.000 (25.40) | 0.625 (15.88) | 0.620 (15.75) | 0.950 | 1.153 |
| ANSI 100 / 20A | 1 1/4" x 3/4" | 1.250 (31.75) | 0.750 (19.05) | 0.744 (18.90) | 1.188 | 1.408 |
| ANSI 120 / 24A | 1 1/2" x 1" | 1.500 (38.10) | 0.875 (22.23) | 0.993 (25.22) | 1.425 | 1.789 |
| ANSI 140 / 28A | 1 3/4" x 1" | 1.750 (44.45) | 1.000 (25.40) | 0.993 (25.22) | 1.663 | 1.924 |
| ANSI 160 / 32A | 2" x 1 1/4" | 2.000 (50.80) | 1.125 (28.58) | 1.242 (31.55) | 1.900 | 2.305 |
| ANSI 200 / 40A | 2 1/2" x 1 1/2" | 2.500 (63.50) | 1.562 (39.68) | 1.490 (37.85) | 2.375 | 2.817 |
| ANSI 240 / 48A | 3" x 1 7/8" | 3.000 (76.20) | 1.875 (47.63) | 1.864 (47.35) | 2.850 | 3.458 |
| 05B | 8 x 3 mm | 0.315 (8.00) | 0.197 (5.00) | 0.118 (3.00) | 0.280 | 0.222 |
| 06B | 3/8" x 7/32" | 0.375 (9.53) | 0.250 (6.35) | 0.225 (5.72) | 0.325 | 0.403 |
| 08B | 1/2" x 5/16" | 0.500 (12.70) | 0.335 (8.51) | 0.305 (7.75) | 0.465 | 0.548 |
| 10B | 5/8" x 3/8" | 0.625 (15.88) | 0.400 (10.16) | 0.380 (9.65) | 0.580 | 0.653 |
| 12B | 3/4" x 7/16" | 0.750 (19.05) | 0.475 (12.07) | 0.460 (11.68) | 0.635 | 0.766 |
| 16B | 1" x 17,02 mm | 1.000 (25.40) | 0.625 (15.88) | 0.670 (17.02) | 0.830 | 1.255 |
| 20B | 1 1/4" x 3/4" | 1.250 (31.75) | 0.750 (19.05) | 0.770 (19.56) | 1.040 | 1.435 |
| 24B | 1 1/2" x 1" | 1.500 (38.10) | 1.000 (25.40) | 1.000 (25.40) | 1.315 | 1.904 |
| 28B | 1 3/4" x 1 1/4" | 1.750 (44.45) | 1.100 (27.94) | 1.220 (30.99) | 1.460 | 2.345 |
| 32B | 2" x 1 1/4" | 2.000 (50.80) | 1.150 (29.21) | 1.220 (30.99) | 1.665 | 2.305 |
| 40B | 2 1/2" x 1 1/2" | 2.500 (63.50) | 1.550 (39.37) | 1.500 (38.10) | 2.085 | 2.846 |
| 48B | 3" x 1 3/4" | 3.000 (76.20) | 1.900 (48.26) | 1.800 (45.72) | 2.515 | 3.591 |
Values from ANSI B29.1 and ISO 606. ANSI 25 and 35 are rollerless (bushing) chains: d1 is the bushing diameter.