2AK49 Pulley 1-3/8" Bore Takeup Bearing Units First you identify the chain

First you identify the chain pitch to confirm that you are using this on a #140 roller chain

Housing Number: TB 207

UCHA205-16 bearing is a 1" bore normal-duty hanger bearing that utilizes set screws to secure to a 1" shaft

Bearing Size: 6301-2RS

06C Roller Chain Dimensions

2AK49 Pulley 1-3/8" Bore Takeup Bearing Units First you identify the chainThis 2AK49 Pulley 1 3 8" bore is directly interchangeable with other manufacturers, is 4. 75" in diameter, and is manufactured in accordance with ARPM Standard IP20 for safe operation. Because it is a double pulley you can use a double banded A Series v belt, two single A Series v belts, or two single 3L Series v belts. What separates this double 2AK49 pulley from the others is that it is made using a high grade 35 cast iron, is phosphate coated,