This 4TB68 Pulley uses a P1-Series Bushing
HCFS210-30 bearing is a 1-7/8" bore four-bolt normal-duty flange bearing that utilizes an eccentric locking device to secure to a 1-7/8" shaft
25V630SK Sheave Dimensions
40A47 sprockets with a stock bore comes with a 23/32" inside diameter plain hole and can be easily machine bored to custom sizes
Dimension (M): 1-25/32"
BK60 Pulley 1" Bore 60B41 Sprockets This 4TB68 Pulley uses aThis BK60 Pulley 1" bore is directly interchangeable with other manufacturers, is 5. 75" in diameter, and is manufactured in accordance with ARPM Standard IP20 for safe operation. It works with belt sizes A, 4L, B, 5L, AX, BX, AA, and BB. What separates this BK60 pulley from the others is that it is made using a high grade 35 cast iron, is phosphate coated, painted, and balanced at the factory. Using the grade 35 cast iron offers a higher tensile