BK57 Pulley 15/16" Bore filter_H40BS23 This 6C90F Sheave uses a

This 6C90F Sheave uses a F QD bushing

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This 60BS17 sprocket featured a 1" finished bore with a key-way and two set screws

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BK57 Pulley 15/16" Bore filter_H40BS23 This 6C90F Sheave uses aThis BK57 Pulley 15 16" bore is directly interchangeable with other manufacturers, is 5. 45" 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 BK57 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