What sets this 6207-ZZ bearing apart from others is the ABEC 3 precision standard that this bearing is made to
100BS17 2 3/16" Finished Bore Sprocket Dimensions
Something that sets this 2082B19 sprocket apart from others is that it is Black Oxide Finished
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Bearing Insert: HC 207-21
2BK34H Pulley double-groove 3.55" OD 4" Stock Bore What sets this 6207-ZZ bearingThis two groove 2BK34H Pulley uses an H Series Bushing, is directly interchangeable with other manufacturers, is 3. 55" in diameter, and is manufactured in accordance with ARPM Standard IP20 for safe operation. With AK series pulleys you can use A, 4L, B, 5L, AX, BX, AA, BB, and banded belts. What separates this 2BK34H 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.