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This 2BK70 Pulley 3/4" bore is directly interchangeable with other manufacturers v-belt pulleys
Something that sets this 2042B16 sprocket apart from others is that it is Black Oxide Finished
Limiting Speed (Grease): 16000 RPM
Maximum Bore Size: 6-1/2"
While the phosphate coated and then painted finish adds corrosion resistance to the 2BK34 pulley
50BS26 Sprocket With 1-1/4" Finished Bore 2AK39 Pulley This 2BK70 Pulley 3/4" boreThis 50BS26 sprocket featured a 1 1 4" finished bore with a key way and two set screws. It is a durable, high quality, and precision sprocket with hardened teeth. Sprockets that have hardened teeth last longer and are much more durable than those that don't. Something else that is notable about this sprocket is that it fully meets all ANSI Standards, which insures proper contact between the #50 roller chain and sprocket thus preventing premature wear
