2BK50 Pulley 1-1/8" Bore Variable Pitch Pulleys What separates this 23V280JA sheave

What separates this 23V280JA sheave from the others is that it is made using a high strength cast iron

2040B17 Sprocket

Bearing Insert: UC 212-38

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2BK50 Pulley 1-1/8" Bore Variable Pitch Pulleys What separates this 23V280JA sheaveThis 2BK50 Pulley 1 1 8" bore is directly interchangeable with other manufacturers v belt pulleys, it is 4. 75" in diameter, and is manufactured in accordance with ARPM Standard IP20 for safe operation. double BK pulleys work with belt types A, 4L, B, 5L, AX, BX, AA, BB, double banded A, double banded B, and double banded BX cogged v belts. What separates this double 2BK50 pulley from the others is that it is made using a high grade 35 cast iron, is