Catalog    Search    Main Categories > Rigging > Sheaves & Blocks > Sheaves Roller Bearing Sheaves   • McKissick Roller Bearing Sheaves are designed to operate on shafts carburized to 60 Rockwell “C” and ground to + /- .0005 of the indicated shaft size. Some sizes are available with an optional inner race. Check with Crosby Sales for prices and correct shaft size. • Application should provide for 1/32" running clearance over the hub width. • For sizes not listed, McKissick Finished Bore Sheaves can be equipped with Roller Bearings at an optional charge. • Roll Forged sheaves are available in sizes up to 72" in diameter.