SHEAVE PULLEY BK50 X 5/8" bore for V-belt A,B Hex 2 set screws OD 5" cast Iron 
1 Groove BK50 5/8" Bore Solid  Pulley 5" Outer Diameter
  • Outside diameter: 5" inch
  • Bore: 5/8" inch
  • Belt section size: 4L, 5L
  • 1 Groove
  • One pulley
  • Hex set screws
  • keyway 
BK Finished Bore Sheaves for (4L or A or 5L or B Belts) 
BK Sheaves are accurately machined from fine grained cast iron, statically balanced
They are furbished with Standard Keyseats and Hollow Head Setscrews.
The V-Belts you that can run in this pulley are 4L, A or 5L, B, V-Belts. 
The belt series most common for this pulley is the 4L and A section.