BlackStar 3-5V670SK STL - QD Sheave 20M Section The BlackStar 1-3V475SH STL is

The BlackStar 1-3V475SH STL is a 1-groove qd sheave for 3V-section belts

Belt Section B Sub-Type Banded Width 21/32" Thickness 7/16" Length 70 in Number of Bands 4 Material Neoprene Reinforcement Polyester Cord Color Black Temperature Range -30°F to 185°F

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so a 250-S8M-1600 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

3/8VK1500 Banded V-Belt

BlackStar 3-5V670SK STL - QD Sheave 20M Section The BlackStar 1-3V475SH STL isThe BlackStar 3 5V670SK STL is a 3 groove qd sheave for 5V section belts, manufactured from cast iron. Requires a QD Type SK Bushing (sold separately). Specifications Part Number 3 5V670SK STL Product Type QD Sheave Number of Grooves 3 Belt Profile 5V Outside Diameter 6. 70" Bushing Required QD Type SK Bushing Material Cast Iron Approx. Weight 12. 900 lbs Pitch Diameter 67. 0" Compatible Belts 5V Bushing Required This sheave requires a QD Type SK