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3/A102 is a banded v-belt used on industrial drives - fans and blowers
so a 1065K12 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves
v=1736538561"
so the Megadyne 17/C255 interchanges with Gates
BlackStar H40SH21 - 40 Pitch QD Sprocket - 21 Tooth TL2012 3/A102 is a banded v-beltThe BlackStar H40SH21 is a 40 pitch QD roller chain sprocket with 21 teeth, precision manufactured from SAE 1045 steel with induction hardened teeth for extended wear life and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a QD Type SH Bushing (sold separately). Specifications Part Number H40SH21 Chain Pitch 40 Number of Teeth 21 Maximum Bore 1" Bore Type QD Hub Style QD Bushing Required QD Type SH
