BlackStar H10B10 - British Standard Sprocket - #10 Pitch 10 Tooth 3.7/16" 12/5V2120 is a banded v-belt

12/5V2120 is a banded v-belt used on industrial drives - fans and blowers

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so the Megadyne 18/C285 interchanges with Gates

The D&D Global 15/SPB3150 is a standard V-belt featuring Metric SPB (17mm) dimensions

Megadyne 5VX750 Cogged V-Belt

BlackStar H10B10 - British Standard Sprocket - #10 Pitch 10 Tooth 3.7/16" 12/5V2120 is a banded v-beltThe BlackStar H10B10 is a British Standard #10 pitch B Hub roller chain sprocket with 10 teeth, manufactured from steel. British Standard sprockets meet ISO 606 specifications for chain drives in metric and imperial European applications. Plain bore design finish to required shaft size during installation. Specifications Part Number H10B10 Product Type British Standard Sprocket Standard ISO 606 British Standard #10 Chain Pitch #10 Hub Style B Hub