Belt pulley options from Grainger can provide positive drive action without slipping, helping make them ideal for timing applications. A gear belt pulley, located inside an internal combustion engine, can disseminate rotational power. A cast iron timing pulley helps prevent speed variation, and along with steel pulleys, can be used for heavy-duty applications. Use a lightweight aluminum belt pulley for applications requiring up to 1/4 HP. Shop Grainger for a synchronous drive gearbelt pulley today.