Browning 1VM50-1 Variable Pitch Timing Pulley

Browning 1VM50X1/2 Variable Pitch Timing Pulley is a single-groove, cast-iron pulley from Browning’s VM family, built for fine speed adjustment in belt-drive systems. It features a finished 1/2-inch bore with a keyway for secure shaft mounting and an outside diameter of 4.75 inches, delivering a compact yet capable pulley footprint. This VM-series pulley accepts Browning’s variable-pitch belts across 3L, 4L, 5L, A, and B sections, enabling you to set the effective pitch diameter within the designed VM range for precise RPM control while maintaining proper belt tension and engagement. The variable-pitch design allows the belt to engage a range of belt pitches without swapping pulleys, offering smoother transitions and improved drive stability in applications where exact speed ratios matter. Common uses include small machinery drives, fans, conveyor segments, and other light- to mid-duty equipment where adjustable speed is advantageous. When paired with compatible Browning hardware—such as companion sheaves and MVP accessories—this single-groove VM pulley supports flexible configurations for stepwise or continuously variable speed setups, all while leveraging cast-iron durability and a standard Browning mounting interface. Note that this pulley is designed for belts in the 3L/4L/5L/A/B families and requires a matching shaft bore and mounting hardware to ensure reliable operation.