GT2 Pulley AF-type 32~38 Teeth Timing Pulley Bore=4mm~15mm Tooth width=11 mm Keyway width & Qty(pcs):without keyway & 2 but always refer to your

but always refer to your vehicle's service manual for the exact specification

The bore must match your shaft diameter

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How do I choose the right inner diameter for my fuel line

and 10 mm cover the most common motor and shaft sizes used in DIY automation

GT2 Pulley AF-type 32~38 Teeth Timing Pulley Bore=4mm~15mm Tooth width=11 mm Keyway width & Qty(pcs):without keyway & 2 but always refer to yourGT2 AF Type Timing Pulley Precision 2GT Drive for 3D Printers, CNC & Robotics When your motion system demands repeatable, low backlash power transfer, a poorly matched pulley becomes the weakest link. Engineers, makers, and machine builders who rely on 2GT belt drives need a pulley that holds tight tolerances across every bore size and tooth count without the guesswork of custom machining. These GT2 AF type timing pulleys are designed for exactly that