What is the diameter of the DW618 motor? Wilson November 12, 2020 16:14 Updated Follow Answer The diameter of the DW618 motor is 3-1/2". Related articles What cord sets are available for the DW616 and DW618 routers? Can other bulbs work in the DEWALT flashlights and floodlights? What accessories are available for the DEWALT DCW600 Cordless Compact Router? Comments 0 comments Please sign in to leave a comment.