The 6 Best Router Collets
Editor's Notes
September 19, 2019:
Routers bits might spin the same way drill bits do, but installing one isn't as simple as slapping a #2 Robertson into your impact driver; these accessories require a specialized steel sleeve, known as a collet, to clamp down on them, acting as a medium between the part's shank and the tool's shaft.
Collet contraction is caused by the tightening of a collet nut, which squeezes the part and causes it to grip down on the inserted bit shank. Never attempt to tighten a collet without a bit inserted, as over-contraction and unwanted deformation may occur. Make sure that you have a properly-sized nut for the collet that you’re ordering. If you don’t have an appropriate nut available, we suggest considering an option such as the Porter-Cable 42999 or the Big Horn 19693, which include an integral collet nut.
The vast majority of router bits come equipped with a 1/4-inch or 1/2-inch shank, and as such these sizes were the focus of our rankings. If by chance you’re looking for a collet to accommodate an uncommon 3/8-inch shank, we recommend the Porter-Cable 42975.
If you’re working with a 1/2-inch router, but you have some 1/4-inch bits at your disposal that you’d like to take advantage of, consider investing in a reducer, such as the Whiteside Machine Company 6400 that can fit inside your existing 1/2-inch collet, enabling it to bite down on slighter shanks.