Router Collets
Router Collets and Shaper Collets by Shank Size
A collet clamps the bit shank inside the router, and a worn or wrong-size collet is a common cause of bit slip and runout. This collection spans several brands. Festool collets cover 1/4-inch, 3/8-inch, 1/2-inch, 6mm, 8mm, and 12mm for its OF routers. Makita lists 1/4-inch, 3/8-inch, and 1/2-inch collets plus a 3/8-inch sleeve. Milwaukee and Bosch offer 1/4-inch self-releasing collets. Shaper Tools has 1/8-inch and 8mm collets and 5-piece collet kits. Powermatic and Jet sell 1/4-inch and 1/2-inch collets for their shapers.
What to Look For
- Exact shank size. Match the collet to the bit shank. Never shim a small shank into a larger collet.
- Router or shaper body. Collets are made for specific machines. Check that your model is named.
- Self-releasing design. Self-releasing collets pop the bit free as you loosen the nut, so bits do not stick.
- Replace on wear. Replace a collet that marks shanks or lets bits creep during a cut.
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Router Collets FAQ
Can a 1/2-inch router run 1/4-inch bits?
Yes, with a 1/4-inch collet or a reducer sleeve made for that router. Many full-size routers ship with both sizes. Do not wrap tape or shims around a shank to make it fit.
How often should a collet be replaced?
There is no set interval. Replace it when bits slip, shanks show scoring, or the collet is cracked or bell-mouthed. Clean dust and pitch out of the collet and nut regularly to extend its life.