The inside of the drill chuck and the spindle are both threaded, allowing the drill chuck to be screwed onto the spindle, similar to a nut being screwed onto a bolt. Thread-mounted drill chucks can only be used on drills with threaded spindles.

The part on the drill chuck is tapered for insertion into the part inside the drill. One half is built into the drill, and the other is built into the drill chuck. Taper Mounted Drill ChucksĪlso referred to as ‘Jacobs’ or ‘Jacobs Taper/JT’ drill chucks, a taper-mounted drill chuck has an arbor split into two halves. The other end of the arbor attaches to the drill’s spindle. One end of the arbor is built into the drill chuck they cannot be disconnected. Integral Mounted Drill ChucksĪ drill chuck with an integral shank attaches to the body of the drill with a metal bar called an arbor. Each type of drill chuck is only intended to be used with drills that have the corresponding mounting system. They are: integral, tapered, and threaded. There are three possible mounting systems for a drill chuck. Using the key on the drill chuck turns the gear to tighten or loosen the chuck. The key has a matching set of interlocking teeth. Gear teeth are only seen on certain models of keyed drill chuck. Collets are small circles that can be expanded or contracted, tightly holding whatever is inserted into them. Three-jawed drill chucks are sometimes referred to as ‘universal’ chucks. The jaws of a drill chuck are what hold the bit in place. Most drill chucks have three jaws that loosen and tighten in sync, automatically centering the bit. Some of the important drill chuck parts you should know are jaws, collets, gear teeth, and mounting systems.

Tool post drill chuck