Which lathe does a chuck fit?

The mounting follows the spindle nose; Proxxon chucks are made for named models (PD 250/E, PD 400, FD 150/E). The product name and spec table say which.

Can a three-jaw chuck hold square stock?

Three jaws cannot centre a square. Square and irregular work needs a four-jaw independent chuck.

Is the chuck key sold separately?

It normally comes with the chuck; spare keys are listed separately by article number.

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Lathe Chucks

The chuck is what holds the work on the lathe, and the jaw count decides how: three jaws self-centre round and hexagonal stock, four jaws move independently and grip square and irregular work.

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Three jaws or four

A three-jaw chuck is quick: one key moves all three jaws together and round stock seats itself on centre. It is the standard for round and hexagonal work.

In a four-jaw independent chuck every jaw is set separately. Setting up takes longer, but it holds square, rectangular and irregular work — and it is the only way to hold a part deliberately off centre.

Run-out and drill chucks

Run-out is how far the turning part wanders off axis, and it goes straight into the diameter produced. It grows in a three-jaw chuck over time; for precise work, a four-jaw set with a dial indicator, or a collet, is used.

A drill chuck holds twist drills and shafted tools. A keyed chuck covers a wide range; a taper chuck seats directly in the tailstock and is more rigid.

Frequently Asked Questions

Which lathe does a chuck fit?
The mounting follows the spindle nose; Proxxon chucks are made for named models (PD 250/E, PD 400, FD 150/E). The product name and spec table say which.
Can a three-jaw chuck hold square stock?
Three jaws cannot centre a square. Square and irregular work needs a four-jaw independent chuck.
Is the chuck key sold separately?
It normally comes with the chuck; spare keys are listed separately by article number.