Collet Chuck, ER-40, 4" Diameter

Mounting this on my milling table was easy, and the 4-inch diameter gives a solid, stable grip on my 1/2" stock. It holds the workpiece securely without any wiggle during cuts.

I’ve been using this ER-40 collet chuck as a fixture on my milling table, and the 4" diameter gives it a nice solid mounting platform. The 1/8" to 1" collet range covers all the tool shanks I normally use, and the threads were clean enough that it spun on smoothly without any wobble.

Swapped out my old chuck for this ER-40 unit and the 4" diameter gives me plenty of grip range up to 1" stock, which covers most of my jobs. The mount was straightforward, and it runs true enough that I haven’t needed to re-indicate it since.