Products for bench top machinists | LittleMachineShop.com

Collet Chuck, ER-40, R8, Professional Grade

Collet Chuck, ER-40, R8, Professional Grade - Main image
$78.06 $109.95 In stock

R8 to ER-40 professional grade collet chuck. Premium 20CrMnTi alloy steel hardened and all ground body for extended tool life. Has a superior finish (electrolysis nickel coating).
The maximum RPM is 8,000 and the maximum runout is 0.0002" (0.0051 mm). The R8 drawbar thread is 7/16"-20.
ER-40 collets have a range of 1/8" to 1" (3.0 mm to 26.0 mm).
Spanner wrench is not included. See related products if you need a wrench to fit this collet chuck.
*Collet must be assembled into a collet chuck nut before inserting into the collet chuck.

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Customer Reviews (5.0 / 5 · 5 reviews)

Nicholas F. ★★★★★

The electrolysis nickel coating makes cleaning chips off this chuck effortless, and the hardened alloy steel body gives me confidence on heavier cuts. It's running true within a thou on my mill right out of the box.

Olivia M. ★★★★★

I swapped to this ER-40 collet chuck for my CNC spindle and the 20CrMnTi alloy steel body feels incredibly solid. The nickel coating finish looks clean and resists chips, and the reduced runout compared to my old holder is noticeable. Confidence in the build for my higher-speed work.

Joseph ★★★★★

The runout on this R8 to ER-40 chuck is dead-on, and the hardened body feels solid in the mill. I've used it for a few heavy cuts and the electrolysis nickel finish still looks pristine—no rust or wear after a week of chips and coolant.