Collet Chuck, ER-40, R8, Professional Grade 

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.