Collet Chuck, ER20, JT33

I was skeptical about runout on a budget chuck, but this one measured under 0.0002" on my indicator just as advertised. The hardened surface on the JT33 taper looks and feels like it'll last.

Mounted it on my mill and checked the runout with a dial indicator—dead on the 0.0002" spec, so no fiddling with shims. The hardened surface feels solid and the taper seats cleanly every time.

I was skeptical about the runout, but measuring it on a test bar showed it's genuinely within the 0.0002" spec — my finish passes have been noticeably cleaner. The hardened body feels solid in the holder, and the JT33 taper seated nicely on the first try.