Products for bench top machinists | LittleMachineShop.com

Collet Chuck, ER20, JT33

Collet Chuck, ER20, JT33 - Main image
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$17.72 $23.95 In stock

JT33 to ER-20 collet chuck, milling chuck holder.
This collet chuck is hardened and precision ground and has a T.I.R. is <= 0.0002" (0.005 mm). The chuck will hold all ER-20 collets.

ER-20 collets have a range of 1/16" to 1/2" (1.0 mm to 13.0 mm).

*Collet must be assembled into a collet chuck nut before inserting into the collet chuck.

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Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.6 / 5 · 5 reviews)

Henry V. ★★★★★

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.

Nicholas F. ★★★★★

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.

Eva ★★★★★

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.