QWORK ER20 A Collet Clamping Nuts for CNC Milling Chuck Holder Lathe, 4 Pack (Black)

Best item, fast shipping

Revised my review. The collets nuts work fine, my issue was resolved by pushing the collet into the collet nut first, then inserting the CNC bit I wanted to use before installing in the machine spindle. If you try to insert the collet with a bit installed it will not be able to snap into the ride in the collet. After having trouble with these I purchased a $25 Amana collet which looks to be a Chinese collet with a Amana label slapped on the package. Quality looks to be the same as these.

Package arrived early and packaged well. Price was excellent. Appear to be good material and they work well. ER20 hole is concentric.

If you want to make a ton of noise, buy these. They spin so off center, you can hear your spindle bearings screaming for mercy. Absolute garbage.

Great Product, fits and works perfect at a competitive price.

I got tired of swapping collets out of my one spindle nut so I bought these. Now I just leave each size collet in it's own spindle nut. Definitely speeds up tool changes. I did see other reviews complaining about the inside machining was off center. Mine too was off center and for half a minute thought I'd have to return them. But then I inserted a collet and instantly realized the purpose. That off-set hole allows for much easier removal of the collet from the spindle nut. Checked the tool bit with a dial gauge in the spindle and it was right on. My only one complaint is the hex nut shape is a little smaller than the original and my wrenches slip off sometimes but all I need to do is slow down and it's fine.

Very good set of Collet Nuts and at a great price. They worked very well on my ER-20 Spindle. Having multiple collect nuts is a great time saver for any project that requires bit changes.

These fit the machine great , however they vibrated extremely bad. Discontinued using them to keep from harming my cnc.

Bon produit. Livraison tres rapide.

Lo utilizamos para los cabezales porta fresas en una máquina CNC del taller. Ningún problema.

Excelente calidad 👍

Run out buono, montati su elettromandrino 24000 giri.

After reading some of the reviews, I was skeptical about these collet nuts. But to my surprise, the first one I tried was absolutely perfect. I did a warmup run until 24000 rpm. No vibration at all. Didn't try the rest yet, but they seem to be very well balanced. Better than the collet nut that came with my CNC actually! Don't get fooled by the 'off center' hole, that's normal for all these nuts and the balancing actually evens this out.