QWORK 4 delige ER20-A type M25 spantangen, zeskantmoeren voor CNC-freeshouderhouder, zwart

Sceptical of a previous review by a user of this product I held off on testing these as they claimed to be unballanced.To my surprise these ER20 nuts are very well balanced and nothing of it is "off center" other then the intended design of this nut.Running at 24000 RPM without a single issue and would buy again in my books!

The inner hole is out of center. This makes the nut unbalanced. Even at very low rpm, the spindle starts to vibrate. I think it might even be dangerous to run at normal CNC rpm (more than 10.000). For sure it is very bad for the motorbearings and using this with thin mills will break the mill because there is way too much runout.I would advise strongly against buying this product.I have returned it immediately

materiale ok e rapidissimo grazie

I have a hobby cnc in my shop and was getting really tired of swapping collets out of the nuts all the time when using multiple bits on a project. Getting a set of these nuts let's me have all my common collet sizes in their own nuts, saving me time and annoyance.

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

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

Only one nut was out of balance and could not be used, 3 was usable and 4 was 100% okay.