Is there a standard for ER20 chuck flats on body?

[lens42]

I just got some TTS ER20 chucks from cncmachinetool on eBay. I’ve ordered before and have been satisfied. These latest ones need a 24mm wrench for the body. The old ones (and Tormach’s) are 22mm across the flats on the body. Are the flats on the body supposed to be a standard? I looked on line and all I see are specs for the nut.


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[GLCarlson]

Body flats are variable.

Build yourself a holder that grabs the 3/4" shaft. A one-way needle bearing clutch bearing from Amazon pressed into a piece of aluminum and bolted to the bench works fine. Tormach sells something like this, or used to.

[popspipes]

I have 2 sets of 10 er20's both are different size bodys/bodies..........

[nitewatchman]

The one way or Sprag Clutch Bearing is by far the best way to go!

https://www.amazon.com/Koyo-RCB-1216...aring+3%2F4%22

Body flats are variable.

Build yourself a holder that grabs the 3/4" shaft. A one-way needle bearing clutch bearing from Amazon pressed into a piece of aluminum and bolted to the bench works fine. Tormach sells something like this, or used to.