Hello, I just got this new carbide keyseat cutter and I’m a little stumped as to whether or not I can put it in an ER32 tool holder. There is a large flat running down the entire length of the shank. Unfortunately I didn’t notice this large flat when I ordered it. I was in too much of a hurry and just completely overlooked it.

My question is can I use this in an ER holder or do I need a set screw holder only? Right now I have a HSS cutter in an ER32 holder that this one will replace. I would like to use the same holder but worried that area will not hold it securely, or hold it slightly off center, and/or collapse the collet in that area. At this time I do not have a set screw holder to hold it. Need to get one…

1/2” shank, 1/2” diameter, 1/16” cutter width.

Flat measures about a 1/4” wide across the flat


Thanks!




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