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This is an Iscar tension compression compensation Tapping collet. It is Designed for CNC applications and lathes.
I listed this collet as new old stock because I found it in a box of R8 collets I purchased through an sale site. Not sure how it got in the box but appears to have never been used.
I did give the collet a quick test of the spring tension compression mechanism and it appears to work very well. I tested it by gently pushing and pulling on the top collet. It worked as expected and was very smooth.
The ANSI size listed means it will work with a 3/8” tap or m10.
Thanks for looking and check out my other machinist items listed on .

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