R8 collet clamping range - is there a standard?

[Alan H.]

I searched for a published industry standard for clamping range for R8 collets. I had no luck finding one.

As always, I found McMaster helpful. They specify a tolerance for what they sell of -.004" to 0". BTW, the 5C's McMaster sells are Lyndex so I would expect their R8's are of the same origin.

Question - is there an industry standard for clamping range for R8 collets? If so, where does one find it? I am guessing there is not one but wanted to ask here.

 

[mksj]

Have not seen anything published, other than it is specified that they do not collapse. Some postings indicate +/-0.002", so they are made to hold dimensionally correct tooling. You could probably call the technical department to see what they recommend.