yes

Tony,

ER 16 collets are available in both metric and imperial bore sixes. The outside dimensions are identical so the adaptor you refer to will accept both.

The ER stands for " extended range" meaning that each collet will cope with a range of approx. 1mm (or 0.5mm for smaller sizes). The number quoted for each size is the largest it can accommodate. So a 1/4 collet will happily accept and work with a 6mm cutter and similarly with some other sizes. So if you look at the range carefully you will find that most common metric whole number sizes will be accommodated within the imperial range. I hope this makes sense. I recommend that you look at the Arc website as they offer a full range of ER collets and provide a lot of dimensional inf. I have no connection with Arc other than being a regular and satisfied customer.

Eric

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Tony [et al]

This may be of interest **LINK**

It references E16 rather than ER16, but there is a useful dimensioned drawing at p3.

… I'm sure someone will quickly correct me if the dimensions vary.

MichaelG.

Addendum to my previous post:

This explains the difference between E16 and ER16

MichaelG.

Here is one of my Peatol collets on the left with an ER16 on the right.

Obviously not the same! However they may have changed their spindle design as ER16 is standard and probably cheaper to produce than their own. The ER16 collet is not expensive but the build quality is streets ahead of the Peatol – just look at where the slots in the Peatol are different widths. But I see that Taig now have an ER16 spindle option, which is an obvious upgrade, as well as an adapter that screws on the normal spindle nose and takes ER16 collets.

I have an ER 2 – 16 mm collet set & have bought imperial collets to suit 1/8" – 3/8" & they fit no problem.

George.