I happen to have a quantity of 7 brand new Hertel TIN 1/2" side-lock end mills but I don't have a imperial side lock holder in BT35 to suit. All my holders are either metric, ER16, DA180, or Clarkson Autolocks.
I can fit the cutters in the DA180 but I realise that the DA's are really only meant for drilling, or I could load them in the Clarkson's but, obviously, without the screwed section engaged. I only want to do a helical interpolation to open out a pilot drilled hole to 19mm but I wondered if either option was safe and, if so, which would be the safest bet.
All the imperial BT35's seem to be in the USA so shipping them across the World seems extreme.
Does anyone have any advice or experience of doing this kind of thing?

Thanks ...Sweep

I use DA's all the time for milling and never had an issue.
Hood

Great stuff!
Thanks Hood. I've just heard stories about milling cutters pulling out but I shouldn't have too much to worry about with my conservative v & a settings. I usually have tooth loading set to half that of maximum as well and I'm only cutting aluminium.

...Sweep

I do a lot of stainless where you want an aggressive feedrate, at the start I always worried that they might pull out but its not happened yet in 6 or 7 yrs. Maybe I crank them up well
Hood

I also use DA 180's and ER collets. Never once had any issue with cutters pulling out. I've also seen technical papers and crap about the capabilities and comparisons of different tooling holders, but honestly, I think those circumstances only come into play when your pushing the extreme boundaries with the holders, as you would in say, a high production setup where every second counts.