![]() ![]() There are several external difference sin the last photo, what do they actually measure as the 0.02mm you give does not indicate if the large one is the usual 1.25" or if it measures 1.251" They'll have an internal thread too which you often don't get on reproductions. Hardinge are world-renowned for the quality of their collets. Hardinge invented the 5C collet (the 'C' stands for Cataract which is a company Hardinge bought early on) so one thing you can be sure of is if they don't fit it's not the collet that's at fault. I am guessing these will be very hard material & will have to be ground. I've about a 15 imperial ones that need doing So I need to take off 0.02 or there abouts off the bottom of these colletts. The problem being, just after the threaded portion at the bottom, the ones that don't fit are 0.02mm bigger which is stopping the thread from engaging. Which are made by hardinge but stamped differently DO FIT. ![]() all of my collets fit from all different makes and sources etc except these. A while ago I purchased a 5c collet holder from Arc and don't get me wrong there is nothing wrong with it. ![]()
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