Just a note my Schaublin 102N uses W25 collets and it seemed odd to me that Schaublin, even in later years, offered the machines in both W20 and W25 versions. I mean why not just eliminate the W20 and stick with W25 going forward ? It was explained the main reason for this was to match to "legacy" 102 lathes that were W20 spindles.
But after getting in the 102N-VM with W20 spindle I found the W20 collets to be simply more pleasant to deal with...easier to insert, quicker to screw in position, less force required to close them, and easier to remove than the W25 (or 5C for that matter, like on a Hardinge)
So, if you don't need capacity beyond what the W20 offers, I recommend the little buggers....very nice collets !
But after getting in the 102N-VM with W20 spindle I found the W20 collets to be simply more pleasant to deal with...easier to insert, quicker to screw in position, less force required to close them, and easier to remove than the W25 (or 5C for that matter, like on a Hardinge)
So, if you don't need capacity beyond what the W20 offers, I recommend the little buggers....very nice collets !