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One more question ISO 40

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Dan Dubeau

Ultra Member
"yes". A "40" taper is a "40" taper. Bt, Cat, ISo, NMTB. Where they differ is the pull stud ends, the v flange, and the drawbar/pullstud thread. The taper is the same though. NT/NMTB has a 1"x1" pilot on the drawbar end. ISO is similar with a 25mm pilot. BT and CAT don't have the pilot. BT and ISO have metric drawbar/pullstud threads. CAT and NMTB have inch. BT and CAT are meant for pull stud retention (think CNC) ISO and NMTB are meant for drawbar retention.

You "can" use bt and cat in an old iso/nmtb spindle with longer drawbar/pullstud adaptor, but you can't use ISO/NMTB in a cat/bt spindle because they need a pull stud for retention.

I think that's the gist of it, if I'm wrong somebody correct me, I'm going off memory, and it ain't that good anymore lol.
 
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Prairie guy

Member
Yes. Manual says ISO 40. Cat 40 seems plentiful and cheaper. Getting different answers from different suppliers when I get quotes. I live a very rural area and 2 hours from most suppliers so I would like to get proper holders at the best prices of course.
 
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Dan Dubeau

Ultra Member
I'm 95.78% sure you could use a cat 40, with a longer 5/8"-11 drawbar. You "may" have to modify the drive dogs on the spindle, but I highly doubt it.

I seem to recall seeing someone(probably on practical machinist) make stubby drawbar adaptor extensions to use cat tooling in ISO/NMTB spindle years ago. That way you could use them interchangeably with ISO tooling, but if you're starting from scratch, I'd just make a new longer drawbar, and go all CAT from the get go. Tooling is dirt cheap, and plentiful on the use market. If you have any ISO tooling you could sell it to offset the cost.

I don't want to lead you down the garden path, as there's a 4.22% chance I'm wrong, but you could probably find a used cat 40 holder for under $30 (plus shipping) to try it out before committing to buying more.
 
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