Hi All

OK this better be right you made me go to my shop twice !@#@*!!!
I have a Oneway Chuck and the adapter I use is for a shopsmith, the
shopsmith has a plain shaft, (no thread) and the adapter has to hold
with the set screw, my adapter has a set screw, and it is a 5/16X18NC
NOT I SAY AGAIN, NOT 8 mm or as you say a M8, I grew up with both metric
and imperial, and know of the sometimes very close sizes in relation to
each other, that is why I after checking my adapter, and reading your
post, I went back to make sure, used thread pitch gauge, taps and dial
caliper, and am sure it is not M8X1.25 or M8X1.00, but 5/16"X18NC.

BTW the numbers M6, M8,M9, M10,M12, etc. is the Diameter bold, so M6 is
6mm D. and M16 is 16mm D.
The other numbers like 0.90 or 1.00 or 1.25 etc. is the thread pitch,
0.90 tells you the thread pitch is 0.9 mm, and M12X1.75 would mean a
12mm bold with a 1.75 mm pitch thread
As in imperial 18NC or 24 NF where they would tell you the number of
thread per inch on your bold, were 3/8X16NC would tell you it's a 3/8D
bolt with 16 TPI thread.
Hope this makes things a bid more clear.


Ron Kolakowski wrote:
I just upgraded my lathe, and replaced the tapered adapter on my
Stronghold Chuck. (I believe it's the same adapter as the Talon). The
new adapter did not come with set screws, and since my new lathe is
reversible, I asked Oneway about them. Here's the response -

"The set screws are M8. We stopped including them as people were using
them on spindles which were not built for set screw locking and
damaging their spindles and then blaming us."

Seems that reversible lathes have an unthreaded portion at the
headstock end of the spindle, and others don't. At least my jet 1236
didn't.

I went to Lowes and bought M8 1.25 x 16 socket head cap screws. I
haven't tried them yet, but the 16mm length might be a tad too short.
I'll know for sure when my lathe gets here.