Cable release thread

[Conrad . Marvin]

Wow, Home Depot....and plug style at that!

[JimboWalker]

OK. Which thread tap size is correct? 5-44 or 5-48? I have already ordered a 5-44 and have not received yet. I guess I'l do a test tap in a scrap piece of aluminum and check.

[David Lindquist]

Neither one is "correct " for the Copal shutter's cable release socket but the 5-48 will be closer.

Looking further in to this via google I found the assertion more than once that the Copal shutter may/usually/mostly has a straight rather than tapered thread cable release socket. Looking at a couple of my Copal shutters, this seems to be the case. Googling Copal shutter dimensions brings up drawings showing the cable release socket thread has a major diameter of 3.2 mm with a pitch of 0.5 mm. I have not been able to find an M3.2 x 0.5 tap. A pitch of 0.5 mm is very close to 50 threads per inch, 3.2 mm equals .126 inches. A number 5 machine screw has a major diameter of .125 inches. So the diameter is close and the pitch will be off a bit. I DON'T KNOW IF THIS WILL WORK OR NOT. (Sorry for the caps). May be worth a try since spares are apparently still available.

Now if you could find a 5-50 tap...

David

[Conrad . Marvin]

Your 5-44 will probably grab just fine but checking with a scrap of aluminum is a good idea. Also experiment with a chamfering tool on the beginning of the hole so that the cable release will go in straight . Good luck!

[Conrad . Marvin]

The difference between a .5 mm thread and a 48tpi thread is about .001” from peak to peak. 44tpi Will add .002” . A taper going into a straight thread doesn’t need to mesh perfectly as it will engage in only a couple of threads at most. Give it a try and see if you can make it work.

[RichSBV]

Well, since everyone is now talking about the straight thread and not the tapered one, here's the specs for the staight shutter release threads. I'm trying to attach it here because this is not up on my site yet...

[Steve Goldstein]

FWIW, McMaster-Carr sell JIS threading taps in addition to standard 3mm x 0.5mm metric taps. No 5-48 taps that I could find, though.

https://www.mcmaster.com/taps/jis-thread-taps/

[Tin Can]

Cannot read the specs on my 24" monitor

Would you please post them in text

Thank you

Well, since everyone is now talking about the straight thread and not the tapered one, here's the specs for the staight shutter release threads. I'm trying to attach it here because this is not up on my site yet...

[grat]

Cannot read the specs on my 24" monitor

Would you please post them in text

Thank you

I started to make a snarky comment, and realized I can't read the numbers either. The source resolution is just too low.

[Jim Jones]

Here it is again, rescanned from my copy of the original source.