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Graflex M-1 Mount 2761 Screw Size

 
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PeterN



Joined: 27 Aug 2018
Posts: 6

PostPosted: Mon Jan 03, 2022 2:53 am    Post subject: Graflex M-1 Mount 2761 Screw Size Reply with quote

I am trying to mount the Graflex M-1 solenoid mount (#2761) on my Crown Graphic lens board, but my mount did not come with the lens board mounting screws.

Does anyone know what the thread is? I am thinking it is #1-64, but I want to be sure before ordering screws (as they come in 100/pk).

I wish that Graflex didn't use such tiny screws where a more common screw size would have worked just as well.

Regards,

Peter
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45PSS



Joined: 28 Sep 2001
Posts: 4060
Location: Mid Peninsula, Ca.

PostPosted: Mon Jan 03, 2022 8:02 pm    Post subject: Reply with quote

Graflex part number: 30901P1- screw, machine (special) for the clamp;
31190 - screw, machine (special) quantity 2 for the lens board mounting.
30907 for the M3 mount.

They're "special" due to the head being larger than normal.

I have a HR solenoid on a metal board from a 1928 Speed Graphic. Its mount screw is 1-64 x 1/8 with an oversized head.
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PeterN



Joined: 27 Aug 2018
Posts: 6

PostPosted: Thu Jan 06, 2022 4:16 am    Post subject: Reply with quote

Thank you for the reply. I knew the Graflex part numbers, but they rarely gave dimensions to their screws, especially if they were categorized as "special".

I measured the thread pitch of the mount's clamp screw (which I have), which is .4mm. This corresponds to 64 TPI. So is likely #1-64 as a #2-56 screw is slightly too big, and a #0-80 is slightly too small.
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Regards, Peter
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