What size Threads ?

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What size Threads ?

Post by gfletcher »

Hi Guys

Has anyone got details of the thread sizes and types of threads which are:

a) In the threaded holes on the top face of the OTA (Skywatcher) tube rings.


b) In the Dovetails to which the tube rings are secured.

If they are non standard (i.e not metric) does anyone have a link to a supplier of relevant hex head securing bolts/ socket head bolts.


Meade LX 10 8" SCT OTA, HEQ5,
Celestron X-cel LX 7mm,9mm,12mm,18mm,25mm
Skywatcher Panaview 32mm
Revelation 2" 42mm
William Optics Binoviewer
William Optics SCT Crayford Focuser
Olympus 8X40 DPS I binoculars
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Re: What size Threads ?

Post by Eclipse »

This sort of thing is always a problem. Manufacturers can and do use a mix of standards. I wanted some additional screws for my Stellarvue clamshell - an email to Vic Maris got me the required info - some obscure imperial size thread. A quick google found me a supplier in the UK - only pennies each.
But not all manufacturers are as good at providing the necessary info.
Coronado PST with SME-40 double stack H@ filter
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