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Thread size for ASA tube ring holes


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#1 dachurchill

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Posted 19 October 2013 - 04:43 PM

Anyone,

 

I use the standard ASA tube rings for my ASA N16 scope. I was told that the bolts need to fit the threaded holes for mounting plates are M6x1 - alas they are not, which I only found out when I was 640 miles away at my remote observatory with no means of backup.

I will be going back to the observatory again shortly and want to install a plate, so can someone please check their rings (I would guess all the various tube sizes have the same hole spec - I hope) and let me know what the thread pattern needed is.

I will be extremely grateful for anyone who can assist me here.

Thanks

David Churchill



#2 w0mbat

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Posted 19 October 2013 - 10:56 PM

Hi David,

I have just checked my N10 tube rings and the thread size is 5 X 0.8 mm. That is a standard metric thread. Hope this helps.

Ian


ASA DDM60Pro, ASA N10 Astrograph, Orion ED102T CF Refractor, Canon 60Da DSLR, Sirius 2.3 Metre Observatory, WIN10 Pro 64bit.


#3 dachurchill

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Posted 20 October 2013 - 02:07 AM

Ian,

Thanks for this. I appreciate you checking.

On my N16 rings actually M6 was too small, so these must be different. Anyone out there with a N16 who can check please?

 

Regards

 

David



#4 D.Weinzinger

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Posted 21 October 2013 - 09:23 AM

Dear David,

 

Is its a M8.

 

Best regards,

Dietmar Weinzinger



#5 dachurchill

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Posted 23 October 2013 - 04:31 AM

Dietmar,

 

Thank you. this really helps.

 

Is it M8x1.25 (coarse thread)?

 

Regards

David






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