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Need to source a 1/2-13 to 3/8-16 adapter - I'm in the UK

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#1 Rob Willett

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Posted 11 August 2022 - 03:31 AM

Hi,

 

I've just got a second Quickset Samson tripod. This is slightly different to my first Samson as it has a threaded hole in the top of the elevator column. I only found this out when I took the head off it as I don't really need that. I am looking to mount a Skywatcher AZ GTI head on the Samson. This holds a WO ZS61 for AP. This is then a pretty easy combination to put in the car and drive to dark sites.

 

The hole at the top of the column is a 1/2"-13 thread. I know this as I have 3d-printed a bolt to check it. The hole in the bottom of the Skywater is a 3/8"-16.

 

As we have been metric in the UK for 50 or so years, we simply don't access to the non-metric bolts, nuts, thread adaptors that the US has. I've spent the last few hours trying to find something that might work and have failed miserably.

 

Does anyone know where I can get a thread reducer to take the 1/2-13 hole to a 3/8-16? or an adaptor with 1/2"-13 on one end and 3/8"-16? or any other clever ideas.

 

The attached pictures show some idea (though the wrong sizes) of what I'm tryin to find.

 

Thanks very much

 

Rob

Attached Thumbnails

  • Screenshot 2022-08-11 at 09.30.24.png
  • Screenshot 2022-08-11 at 09.29.40.png

Edited by Rob Willett, 11 August 2022 - 05:35 AM.


#2 Michael Covington

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Posted 11 August 2022 - 12:23 PM

The best I can do in a short search is this -- they have female threaded adapters, and you could put short threaded studs in them.

https://www.mcmaster...hread-adapters/

 

You might want to contact that company, and also grainger.com, and ask them what they have.



#3 Michael Covington

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Posted 11 August 2022 - 12:30 PM

A threaded insert to take the larger hole down to the smaller size is easier.

https://www.fastenal...details/0185963

 

I doubt that they are as ugly as they look in the picture!  



#4 tturtle

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Posted 11 August 2022 - 01:27 PM

It might be helpful to see a picture of the 2 pieces you are trying to join. There may be other ways to attach these together.



#5 duck

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Posted 11 August 2022 - 03:52 PM

https://www.truckspr...1-358-0361.aspx

 

is this what you want?



#6 macdonjh

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Posted 11 August 2022 - 03:56 PM

A threaded insert to take the larger hole down to the smaller size is easier.

https://www.fastenal...details/0185963

 

I doubt that they are as ugly as they look in the picture!  

I didn't realize they were made for diameters that close together.  I was going to suggest looking for a heli-coil.



#7 PETER DREW

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Posted 11 August 2022 - 05:58 PM

Rob.  I can make you a connector of the type shown in the larger image.  I'm in the UK, send me a PM.


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#8 Rob Willett

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Posted 12 August 2022 - 03:34 AM

The best I can do in a short search is this -- they have female threaded adapters, and you could put short threaded studs in them.

https://www.mcmaster...hread-adapters/

 

You might want to contact that company, and also grainger.com, and ask them what they have.

Michael,

 

Thanks for this. The hex bolt to join together is great for rods but I have the opposite problem. As previously requested here's a picture of the top of the Quickset tripod, so the reducing nut doesn;t work.

 

Best wishes

 

Rob

Attached Thumbnails

  • Quickset top.jpg


#9 Rob Willett

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Posted 12 August 2022 - 03:36 AM

A threaded insert to take the larger hole down to the smaller size is easier.

https://www.fastenal...details/0185963

 

I doubt that they are as ugly as they look in the picture!  

Michael,

 

I did find these earlier, the nastiness is the locking stuff that is on the adaptor and is not that big a deal as it can be removed, probably by soaking it in a solvent before using it. The problem again is getting shipping to the UK.

 

I did find one place and they wanted $60 to ship a $6 bolt. Didn;t take them up.

 

Thanks

 

Rob



#10 Rob Willett

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Posted 12 August 2022 - 03:38 AM

https://www.truckspr...1-358-0361.aspx

 

is this what you want?

Duck,

 

This is pretty close to it. $12 is fine, the shipping cost is rather high smile.gif

 

Rob

Attached Thumbnails

  • Screenshot 2022-08-12 at 09.37.38.png


#11 Rob Willett

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Posted 12 August 2022 - 03:40 AM

I didn't realize they were made for diameters that close together.  I was going to suggest looking for a heli-coil.

The helicoil seems a good answer but again its difficult to find helicoils in Europe (never mind the UK) for these sizes. I have a garage full of metric bolts, M2 upwards to M12 (2mm to 12mm) but nobody really sells non metric stuff anymore. Everybody has standardised on metric so UNC and non metric stuff is very difficult to find.

 

Thanks

Rob



#12 Rob Willett

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Posted 12 August 2022 - 03:41 AM

Rob.  I can make you a connector of the type shown in the larger image.  I'm in the UK, send me a PM.

Peter,

 

Thanks for the offer. I'll PM you now.

 

Best wishes

 

Rob



#13 PETER DREW

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Posted 12 August 2022 - 04:16 AM

Rob.  I can make a disk with 3/8 thread one side and 1/2" the other, what size disc would be best for your purpose?



#14 Rob Willett

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Posted 12 August 2022 - 04:27 AM

Peter,

 

Thats very kind of you,. The bottom of the Skywatcher is 81mm so would 85mm be OK.

 

It's a 3/8-16 thread on the bottom of the Skywatcher. The 3/8"-16 hole is at least 12mm deep. The 1/2"-16 hole is at least 20mm deep but suspect it's around 100mm :)

 

The offer in the DM is still there. Please let me know,.

 

many thanks

 

Rob



#15 luxo II

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Posted 12 August 2022 - 05:50 AM

Rob try www.accu.co.uk (suggest call them and ask, since you're in the same country).

 

I've ordered all sorts of stuff from them and the postage - even to my end of the planet - has been entirely reasonable, with fast service.


Edited by luxo II, 12 August 2022 - 05:52 AM.


#16 Rob Willett

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Posted 12 August 2022 - 07:41 AM

Rob try www.accu.co.uk (suggest call them and ask, since you're in the same country).

I've ordered all sorts of stuff from them and the postage - even to my end of the planet - has been entirely reasonable, with fast service.


That’s a new company to me. Will look through and see if anything jumps out.

Thanks

Rob

#17 Steve Dodds

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Posted 13 August 2022 - 08:27 PM

You could fill the hole with epoxy (JB Weld) then drill and tap the hole you want



#18 Rob Willett

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Posted 22 August 2022 - 07:12 AM

I didn't realize they were made for diameters that close together.  I was going to suggest looking for a heli-coil.

 


@steve Dodds

 

Peter has kindly made me an adaptor that fits. Great fit and very pleased.

 

the chances of me NOT cocking up JB-Weld, a vertical drill and then a subsequent tap on it, is so close to zero as to be zero. I know my limits

 

Thanks

Rob




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