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M10 1.5 or 3/8" x 16 ?

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#1 Jim78154

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Posted 16 March 2015 - 06:55 PM

I have a CG 5 mount that I'm planing to put on a converted surveyors tripod. My question what is is the mounting bolt size and thread pitch. I have been advised by one person by that the correct size is M10 1.5 and by another tnhat the correct size is 3/8" x 16. Can you please tell me what the correct answer is? I don't want to put something in there that is "almost right".



#2 Geo.

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Posted 16 March 2015 - 08:42 PM

M10 -1.50 is the French and DIN standard and used for the CG-5 threaded head retainer. 



#3 Jim78154

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Posted 17 March 2015 - 02:12 AM

Thanks George. You've saved my bacon again!



#4 Jon Isaacs

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Posted 17 March 2015 - 03:10 AM

I just went through this.. As George says the CG-5 does use the metric 10 x 1.5.

 

That said, they are very close, the 3/8" bolt is about 0.019" smaller and the pitch's are very close so the 3/8 -16 bolt will thread in the 10mm x 1.5 but the 10 x 1.5 bolt will not fit the 3/8 but..

 

Jon



#5 SunBlack

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Posted 17 March 2015 - 12:56 PM

I've just bought this to try to adapt a SW Sky Adventurer (which has 3/8") to my Celestron VX tripod, http://www.amazon.co...0?ie=UTF8&psc=1



#6 Jim78154

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Posted 17 March 2015 - 06:18 PM

SunBlack -  I have two questions for your solution. 1. Does this adapt a 3/8" bolt to an M10 1.5 threaded hole, or the other way around, an M10 1.5 bolt to a 3/8" hole? 2. $18+ and plus shipping? Really? Here is what I found for my tripod. It is a one meter long piece of threaded rod with M10 1.5 threads. I just replace the large (7/16"?) surveyors tripod bolt with the threaded rod and it will mount the head and support an eyepiece tray. I got them here for $3.80 + $10 small order fee. I ordered two in case I messed up one of them. If I don't use the second one, I'll put it in the classifieds.


Edited by Jim78154, 17 March 2015 - 06:19 PM.


#7 Agatha

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Posted 17 March 2015 - 06:21 PM

Jim,   ;)   Looking forward to the finished product.  Pictures required... :)



#8 EricR

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Posted 17 March 2015 - 06:54 PM

I've just bought this to try to adapt a SW Sky Adventurer (which has 3/8") to my Celestron VX tripod, http://www.amazon.co...0?ie=UTF8&psc=1

Weird that the header on Amazon says M10 but the description says M12. Picture seems like the inside (female) and outside (male) threads might be a larger difference than 3/8" to M10 but hope it works out for you. If not, I'm sure it's easy to return. Good luck.



#9 SunBlack

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Posted 18 March 2015 - 08:05 AM

yes, good luck to me indeed. my hole (female) is 3/8", male is the metric one.

#10 Jim78154

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Posted 18 March 2015 - 11:05 AM

Lowes and Home Depot are full to the brim with 3/8" hardware. I know for sure that they carry threaded rod in that size in the store. They also have the metric sizes, but you have to special order them and buy eight of them at a time. 



#11 SunBlack

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Posted 19 March 2015 - 01:32 PM

m12x1: Gitzo confirm.....grrrrr
So any adapter on the market
m10x1.5 female m12x1 male?
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#12 EricR

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Posted 19 March 2015 - 02:38 PM

I stole this link from a post by Pinbout in another thread with the same question (I think):

 

http://www.deepspace..._4233_8810.html

 

SunBlack, did you check into that (in that other thread) and find that it wouldn't work? If so, any quick notes on why?



#13 SunBlack

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Posted 19 March 2015 - 05:55 PM

Dunno if Vixen GP m10 is the same of my AVX (which is m10x1,5)



#14 SunBlack

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Posted 21 March 2015 - 02:48 PM

Update: item received. Gitzo was wrong: it is not m12 but m10x1, but i needed m10x1.5 so it is useless.  :undecided:



#15 EricR

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Posted 21 March 2015 - 03:09 PM

Bummer.

Looking at this thread again now, I realize that the 2 goals are exactly opposite:

Jim (OP) has mount with female M10 to adapt to male 3/8" tripod bolt/stud (...or so I'm guessing).

SunBlack has mount with female 3/8" wanting to put on male M10 tripod bolt/stud (...again, I think).

...the metric M10 pitch is "probably" 1.5 for both goals,,, just opposite needs (male vs. female),,, and again, I'm not even 100% sure about the pitch at this point.

 

(((I apologize for convoluting this thread with the adapter link for the opposite goal from what the OP was asking about)))


Edited by EricR, 21 March 2015 - 03:11 PM.


#16 Geo.

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Posted 22 March 2015 - 01:47 PM

Vixen GP is M10-1.5. surveyor is usually 5/8ths UNC. I'd get a M10 bolt and braze a nut to the wrench end and be done with it. You can do some things with allthread complier nuts. Within limits you can bore out the non conforming thread and tap it or use a helicoil.



#17 Jim78154

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Posted 22 March 2015 - 04:56 PM

I believe that I have the surveyor tripod all figured out. You may be right about the 5/8 UNC on the surveyor tripod, but that is pretty much irrelevant to my application. I have a one meter log piece of M10 1.5  all thread. It fits the mount perfectly and I'll just remove the big screw whatever size it is and toss it. I'll then use the all thread to run up through a triangular accessory tray that I'll make and a round mounting plate and into the mount head. The mounting plate is a piece of aluminum 4" across and 1 1/2" thick. I got it for cheap on E-Bay. a 7/16ths inch hole in the center and a few screws placed strategically around the top to orient it and fix it in place will do the rest. I have it all planned out in my head and I'll post some pics when I get it done. 



#18 Geo.

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Posted 23 March 2015 - 11:31 AM

I used to drive 60 miles round trip to the Metals Super Market for aluminum stock, it's a lot cheaper to have eBay purchases delivered.

 

Get yourself a 2" holesaw and bore the plate for the CG-5's socket. It will drop down in about 3/4", add some stability and let you add a fine Az adjustment pin.



#19 Jim78154

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Posted 25 March 2015 - 01:01 AM

2" won't quite do it on my mount George. The plate that I bought, and yes I got it from E-Bay, is a round 4" aluminium plate 1 5/8" thick. the part of the mount that sticks down past the housing on my mount measures 60mm, 2.35". I have drilled a hole through the plate for the 10 mm mounting bolt and will drill and tap another hole for a bolt to replace the finger (AZ adjustment pin). I am planning on using a 1/4" bolt with a nut run all they way down on it to form an extra tall head on it. Judicious filing will even up the nut and head of the new finger for a nice flat surface for the adjustment screws to bear on. I will also place two or three more tapped holes around the top of the plate, inside the mount housing to orient the mount and keep it from moving around too much while tightening the mounting bolt. It should not be too hard to rout out the two inch hole to a depth of 3/4", 19 mm using a drill press and a Dremel tool. The orientation bolts and the the finger I can set just a tiny bit past my scribed lines and then file them down to a snug fit. At least that's the plan. I suppose that this means that I'll have to post photos of the whole operation.



#20 randy_1701

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Posted 13 December 2017 - 07:06 PM

I'm adapting a Manfrotto head to a Craigslist find that involved a new Surveyor's Tripod with a 5/8 - 11 bolt, and the M10 bolt and thread applies to it as well.  Also have an older G-Tech EQ head that may be the same thread, I'll have to compare it to a CG-4 HD complete mount that I have.  I got ahold of some aluminum stock about 3/8 inch thick and am adapting it for the tripod via some creative drill-press work.  I will share how it turns out.

 

Clear Skies,

Randy



#21 slack

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Posted 13 December 2017 - 07:45 PM

It's not clear to me what all is trying to be sussed out here, but perhaps this info, which I have I posted before, might be of interest:

 

A good thing about an astro mount or base with 5/8-11 female thread is that it can easily be converted to the two most common professional photography or videography thread or tie down bolt threads: 3/8-16 or M10 (which is M10 1.5). To convert to 3/8-16, there are inexpensive steel or brass inserts, which are threaded in using a large flat head screwdriver. They are not uncommon in the audio world, so there's a clue as to sourcing. A cool trick to convert to M10 is thread adapters for power tools like orbital sanders or angle grinders. Vermont, DeWalt, Milwaukee, etc. make strong steel adapters available at many hardware stores, which have a hex head and 5/8-11 male threads with different internal threads (M10 1.5 is widely available and what you want for production tripod tie downs or astronomy M10 applications - not 1.25 or 1.00 thread pitch).

I use astro heads on professional Sachtler production tripods (because I already own them). These tripods are for 100mm half-ball heads, which have M10 bolts sticking out of the bottoms (which, interestingly, thread into the German Sachtler heads with 3/8-16 threads - they are a double-ended bolt with a hex somewhere on the shaft and different threads above and below the hex). The tie down and leveling knob is M10 female. A sample is my conversion of a Universal Astronomics 5/8-11 mounting post: Acquire a steel 5/8-11 to M10 1.5 adapter, stainless M10 1.5 x 100mm hex head bolt, one stainless M10 washer, one stainless 5/8-11 washer. Screw 5/8-11 adapter into bottom with stainless washer. From top, thread stainless M10 bolt with stainless washer. I end up with a UA mounting post with an M10 bolt that's about 3-1/2" or so long, plop it down on a 75mm to 100mm bowl adapter plate, and thread on the tie down knob.

 

Going the other direction is less sensible to me. I'm not sure why one would use a photo or production head, most of which will be 3/8-16 or M10, with a surveyor's tripod with a 5/8-11 bolt. However, I believe that most surveyor's tripods I've seen can easily swap the bolt size. If not, there are conversion pucks (female 5/8-11 bottom, male 3/8-16 or other top).




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