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  #1  
Old Sat 15 February 2014, 01:03
technogod
Just call me: technogod
 
bakersfield
United States of America
Metric 9 screw question.

Hello to all forum members. I am not sure is this the right place to ask my question. If it is not sorry about that.

Why it is so hard to find a metric 9 screw for my THK HSR30 Rails?
I am looking everywhere but even the charts skip number 9

Have no idea do I have to use M8 or do I have to look for more?
Please advice if anybody has any idea.
thanks a lot.
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  #2  
Old Sat 15 February 2014, 02:58
isladelobos
Just call me: Ros
 
Canary Islands
Spain
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The THK HSR30 rails use M8 or M10 Bolts

Here
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  #3  
Old Sat 15 February 2014, 05:47
lonestaral
Just call me: Al #114
 
Isarn
Thailand
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You could use 3/8".
Up to you , the design is very flexible.
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  #4  
Old Sat 15 February 2014, 11:09
technogod
Just call me: technogod
 
bakersfield
United States of America
Thank you guys so much.
3/8'' and 10 mm is too large.8 mm fits but is some lose.9 mm is the perfect size for them but I will use 8 mm tough.
hard to find the metric screws and they are damn expensive..
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  #5  
Old Sat 15 February 2014, 13:34
ger21
Just call me: Ger
 
Detroit, MI
United States of America
Rail holes are 1mm larger than the screw size to allow a small amount of adjustment.
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  #6  
Old Sat 15 February 2014, 14:12
technogod
Just call me: technogod
 
bakersfield
United States of America
Quote:
Originally Posted by ger21 View Post
Rail holes are 1mm larger than the screw size to allow a small amount of adjustment.
yeah. I realize that 9mm is the typical bore size for 8 mm screws.
but what make me curious is that why the charts does not show 9mm screws and hard to find? not a standard?
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  #7  
Old Sat 15 February 2014, 15:29
ger21
Just call me: Ger
 
Detroit, MI
United States of America
Once you get to 8mm, they go up in 2mm increments, 8,10,12,14,16,18,....
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  #8  
Old Sat 15 February 2014, 17:45
technogod
Just call me: technogod
 
bakersfield
United States of America
oh got you. yeah. that's what I thought but I was not sure. Thanks a lot for the info.
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  #9  
Old Sat 15 February 2014, 21:52
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
Metric thread info

I use M9 x 1,0 at my work.
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  #10  
Old Sat 15 February 2014, 21:55
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
Another handy resource

http://littlemachineshop.com/Referen...DrillSizes.pdf
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  #11  
Old Sat 15 February 2014, 23:27
ger21
Just call me: Ger
 
Detroit, MI
United States of America
Where do you get them from? Try Googleing 8mm socket head cap screws. You'll get a million places to get them from.
Then Google 9mm socket head cap screws. None of the links will actually be to 9mm socket head cap screws. If they're available, they're not easy to find.
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  #12  
Old Sun 16 February 2014, 01:59
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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I live in a metric country and have never seen a 9mm metric thread other than on the printed list of potential sizes - if they are available it would only be as a very special order or to be manufactured for a particular job (most probably in the aerospace or medical industry, as normal industry survives on the standard ones available).
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  #13  
Old Sun 16 February 2014, 06:36
isladelobos
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Canary Islands
Spain
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M9 not is an commercial standard.

But is possible make a 9mm bolt or purchase a 9mm bolt or make a 9Xthread.

Last edited by isladelobos; Sun 16 February 2014 at 06:39..
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  #14  
Old Sun 16 February 2014, 09:24
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
My work has them on die sets. Our procurement group acquires them. We mostly deal with Metric & Multistandard but in the past Maryland Metrics was helpful with the hard to find fasteners. I have always called them for the non-listed items. Ford vehicles were notorious for using M9 bolts. Most of the machines I work on are all metric fasteners and in the US I have found it to be painful at times to find them especially the ultra fine pitch.
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  #15  
Old Sun 16 February 2014, 09:46
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
Looking at the HSR30 rail, it specifies M8 for location S with a tap depth of 15.

If you absolutely need a M9 and cannot find one you can definitely machine one. Here is major and minors you will need for a start. http://mdmetric.com/tech/M-thead%20600.htm
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  #16  
Old Sun 16 February 2014, 12:39
technogod
Just call me: technogod
 
bakersfield
United States of America
Quote:
Originally Posted by pblackburn View Post
Looking at the HSR30 rail, it specifies M8 for location S with a tap depth of 15.

If you absolutely need a M9 and cannot find one you can definitely machine one. Here is major and minors you will need for a start. http://mdmetric.com/tech/M-thead%20600.htm
Thank you guys. I will definitely use M8 .
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  #17  
Old Sun 16 February 2014, 14:26
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
If you want to keep it from moving on loose screws try boring it from the back side and put locating pins, screws keep it tight and pins keep it from moving under any force
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  #18  
Old Sun 16 February 2014, 20:23
technogod
Just call me: technogod
 
bakersfield
United States of America
Quote:
Originally Posted by danilom View Post
If you want to keep it from moving on loose screws try boring it from the back side and put locating pins, screws keep it tight and pins keep it from moving under any force
It sounds like a good idea. is this method something you tried before?
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  #19  
Old Mon 17 February 2014, 14:44
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
Friend of mine mounted his 30mm rail using couple of pins instead screws (2-3), nothing wrong with drilling two holes on ends of travel either.
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