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-   -   Metric 9 screw question. (http://www.mechmate.com/forums/showthread.php?t=4409)

technogod Sat 15 February 2014 00:03

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 :confused:

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.

isladelobos Sat 15 February 2014 01:58

The THK HSR30 rails use M8 or M10 Bolts

Here

lonestaral Sat 15 February 2014 04:47

You could use 3/8".
Up to you , the design is very flexible.

technogod Sat 15 February 2014 10:09

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..

ger21 Sat 15 February 2014 12:34

Rail holes are 1mm larger than the screw size to allow a small amount of adjustment.

technogod Sat 15 February 2014 13:12

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?

ger21 Sat 15 February 2014 14:29

Once you get to 8mm, they go up in 2mm increments, 8,10,12,14,16,18,....

technogod Sat 15 February 2014 16:45

oh got you. yeah. that's what I thought but I was not sure. Thanks a lot for the info.

pblackburn Sat 15 February 2014 20:52

Metric thread info

I use M9 x 1,0 at my work.

pblackburn Sat 15 February 2014 20:55

Another handy resource

http://littlemachineshop.com/Referen...DrillSizes.pdf

ger21 Sat 15 February 2014 22:27

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.

Alan_c Sun 16 February 2014 00:59

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).

isladelobos Sun 16 February 2014 05:36

M9 not is an commercial standard.

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

pblackburn Sun 16 February 2014 08:24

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.

pblackburn Sun 16 February 2014 08:46

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

technogod Sun 16 February 2014 11:39

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 .

danilom Sun 16 February 2014 13:26

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

technogod Sun 16 February 2014 19:23

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?

danilom Mon 17 February 2014 13:44

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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