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#1
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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. |
#3
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You could use 3/8".
Up to you , the design is very flexible. |
#4
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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.. |
#5
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Rail holes are 1mm larger than the screw size to allow a small amount of adjustment.
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#6
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Quote:
but what make me curious is that why the charts does not show 9mm screws and hard to find? not a standard? |
#7
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Once you get to 8mm, they go up in 2mm increments, 8,10,12,14,16,18,....
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#8
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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
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#10
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#11
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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. |
#12
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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
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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 05:39.. |
#14
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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
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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 |
#16
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Quote:
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#17
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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
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It sounds like a good idea. is this method something you tried before?
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#19
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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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