Is this a M10 thread or....? - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 9 (permalink) Old 08-31-2020, 11:49 AM Thread Starter
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Is this a M10 thread or....?

Hello!
I'm trying to make a phone holder using this left mirror mount hole. I think is a perfect place and it should get solid. I got some bolts and nuts and plates but the M10 bolt goes just 2mm in and than.... nothing. It doesn't go any further. I only used my fingers, donn't want to force the thread before I'm sure it is a M10 size. Ideeas?
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post #2 of 9 (permalink) Old 08-31-2020, 11:52 AM Thread Starter
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post #3 of 9 (permalink) Old 08-31-2020, 12:12 PM
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This thread (no pun intended) may help...
https://www.fjrowners.com/forums/9-f...ed-thread.html

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post #4 of 9 (permalink) Old 08-31-2020, 01:06 PM
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That hole does take a M10 bolt with a 1.25 (fine) thread pitch. RAM part number RAM-B-349U, if you're interested. Perhaps you're trying to use a M10 bolt with a 1.5 (coarse) thread pitch.

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post #5 of 9 (permalink) Old 08-31-2020, 02:32 PM
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I use a Ram mount on my left side (mirror hole) and it is solid enough, but is closer to my face than I would like and obscures some of the buttons on the left side. When I got the bike, the Ram mount was already installed in the center of the triple clamp, but I put a GPS and moved the phone holder to the left side. The Ram mount has a ball on top and the screw on bottom.
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post #6 of 9 (permalink) Old 09-01-2020, 03:27 AM Thread Starter
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Thank you guys!
Why on Earth would Yamha do this? Why not the usual M10 (1.5)?
I think the RAM Mounts are overpriced. I'll see what I can do (probably will end up buying Ram mounts 😄 )
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post #7 of 9 (permalink) Old 09-01-2020, 01:12 PM
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As @Haynes has pointed out above.. an M10 1.25 works. It worked for me as well.
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post #8 of 9 (permalink) Old 09-01-2020, 08:51 PM
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Quote:
Originally Posted by TheBigG View Post
Why on Earth would Yamha do this? Why not the usual M10 (1.5)?
Bolts of different thread pitch are not un-usual. To the best of my knowledge M10 bolts come in 3 pitches: 1.5, 1.25, and 1.0, which correspond to coarse, fine, and very fine. Other metric bolts come in a range of thread pitches too: the M12 comes to mind. I am not an engineer but I'm sure there are good reasons to use one thread over another.

RAM mounts and parts might be spendy, but they work.

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post #9 of 9 (permalink) Old 09-07-2020, 11:35 PM
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I believe it has to do with the amount of torque the bolt can take, or TPI (threads per inch). Take the M10 in question, depending on the grade of threads or pitch, if I am not mistaken, they can withstand 3 different torque values accordingly. I maybe way off here but that was always my understanding

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