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#602467 - 05/25/10 01:19 AM M5 Helicoil - Coarse or Fine and where to get?  
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RedMac Offline
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RedMac  Offline
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West Bend, WI
I just stripped out one of the screw holes on my windshield mount (it doesn't help that I change the windcreen about 10 times a year).

Is the M5 screw a coarse or fine thread? Anyone have a good source for a kit? (I do see Amazon sells them)

Thanks in advance


There are only 10 kinds of people in the world, those who understand binary and those who don't - unknown
----------------------
Mike - IBA #38151
06 R1200RT
99 K1200RS - Gone but not forgotten
#602476 - 05/25/10 01:38 AM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: RedMac]  
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Satguy Offline
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London, Canada
Probably M5 X .8

I dunno.... is there enough "meat" in the windscreen arm to drill out and install a helicoil?

I think I would go up to M6 X 1.0 and just purchase some stainless steel button head cap screws to replace the M5s

Good Luck


Bruce
1200RT(sold)
London, Canada
#602504 - 05/25/10 03:21 AM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: RedMac]  
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workin' them angels Offline
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workin' them angels  Offline
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Indianapolis
Originally Posted By: RedMac
I just stripped out one of the screw holes on my windshield mount (it doesn't help that I change the windcreen about 10 times a year).

Is the M5 screw a coarse or fine thread? Anyone have a good source for a kit? (I do see Amazon sells them)

Thanks in advance


Looks like a m5x16 SI

parts link


Dave
06 R12RT

The point of the journey is not to arrive...
#602543 - 05/25/10 11:23 AM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: workin' them angels]  
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NewBlue Offline
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NewBlue  Offline
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A metric pitch usually changes in quarters. I would guess it's .75 or 1.0mm. Take your bolt to an auto parts store or local garage, they can check it with a pitch gauge. The 16 is probibly the length in mm.
You can measure the length, rotate one revolution, re-measure the length, subtract it from the first reading and get the pitch but that's way to much work.


I'll give you the shirt off my back if you need it but not if you want it.
#602546 - 05/25/10 11:35 AM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: NewBlue]  
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Anton Largiader Offline
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Anton Largiader  Offline
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Virginia
M5x0.8 if it's a standard BMW fairing bolt.

If you are constantly changing that windshield, the helicoil is a good idea anyway.


Anton Largiader, Charlottesville VA
www.largiader.com
#602558 - 05/25/10 12:32 PM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: Anton Largiader]  
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Selden Offline
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Atlanta, GA
Originally Posted By: Satguy
Probably M5 X .8

I dunno.... is there enough "meat" in the windscreen arm to drill out and install a helicoil?

I think I would go up to M6 X 1.0 and just purchase some stainless steel button head cap screws to replace the M5s

Good Luck

Given tales of snapping arms, this was the first thing that I wondered about when reading the question. Assuming there is clearance on the bottom of the support arm, I would be inclined to use a longer screw, with a nut behind. OR, replace the arm.


Don't fix it if it ain't broke, don't break it if you can't fix it.
#602681 - 05/25/10 08:03 PM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: Selden]  
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RedMac Offline
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West Bend, WI
Thanks for all the responses... It is a standard fairing bolt. The kits I've seen either say "coarse thread" or "fine thread". According to this chart an M5 x .8 would be a coarse thread.

http://www.engineershandbook.com/Tables/metrictapdrill.htm

Thanks

I think the arms snapping are the windshield arm support arms (I've already replaced mine with aftermarket ones.)

I'm probably going to replace them all with Helicoils since it is just tapped aluminum.

Last edited by RedMac; 05/25/10 08:06 PM.

There are only 10 kinds of people in the world, those who understand binary and those who don't - unknown
----------------------
Mike - IBA #38151
06 R1200RT
99 K1200RS - Gone but not forgotten
#602768 - 05/26/10 12:47 AM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: RedMac]  
Joined: Feb 2010
Posts: 310
NewBlue Offline
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NewBlue  Offline
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I learned something new today and that's always a good thing. Some really fine thread pitch when you drop to M5 and below. Anyway I pulled a shield screw and it is in fact 5 X .8 The chart I have shows a common pitch for the M5 as either .9 or .8 a call before ordering to get the exact pitch of the helicoil kit could save some time.

Good Luck on the repair.


I'll give you the shirt off my back if you need it but not if you want it.
#602878 - 05/26/10 01:12 PM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: NewBlue]  
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Anton Largiader Offline
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Anton Largiader  Offline
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Virginia
Their use of 'coarse thread' is a bit confusing. I think of it more as standard thread vs fine thread(s). As you can see there are sometimes more than two pitches for a given diameter.


Anton Largiader, Charlottesville VA
www.largiader.com
#602958 - 05/26/10 05:13 PM Re: M5 Helicoil - Coarse or Fine and where to get? [Re: NewBlue]  
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Dick_at_Lake_Tahoe_NV Offline
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Dick_at_Lake_Tahoe_NV  Offline
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Go to your local Napa store. They have a complete kit for about 25-bucks that has the drill, Insertion tool and 8-helicoils.

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