Shimano freehub bolt pitch

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familyguy
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Shimano freehub bolt pitch

Postby familyguy » Fri Jun 22, 2018 2:25 pm

My research skills have let me down. I can't find what the pitch on a Shimano freehub body bolt is.

Anyone know?

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Jim

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MichaelB
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Re: Shimano freehub bolt pitch

Postby MichaelB » Fri Jun 22, 2018 2:47 pm

It's probably 1.5mm pitch, but without a thread file, you'll have to measure.

Get a GOOD steel rule, and measure the distance over 10 teeth, and you'll have your answer.

It may be 1.75mm as well, but you'll see it easily with a good ruler.


PS - pic of a thread file - the saw tooth bit on the end is what you measure it with, and the other bit is to repair the threads.

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familyguy
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Re: Shimano freehub bolt pitch

Postby familyguy » Fri Jun 22, 2018 3:16 pm

OK, so thats one part, they seem fairly coarse. What about diameter? Crank bolts are M12, but I don't have one to test with.

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Duck!
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Re: Shimano freehub bolt pitch

Postby Duck! » Fri Jun 22, 2018 4:02 pm

14x1.
I had a thought, but it got run over as it crossed my mind.

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Warin
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Re: Shimano freehub bolt pitch

Postby Warin » Fri Jun 22, 2018 4:18 pm

familyguy wrote:OK, so thats one part, they seem fairly coarse. What about diameter? Crank bolts are M12, but I don't have one to test with.


You measure the outside diameter of the bolt .. it is usually a little undersized for clearance. And usually runs in 1 mm increments, unusually to find anything other than 1 mm increments. A measurement of 13.8 would be 14 mm.

With nuts you can measure the inside diameter .. and then add twice the pitch .. so a 12 mm inside diameter nut with a 1 mm pitch would be a thread of 14 mm with a pitch of 1 mm . Nuts are much harder as it is very difficult to measure the pitch of the thread. I usually resort to using a screw to determine the pitch - even if it is the wrong (smaller) diameter.

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MichaelB
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Re: Shimano freehub bolt pitch

Postby MichaelB » Fri Jun 22, 2018 4:25 pm

Duck! wrote:14x1.


You'll be pushing the proverbial uphill to find a nut at any non-cycling place. Do you need a replacement ?

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Duck!
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Re: Shimano freehub bolt pitch

Postby Duck! » Fri Jun 22, 2018 7:32 pm

MichaelB wrote:
Duck! wrote:14x1.


You'll be pushing the proverbial uphill to find a nut at any non-cycling place. Do you need a replacement ?

Not sure why one would be looking for a nut to suit, seeing as it threads into the hub shell.
I had a thought, but it got run over as it crossed my mind.

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familyguy
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Re: Shimano freehub bolt pitch

Postby familyguy » Fri Jun 22, 2018 8:13 pm

I want to thread a hub shell for a frankenhub, so 14x1 it is.

Jim

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Duck!
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Re: Shimano freehub bolt pitch

Postby Duck! » Fri Jun 22, 2018 8:25 pm

To rephrase MichaelB, I think you'll be pushing an elephant upstairs trying to find the right tap, because 1mm is pretty fine for a 14mm diameter. Apparently even 10x1 axle thread is unusual.
I had a thought, but it got run over as it crossed my mind.

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familyguy
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Re: Shimano freehub bolt pitch

Postby familyguy » Fri Jun 22, 2018 9:45 pm

With the machine shop stuff I have access to, 14x1 is easy...

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familyguy
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Re: Shimano freehub bolt pitch

Postby familyguy » Fri Jun 22, 2018 10:06 pm

Interestingly, 14x1 seems to be a common thread for muzzle brakes and silencers for rifles...correlation?! 8)

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Ivanerrol
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Re: Shimano freehub bolt pitch

Postby Ivanerrol » Sat Jun 23, 2018 5:51 pm

familyguy wrote:Interestingly, 14x1 seems to be a common thread for muzzle brakes and silencers for rifles...correlation?! 8)


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