Thread pitch for chainring bolts?

mfh126 · Mar 21, 2013

Can someone please confirm the thread pitch for inner chainring bolts? I know they're size M8 and I believe the thread pitch is 0.75, but I need confirmation please. And if you're wondering why I need to know the thread pitch rather than just ordering a set of inner chainring bolts from a reputable bike shop, I need an extra long (20mm) bolt to use with a set of Sampson cranks and that length is not readily available.

Thanks in advance for the help.

baznav · Mar 21, 2013

Pitch is indeed 0.75.

mfh126 · Mar 21, 2013

Thanks! Now for the impossible task of finding one 20mm long.

Rob H · Mar 22, 2013

Any good:

http://www.namrick.co.uk/acatalog/Home_ ... 2__37.html

I've used Namrick many times in the past for sourcing obscure bolts for old cars

Charlieboy28 · Mar 22, 2013

none in stock at the moment, but these guys will custom make them to your requirements, aint gonna be cheap mind you

http://oscommerce.tibolts.co.uk/product ... cts_id=168

does it have to be 20mm too, as 18 mm is relatively easy to get hold of?

minor_LEGEND · Mar 22, 2013

sjs cycles. use them for making up tandem chainsets.

mfh126 · Mar 23, 2013

Thanks for the help fellas. I'll try Namrick, but they don't specify the thread pitch for the M8 bolts. I'll search SJS next. I already tried Toronto Cycles without any luck.

mfh126 · Mar 23, 2013

Bikepro says it is supposed to be 20mm. I'll see if maybe 18 will work.

Thread pitch for chainring bolts?

mfh126

baznav

Retro Newbie

mfh126

Rob H

Retro Guru

Charlieboy28

minor_LEGEND

Senior Retro Guru

mfh126

mfh126

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