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Profile chainring bolt size

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TwoBobRob:
.... can anyone tell me specifically what size the bolt is?   I know its a 7/16" buttonhead bolt, but is it coarse or fine thread - can anyone tell me for certain?

Or is it some wierdo cycle spec thread?

Cheers

Rob

MartyC:
Rob, given it's US made and will be an Imperial size it's probably coarse thread  :daumenhoch:

TwoBobRob:
It does look like it is coarse.  Just wanted to see if anyone knew for deffo as I need to buy a longer version, so it's not going to come from a bike shop...

BigassBMX:
ite rob.

how long do u need it man coz i think i mite have 1 here.

TwoBobRob:
I need it to be double the length of a regular one, so about 1"  (25mm).  I've had to space the crank arm out a mile on my shiity cruiser.......  :(

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