Allen bolt sizes?

[skubs]

Hi
Coulds someone let me now the standard size of allem bolts for the majority of stems and seat clamps for old school bikes?
Is it M10, M20 ?

cheers

[LXIX]

i doubt very much its a M2o  they are massive twice the sise of your axil threads

[theRuler]

M8 i think mate

[skubs]

thanks ruler - helpful as ever