1960 steering bolt issue ....

I'm pulling apart my power steering since it leaks.

I am in France and have a simple set of 6 point sockets in inches.
Unfortunately I am not sure how to take this bolt off (with a 13mm socket it started ripping the points).
Obviously it has 12 points to it and not 6. I need to buy a 12 pt socket but cant figure out the size... Seems smaller than 1/2 inch... Would anyone know by experience ?

Thanks..

Roland

 

Re: 1960 steering bolt head size issue ....

I tried a 6 point 1/2" and its too big.. I tried a 6 point 7/16" and it seems too small...
I am lost ... What do I need to buy ?

 

12 point 7/16ths.

 

Tom thanks for you help. I realize it was a very amateurish question... but then I am a true amateur... a hard worker and good learner though so in a few years hopefully I will be wiser thanks to people like you and all the great sharing of this board.
Thanks

Roland

 

that looks like an e-torx bolt head like on my saturn astra xr swaybar bushing bracket bolt head..

 

How can I tell the difference ?

Dont these edges look more like a standard 12 point ?