12BA clearance

[hornbeam]

Hi Folks, I need to drill some 12BA clearance holes AHve no idea what size drill I need, and ideally Would like to use a metric drill, anyone know what I need?

Thanks,

si

 

[Neil Robinson]

http://www.clag.org.uk/bascrew.html

 

[stockers]

0.051 inch
1.275mm approx.

Try this site. http://www.britishfasteners.com/threads/index.html

 

[hornbeam]

Many thanks guys.

 

[Granitechops]

I know its probably better to use technically prepared tables, but I keep a digital read out caliper to hand,
A, to check the size of the bolt ( they probably got mixed)
B, to check the size of what drills are available