Originally Posted by NormK
Widget, 1/4 whit is best because it suits the hole size and it is a coarse thread suitable for alloy


Thanks heaps Norm smile.. quick question, how do BSW differ from UNC ? I see UNC has a thread angle of 60* whereas BSW has 55* .. does that make BSW sharper allowing for better/easier tapping ?

These are the BSW Im looking at ordering.. seem to be 1/4-20

http://www.ebay.com.au/itm/BSW-Tap-...te-Plug-from-1-8-1-55-deg-/401090400391?

Thanks again smile