06-04-16, 04:12 PM
A bit late now, but allen bolts are made from harder material than ordinary drill bits can cope with.
Titanium coatings on HSS are fine for making the bits look pretty and they're ok for anything up to mild steel, but you need tungsten alloy or cobalt alloy bits for drilling high carbon and stainless steels. And a slow drill.
Titanium coatings on HSS are fine for making the bits look pretty and they're ok for anything up to mild steel, but you need tungsten alloy or cobalt alloy bits for drilling high carbon and stainless steels. And a slow drill.