DIY store drills are best avoided, buy from someone selling to metalworkers.Īssuming your stud is hardened within ordinary limits, I'd try a TCT drill as offered for drilling stainless steel. HSS coated with yellow TiN, Cobalt (5 or 8%), Coated Cobalt, Carbide Tipped (TCT), solid Carbide, and exotics like Diamond or Boron Nitride. Various choices for these, in rough order of rising hardness and cost. Other hardened metals are too hard for HSS, or at least blunt it rapidly. (Basically pressing hard enough to cut, but not overdoing it. Do you know what it is? Stainless steel work hardens but can be drilled with ordinary HSS provided the right technique is used. To get an idea of what's available, prices and 'good' brands have a look at RS Components. We had one welder who was so good he could build up a pillar on a 3mm stud and successfully get the offending stud out. I have never failed to extract a broken stud in this manner in forty years since I got a mig welder! Use an aluminium bush to prevent the weld and spatter sticking to the surrounding metal.
#5 8 DRILL BIT FOR HARDENED STEEL FREE#
The heat of the weld is almost always enough to free off the stud and is a simple twist-out job. Personally I wouldn't attempt to drill a hardened steel stud unless it was with a drill press or mill and with the component clamped in place.Ī far better way is to build up a pillar of weld on the exposed end of the stud using a mig welder, then when the pillar is high enough to then weld a suitable nut on top of the whole lot. I don't know what your broken stud is screwed in to, aluminium,steel or cast iron. These will be used in an electric hand drill not a pillar drill or lathe.
I want to get 4mm, 6mm and 7.5mm drill bits. I'd appreciate what good brands to look at. What tip angel and helix angle do I need? Seeing references to these on the internet has blown my mind. I think I need cobolt, is this correct 5% or 8%? I am confused as to what type of drill bit I need to drill a hardened steel stud that has snapped due to someone's ham fistedness.
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