Second the tip has to be made of carbide so that it can burrow into the stone without shattering.
Drill bit drilling concrete lintel.
For metal lintels start with hss 2 5mm then enlarge to 3 2mm hole and use no.
This type of drill bit has a steel body along with a carbide tip.
For concrete lintels the answer is to start your fixing holes with the smallest masonry drill bit you can get normally 3mm and work up to the size you require.
Drilling into concrete lintels.
Two possible reasons for your problem the first maybe the drill your using lacks the power to go through the lintel and the second if youve managed to go so far in to the lintel you may have come up against the steel bars that give the concrete some of its strength try using a metal bit as well.
So you need something with more strength and roughness.
The best type of masonry drill bit to use for brick or concrete would be the tungsten carbide tip drill bit.
And a masonry drill bit happens to be just the type of bit you want.
These drill bits are the hardest and sturdiest out of all the drill bits.
Drilling into concrete or steel lintels and also fixing into concrete and steel lintels has presented problems for years to diy enthusiasts and professional alike.
First of all it has to be wider than most wood bits with 135 degrees being the most common size.
A drill bit of 3mm is a good place to start and you can then work up from there to get the size of hole you need.
When it comes to concrete the smaller the drill bit the easier it will penetrate.
The secret to concrete drill bits is the tip.
When drilling into a concrete lintel you should start with the smallest drill bit for masonry you have in your set.
For concrete lintel use a decent sds drill with 5 5mm bit and red raw plugs and no.