I have to drill about 2025 12mm holes about 150mm deep in a concrete slab. Which is the best concrete drill bit? anyone got any preferences.
budgel,
May 18, 6:12pm
Any good quality SDS 12mm masonry bit should do it, but at over 2000 holes you may need more than one. If it is for breaking out the concrete, maybe check out a concrete cutter.
zak410,
May 18, 6:15pm
Any tungsten bits should do with percussion but I'll be more concerned about your drill burning out with so many hole unless it is a professional type.
Personally I would hire a Hilti type or similar to save a day or so.
kenw1,
May 18, 6:33pm
Woops meant 20 - 25 holes. The block would end up like swiss cheese with that many.
Got a good meaty concrete drill, but find the bits are always the problem, someone said something about diamond tipped bits?
zak410,
May 18, 6:53pm
drill slowly, biggest prob for bits is the reinforcing.
franken1,
May 18, 7:40pm
Have used Irwin SDS Plus bits successfully before. I hope you have an SDS drill or you'll be drilling till the cows come home.
russ18,
May 18, 7:55pm
Had an Ozito sds drill for many years, only paid about $70 new from bunnings, brilliant value for money. Have a more expensive one now and unlike the Ozito it doesn't drill without hammer so no good for core drills. I should have bought another Ozito.
differentthings,
May 18, 11:33pm
If you are only doing 20-25 holes any cheap drill bit should do (you might need 2 or 3). If you are never going to use it again I wouldn't waste money buying a good one.
kenw1,
May 19, 12:25am
That is a thought, I would rather spend a few bob and get a drill bit that allows me to get the job done, in and out, its not a situation where I want to be struggling.
jefrys17,
May 19, 2:57am
the expensiver ones with a 'four head' instead of 'two' are amazing.
unclejake,
May 19, 5:43am
SDS or SDS plus is well worth it IMO. The difference between an SDS and the old standard parallel shank is staggering
franken1,
May 19, 10:58am
4 cutting edges are not necessarily better than 2. Its the quality of the carbide tips that makes the difference.
happychappy50,
May 19, 2:41pm
A good quality SDS will "cut the mustard" still have bits that have seen some pretty harsh treatment & still work well,in fact did a couple of holes into real old concrete last week,was like slicing through butter!Irwin has been my preferred brand for years.Like most things,if you want quality you may have to spend a bit more.
tintop,
May 19, 4:20pm
If it is 'real' concrete hire a Dynadrill or similar -
I
geoff_m,
May 19, 6:23pm
I bought a SDS hammer drill fromTopmaq (their Ingio brand) - best Chinese I assume and no doubt the same as other "brands" from China. The difference between this and my "commercial use" DV20 Hitachi hammer drill is night and day. The SDS is at least 3 times faster than a standard rotary drill with a hammer function, and the chuck doesn't get stuck or loosen off. I got it for 12mm holes for dynabolts and it powered through them. Should have got one ages ago. The cheap drill bits that came with it seem to be lasting ok as well. For the cost of hirage for a day or 2, you can buy one
pestri,
May 20, 7:39pm
Don't buy cheap bits, and expect to use several.
kenw1,
Dec 31, 10:54am
Just to report back.
Did one of the two jobs today, found a SDS drill in the case of my impact breaker thing.
It certainly popped those holes into the concrete, like a hot knife through butter.
Just to be extra sure, put Gorilla Grip under the brackets as well as anchor bolts.
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