Rotary hammer bit in hammer drill?

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Old 05-23-15, 01:45 PM
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Rotary hammer bit in hammer drill?

Can I use a rotary hammer bit in a hammer drill? I need to drill just a few 5/8" holes into concrete. I have a DeWalt drill that has a hammer drill setting. Is there a difference between a normal masonry carbide bit and a rotary hammer bit?
 
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Old 05-23-15, 02:14 PM
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Can I use a rotary hammer bit in a hammer drill?
A hammer drill is a rotary hammer drill. That is the correct bit for that drill.
Is there a difference between a normal masonry carbide bit and a rotary hammer bit
Yes, masonry carbide bit is intended for a regular drill and won't work worth crap usually trying to drill concrete (other types of masonry sometimes it will work). It is not meant for use in a hammer drill. A rotary hammer bit is what you use in a hammer drill.
 
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Old 05-23-15, 02:19 PM
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If you're using a light to medium duty drill you may want to drill a smaller hole first. Maybe 3/8" and then your 5/8" bit.
 
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Old 05-23-15, 06:49 PM
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Going to be a long day trying to drill that big a hole with that type drill.
Going to need a minimum of an SDS style drill.
Home Depot rents them.
 
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Old 05-23-15, 08:59 PM
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You can't use a Rotary Hammer Bit in a Hammer Drill. The bit will fit in the chuck, but your drill doesn't have the power to make any difference, and the bit will just spin in the chuck. You could try it, but you're wasting your time and the bits are expensive.

A Rotary Hammer and Hammer Drill are different.

Here is the Rotary Hammer I have. It accepts SDS Bits as joecaption said. The bits and chuck are splined and will not slip. Rent one as he said, you'll make quick work of the job.

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Old 05-23-15, 09:07 PM
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You can't use a Rotary Hammer Bit in a Hammer Drill. The bit will fit in the chuck, but your drill doesn't have the power to make any difference, and the bit will just spin in the chuck. You could try it, but you're wasting your time and the bits are expensive.
Now I'm confused because I use to do it all the time. I thought they were the same. The older I get the dumber I find out I am.
 
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Old 05-23-15, 09:27 PM
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Far from dumb.
The Hammer Drill looks like a regular drill, but includes a hammering feature. It doesn't have the power to drill through hard concrete, although you might get lucky.

The Rotary Hammer will drill through concrete with no problem. It's the power, and the fact the bits are splined to prevent slipping.
 
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Old 05-29-15, 07:36 AM
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Thanks for all the advice.

I ended up using a DeWalt DW5242 5/8" by 12" carbide hammer drill bit (non SDS) in my 18V DeWalt Hammer Drill. It took about 1 minute for a 4" deep hole and worked quite well, stopping about ever inch to blow the hole out with compressed air.

The bit and drill heated up a bit, but I just let it cool down between holes. Definitely not the solution if you have a lot of holes, but worked well for the 3 I had to do.
 
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