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jstevens60 03-18-2010 06:22 PM

Dumb SDS Max question

I have a "1 9/16 inch SDS Max Rotary Hammer"

I've looked around and can't find what the "1 9/16" refers to. Is that the maximum shank size of the bit, or is that the maximum hole size that I can drill into concrete?

Another way to ask the same question: does my rotary hammer accept every single SDS-Max bit under the sun, or are there some SDS-Max bits with shanks larger than my rig can handle?


nap 03-18-2010 07:48 PM



1-9/16 In. SDS-Max Combination Hammer - 10.0 Amp Combination Two-Mode Selector: Rotary Hammer and Hammer Only
10.0 Amp - Impact Energy (ft. lbs.) 5.2
No Load RPM 400 - No Load BPM 3,000
Length 17.25" - Weight (lbs.) 13.2
Max. Hole Diameter in Concrete 1-9/16"
Max. Hole Diameter in Concrete-Core Bit 4"
Max. Hole Diameter in Concrete-Thru Hole Bit 2-1/2"
Optimal Concrete Capacity Range 1/2 - 1-3/8"
Includes Carrying Case
that was from

based on that, I would suggest it is the largest hole suggested to drill in concrete using a standard style bit. Obviously if you use core bits, you can drill larger holes.

Maybe that is the largest masonry drill bit they make with the sds max style arbor.


nope, found a 2" so that's not it. I would guess the largest suggested size standard style drill bit recommended

jstevens60 03-19-2010 01:46 PM

I spoke to a tool guy and he said all SDS Max are a standard shank size, so that makes it easy.

What confused me is that with a "3/8 inch drill" or a "1/2 inch drill", the dimension refers to the max shank size.

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