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Thread: SDS hammer/drills - what does the spec "1 inch" mean?

  1. #1
    Join Date
    Sep 2006
    Las Cruces, NM

    SDS hammer/drills - what does the spec "1 inch" mean?

    Models of the Bosch Bulldog SDS hammer are advertised as "1 inch" or " 1 1/8 inch". What do those dimensions refer to?
    -obviously not to the diameter of the bit shaft since the following examples both take "SDS plus" bits.
    The Bosch 11255VSR 1 In. SDS-plus® Bulldog™ Xtreme Rotary Hammer is a versatile, handy tool
    The Bosch GBH2-28L SDS-plus® Bulldog™ Xtreme Max 1-1/8 In. Rotary Hammer features a powerful 8.5 Amp motor and KickBack Control.

  2. #2
    Join Date
    May 2018
    Lancaster, Ohio
    I always understood that to be the max size solid bit you should use with that drill. They are rated for larger hollow bits

  3. #3
    Join Date
    Nov 2006
    N.E. Ohio
    It refers to the maximum hole size the tool can drill in concrete.

    Edit - Ron said it more clearly. The maximum solid bit you should solid use - not can use. You can use a 1 1/8" solid bit in a 1" SDS, it will just shorten the life of the tool.
    Last edited by Rich Engelhardt; 07-21-2021 at 7:09 AM.
    My granddad always said, :As one door closes, another opens".
    Wonderful man, terrible cabinet maker...

  4. #4
    Join Date
    Apr 2013
    Okotoks AB
    Yes, it refers to the largest bit that should be used in concrete. But it's just a rough guide because there are so many variables with hardness, type of aggregate, etc. I have Milwaukee's smallest M18 rotary hammer & it drills 1-1/8" holes in block like it's butter, not so much in hard concrete.

  5. #5
    Join Date
    Sep 2016
    Modesto, CA, USA
    FYI My Hilti SDS+ is rated, in old concrete?, with a 1/2" bit at 18" per minute. I know a bigger bit will slow the rate of penetration.
    Bill D

  6. #6
    Join Date
    Feb 2003
    San Antonio, TX
    I picked up a GBH2-28L earlier this year after a neighbor knocked down my stone mailbox. Love the thing. After years of wearing holes in concrete or stone with a regular drill (always felt like it took years to bore a hole ). A rotary hammer is awesome for concrete holes. And it was fun using the chisel to remove the stone mailbox residue. I went with the slightly more expensive one for the vibration control.


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