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If you need to recess a large bolt when building a deck or other outdoor project, it’s usually a two-step process. This is okay if you only have to hide a few bolts, but if you have to recess a ton of bolts it’d be easier to slide Makita’s counter bore over one of their industrial ship auger bits and do it in one step.

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Slip the counter bore over an auger bit with a 5/8″ diameter shaft, tighten the set screw, and you’re set to hog out a 2-1/2″ hole for recessing the bolt in addition to the through-hole. You can pay anywhere between $45 and $80 for Makita’s slip-on counter bore.

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Counter Bore Collar [Makita]
Street Pricing [Google Products]
Via Amazon [What’s This?]

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8 Responses to Counter Bore For Auger Bits

  1. Shopmonger says:

    Nice, these rock, especially for decks and TREE houses….No not the one in the mesquite bush boys,,,,

    ShopMonger

  2. rob says:

    I have used a router with a bering mounted rabbit bit for this drill hole then rabbit the hole with router even just a trim router works not bad

  3. David Bryan says:

    Do you want to re-think that heading?

  4. Benjamen Johnson says:

    @David Bryan:

    Maybe technically the title should read Bore instead of Sink, but many places seem to use either interchangeably. (I know, I know, I’m repeating their mistake)

    If you’re lost:
    Counter Bore – flat bottomed
    Counter Sink – sloped bottom

    http://www.efunda.com/designstandards/plastic_design/csink.cfm

    —-
    I’ll see what I can do…

  5. David Bryan says:

    Benjamen, stop digging. If they’re using the terms interchangeably they’re using them wrong. Counterboring and countersinking are two different things, and if you’re not that particular about how you use the language you can certainly end up with some interesting results.

  6. w.coffey says:

    c-bore and spotfacing are much more closely related than countersink is to either one. why is it that i can remember that from drafting class 30 years ago and i can’t remember what i had for lunch yesterday?

  7. David Bryan says:

    If you had J. S. McVitty for drafting I can understand why. I’ll certainly never forget that so-and-so.

  8. terry kochan says:

    looking for attachement to fit on 1-1/2″ wood auger bit
    Like to make the hole about 1-5/8″ dia

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