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Internal Micrometer

And you thought taper gauges were an expensive way to measure hole diameters — these internal micrometers from Brown & Sharpe offer a whole new perspective on “expensive.” They start at $450 a tool, but you’re probably going to need a bunch of ’em because they only measure diameter within a narrow range, i.e. you need a separate micrometer for 5-6 inches, 6-7 inches, etc…

The Intrimik measuring arms move in and out of the micrometer perpendicular to the spindle to precisely gauge inside diameter. For all of their internal micrometers within the .275″ to 4.00″ range they make the contact points from hardened steel with a surface hardness of 770 HV, while instruments in the 4″ to 12″ range feature tungsten carbide inserts with a 1,300 HV surface hardness.

Internal Micrometer [Brown & Sharpe]
Street Pricing [Google Products]


4 Responses to It’s Just Cool: Internal Micrometer

  1. ShopMonger says:

    I have a set of these, great tools….

    If you get into high performance engine building they come in handy real fast…
    You can alos get a set that has screw on extensions to make the kit cheaper and alot smaller. The extension go on the measuring arma nd make the measuring arm longer by incrimental sixes 1″ 2″ 3″ ect

    yes they are not cheap , but oh boy what fun…..
    Infact my father, who is a retired race car driver, has a couple set s of these from when he used to build his own engines…

  2. John says:

    Okay, that fills my wish list. Everyone I know can pitch in together and get me just one and I’d be happy.

    Where can you find the extendable version??

    Is this anything like the $270 internal mikes on page 326 of the Enco catalog?

  3. John Shea says:

    Kid of limited aren’t they? What if you want to measure a slot? I use the Starrett rod style inside micrometer for most internal measurements. For less than $200 you can get 2-8 inches. It is limited to .001 so if I needed tenths I use a bore gage.

  4. ambush27 says:

    Wow, I can only really imagine these being used in production or where clearances must be measured to less than one thousandth of a inch. I think for most people bore gauges, telescoping gauges, small hole gauges and inside micrometres are all more economical options.

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