Jacobs 18N Ball Brg Super Chuck
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  1. #1
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    Default Jacobs 18N Ball Brg Super Chuck

    As shown - 1 broken jaw
    MT4 arbor is pitted but hooks up good in a taper.
    Opens and closes easily.

    $65 shipped

    img_2970.jpgimg_2971.jpgimg_2973.jpgimg_2972.jpg

  2. #2
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    I hate to rain on your parade, but the odds of finding repair kit for the chuck are slim. Last time I looked, none were available. I wound up regrinding the old jaws.

    Tom

  3. #3
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    I figure someone out there has an 18N kit on the shelf, or a bad chuck with a good jaw or two.
    There have been jaw sets on ebay for small money, though none right now.,

  4. #4
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    The 'New Style' super Chuck takes service kit #30347 and this will be stamped on the nose of the chuck.
    If this service kit number is not present then this is the 'Old Style' chuck with a filling slot for the ball bearings.
    The service kit for the old style is #07434 aka U18N and is never stamped on the chuck nose.
    When a chuck is dropped onto an unyielding surface damage occurs most often to the threaded split nut shearing the threads for one jaw.
    John

  5. #5
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    Last "bargain" NOS kit on Ebay sold for $90+

    I just sold my 18n on here a couple weeks ago. Looked just like yours. It sat a few weeks with no offers. I finally ended up accepting an offer of $15 plus shipping.
    Shortly after that the aforementioned kit on ebay sold.

    I like to think my buyer from New York scored the kit, and was able to end up with a rebuilt 18N for under $140.

    Steve.

    Sent from my SM-J737P using Tapatalk

  6. #6
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    The jaws from a newer repair kit (not Chinese) will work on a old chuck. The split nut will not work on a old chuck. I've ran into this a few years back. Ken

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  8. #7
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    I just got a chuck key from McMaster and it came from LFA USA. They threw a business card in the bag and I checked out their website. They sell rebuild kits (as well as whole chucks) for the Jacobs Super Chucks:

    Super Chucks


    No prices so you will have to contact them.

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  10. #8
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    Excellent information.

    Tom

  11. #9
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    Looks like McMaster might sell those kits:

    McMaster-Carr

  12. #10
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    Chuck is sold,.
    Thanks for the input guys!


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