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Model 6643-00 Nut Slotted L42.95mm (Select Material)

Model 6643-00 Nut Slotted L42.95mm (Select Material)



Regular price $15.02 USD
Regular price Sale price $15.02 USD
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Select Material

The 6643-00 is the perfect option to replace and upgrade the nut on your acoustic or electric guitar.

It is pre-slotted to make for a quick and easy install.


The PQ-6643-00 is also available in a convenient 10-pack (LQ-6643-10)

Measure Length Width Height Str.Sp
inches 1.691” 0.235” 0.313” 1.387”
mm 42.95 5.98 7.95 35.22


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What is the Difference in TUSQ Materials?


TUSQ nuts have a rich tone without the inconsistency found in ivory, bone, and other natural materials. Bone and ivory have hard and soft spots (grain) throughout each piece, hampering the consistent transfer of vibrations to the guitar top. TUSQ nuts are designed to transfer the right frequencies more efficiently from the string to the guitar body.

Best for Acoustic Guitars.


TUSQ XL and Black TUSQ XL nuts are designed to boost guitar tone and performance. These precision-engineered nuts are made with a specially formulated material that couples the strings' vibrations to the neck and brings out the hidden harmonics and richness in every note. It is based on the highly resonant TUSQ man-made ivory but is impregnated with PTFE to improve the tuning performance of the guitar.

Best for Electric Guitars and BASS.

Rated 4.9 out of 5 stars
Based on 26 reviews
Total 5 star reviews: 24 Total 4 star reviews: 2 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
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26 reviews
  • RB
    Ray B.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    PRS Piezo 2 Nut Replacement

    I recently installed the Model 6643-00 Nut Slotted L42.95mm Tusq Nut on my PRS Piezo 2 guitar.

    Even when winding on a new set of strings, starting from the E 6th and up, my ears instantly picked up on a new-found overall resonance on the guitar due to the new nut installation. I highly recommend Graph Tech products, they are always of the highest quality. I now have Tusq Nuts on 4 of my guitars, the next to receive one of these nuts will be my Epiphone ES 339. Thanks Guys!

    Ray Burton

    Internationally Acclaimed Singer/Songwriter

    The Man who wrote “I AM WOMAN” for/with Helen Reddy

    Lifetime Honorary Member of the International Songwriters Association

    Artist / Representative @ Steinberg / Yamaha Australia

  • CM
    Clay M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    4 months ago
    Prs replacement graphtech nut.

    I have graphtech nuts on my guitars, they give a great tone. Minimal effort to install. The best upgrade to start with to improve the tuning stability and tone.

    I also have the Ratio tuners which are also a great upgrade.

    Thank you,

    Clay Morrison

  • MP Profile picture for Mike logo
    Mike P.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    4 months ago
    Best upgrade ever

    I got this for a Jackson JS Series Dinky Ziricote JS42 DKM HT. I loved how the guitar played, felt and sounded but it would not stay in tune. For a hard tail guitar there should be nothing that would make it go out of tune so much, even with less aggressive playing, but it came with that cheap plastic nut and would require adjustments all the time. I spent a lot of time trying to get it intonated as well and it just didn’t sound in tune at different positions. The GraphTech nut was the magic elixir that fixed all of that. The old nut popped off with minimal effort and the GraphTech fit exactly with no modifications*. It sounds and plays like a new instrument now with even lower action and stays in tune perfectly, and the intonation issues are also gone. If you have a Jackson with a plastic nut you absolutely need one of these. It is truly a night and day difference.

    *Only some minimal filing to angle the slots on the higher strings was needed due to the sharp angle of the pointy headstock.

  • SK
    Stephen K.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    4 months ago
    Excellent selection

    Fit my guitar just right and now it tunes much easier with the new nut.

  • OP
    Ophelia P.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    6 months ago
    nut review

    Don't know yet, going to have installed by a pro

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