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Model M644-00 Nut Slotted Slanted Bottom L44.32mm (Select Material)

Model M644-00 Nut Slotted Slanted Bottom L44.32mm (Select Material)



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

The M644-00 is the perfect option to replace and upgrade the nut on your Martin-style acoustic guitar and other guitars that require angled nuts.

It has an angled bottom and comes pre-slotted to make for a quick and easy install.

Measure Length Thickness Height Str.Sp
inches 1.745” 0.224” 0.361” 1.418”
mm 44.32 5.69 9.17 36.02


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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 permanently lubricated to improve the tuning performance of the guitar.

Best for Electric Guitars and BASS.

Rated 4.5 out of 5 stars
Based on 2 reviews
Total 5 star reviews: 1 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
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2 reviews
  • TG
    Tristan G.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago

    New nut and saddle + some folk nylon strings brought some new life to a beat up ~70 year old Wards (Harmony) parlour guitar with terrible action and wouldn’t stay in tune more than one song . Now it’s one of my favourites to just grab and play effortlessly!

  • EJ
    Erik J. T.
    Verified Buyer
    I recommend this product
    Rated 4 out of 5 stars
    1 year ago
    Not a great fit for Martin dreadnaught guitars

    The radius of the precut slots are not a match for my Martin D-18. When sizing the nut, when I got the clearance perfect on low and high E strings above the first fret, the rest of the strings are too high, especially D and G strings. I can't go any lower on the nut without getting buzz on the E strings so I will need to buy tools to cut down the grooves so the radius of the precut slots in the nut matches the radius of the guitar neck. Perhaps most modern acoustic guitars have more curvature on the fretboard.

    Also, the slots are just slightly too close together--I carefully measured and looked for a nut on your site that was closer to what I had before, but could not find a closer match. This one is close, but compared to my other Martin D-18, the playability, especially in first position is just not as good. Guess I need to learn to cut my own nut from a blank next time. There isn't a luthier anywhere within hours of me that I trust to create the nut and set up this guitar, and I'm quite picky about playability as a pro and was so hopeful graphtech would have what I needed but I guess most Martin acoustic players don't buy graphtech nuts.

    However, when I bend strings, they do return to proper tuning better than with my old bone nut, so the XL self lubricating feature works as advertised.

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