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GRAPH TECH GUITAR LABS Guitar Top Nut (PT-6643-00)

Free shipping on orders over $29.99

$13.95

$ 5 .99 $5.99

In Stock

1.Style:Single


About this item

  • GraphTech Black TUSQ XL Guitar Nut
  • Graphtech Black Tusq Nut 6 String Electric 43 X 6
  • Designed to boost guitar performance, TUSQ XL is precision engineered and specially formulated to bring out the hidden harmonics and richness in every note.
  • TUSQ XL is based on the highly resonant TUSQ man made ivory and impregnated with PTFE, the slipperiest substance on earth, to improve the tuning performance of the guitar.
  • Improved tuning stability, improved harmonic content


graphtech black tusq nut 6 string electric 43 x 6


Christopher R
2025-09-03 10:11:24
Perfect fit*(see update below) for PRS Tremonti SE and a set of 10 - 46 strings. SE's come with 9 - 42s, and while they are fun to play, the increased sustain with the thicker gauge is evident from the first strum. A great upgrade to get rid of that sharp edged, cheap looking white plastic nut that has no reason being on such an otherwise outstanding guitar. The nut swap is an easy-enough project, and the perfect time to refinish your fret-board with some #0000 steel wool and 100% mineral oil (don't forget to tape off your PUP's - as these magnets are, well a magnet, for all those steel shavings). I recommend watching a vid on the nut replacement, carefully score the finish around the old nut, and the old one comes off easy enough with the tap of a mallet. Use a little wood glue, and a Capo to clamp it in place for 24 hours to dry, yes, I know you're going to want to string it and play after like 15 minutes, but it will likely fall out every time you replace the strings unless you actually form a chemical bond. Otherwise, the alignment is 100% flush with both wide-thin & wide-fat necks, and string slotting are both superior to the OEM nut. Never had an issue holding tuning with the stop-tail Tremonti previously (had to use pencil graphite on the nut as a lubricant), and it's rock solid (and additive-free) after the change as well. Intonation changed slightly with the 10 - 46s, requiring a slight adjustment at the bridge. This can be problematic on a stop-tail bridge -- with the PRS, tightening the hex screws actually lengthens the scale length which is counter-intuitive. The bridge will slide right out w/o string tension holding it down, take a look at it to see how this works. There are no individual adjustments, supposedly if you intonate the high-E at the 12th, followed by the low-E, the other strings intonation magically fall in place. Actually, it works pretty well for the middle strings, but can be difficult to get both E's near perfect at the same time w/o a high-quality solid scope. No truss rod adjustment was (or should be) necessary moving from 9s to 10s.*Update 8/27/16 I did get a professional set-up a few weeks after installing this nut. The intonation issue was pre-existing, and virtually the same problem translated with the TUSQ nut out-of-the-box. Intonation around the lower frets (closest to the nut had always been off - and improved as I went up the neck). This is a slotting issue and relevant to having a proper set-up, so I can no longer say it's a perfect fit. The 9s the guitar came with were replaced pretty quickly w/10's, so I cannot for certain say if this was a string gauge issue. Since I did not have the proper tools and gauges to do this myself, I had a skilled luthier go over the guitar, and it increased playability with numerous slight adjustments. At around $35 highly recommended. The intonation is very good and barring chords close to the nut requires less effort if your tolerances are tight (too far and you'll get fret buzz). Still a 5-star nut for price/performance just believe most people can benefit from having it properly slotted.
Alija
2025-08-30 14:53:16
My 2018 made in Korea PRS se custom 22 with awesome sunburst flame top and f hole was having tuning issues on the g and b strings. I tried graphite powder and filing the nut slots for .010-046 strings.This helped but only for a short while, so i scored around the nut and it popped off easily enough. The new black graptech tusq xl was a perfect fit with no modifications needed. Just set it in with a few drops of white glue and restring and tune it up and the guitar was good to go. No more tuning issues. Thanx alot Graphtech for a great product.
charles_atx
2025-08-26 13:10:43
I'm not a guitar tech, but I'm pretty handy and tend to jump into things without reading the instructions.I first measured the string height on the low and high e with micro calipers.I loosened my strings until they could be moved off to the side, I removed the original nut from my pre ce by scribing around it on all sides with a razor then tapping it with a metal punch and a hammer, up from the fingerboard side. It came off clean.I then put the new nut in place and put the strings back on and tuned it up then measured the height. It was a little high, so I loosened the strings back down, and sanded the bottom of the nut held at an intentional angle to take a little more off one side than the other on some 400grit sandpaper on a table top. Repeated this a couple times until it all lined up. Left it unglued for a few days while I adjusted string height at the bridge and intonation until I was happy, then loosened it back up, add a drop of wood glue to the nut and spread it thin with my finger, then reassembled. Worked like a champ, plays great, and solved a problem I was having with the stock nut pinching the b string and causing a dull tone and poor sustain when unfretted. I didn't have to file the string grooves. I'm very happy.
Customer
2025-08-06 15:45:28
This is the right size for a PRS se custom 24. I use 52-10 strings so had to sand the top slots to fit the strings and sand the bottom to get the action right. This was a huge improvement to the tuning stability over the stock nut, 100% would recommend.
Harry Jones
2025-08-01 14:33:23
The string spacing wasn't exactly like the PRS SE Custom 24 I purchased it for, but the nut was made well. The material was good and it was easy to finish filing.
Yancy G.
2025-07-29 13:41:37
Nut sounds and looked good I had to sand almost a business card thicknesses the bottom of it I didn't want to file the grooves it might have mess up tone now my bc rich warlock guitar sounds clear as a bell
Enrique
2025-07-03 14:07:52
Perfect for upgrading the plastic nut of my PRS SE custom 24. Great to keep intonation while using the vibrato bar. Recommend getting a luthier to installing since they will sand it and adjust the height, but you can do it yourself carefully.
Mark C
2025-06-23 13:48:39
Installed this on my 2018 PRS SE Custom and completely resolved the G/B string tuning issues using 10-46 strings. Tuning stays rock solid through bends and trem use. The SE line comes from the factory with 9-42 strings and that is the only gauge of strings the plastic factory nut will accept without widening the slots, else you will have tuning issues due to binding. So if you are using strings heavier than 9-42 on a PRS SE with the factory nut and are having tuning issues, this is the solution or at least it was for me. Super easy to install although it did require a slight bit of sanding/scraping on the headstock where it meets the nut to remove a small amount of lacquer buildup that was preventing the TUSQ XL nut from sitting flat on the headstock wood (YMMV). No sanding on the TUSQ itself was required for me, height was perfect. There was also a noticeable difference in sustain after the installation was complete. Fantastic product, I'll never own another guitar without installing one of these!
Customer
2025-06-13 14:35:48
Nice upgrade for such a low price. Used this for an Ibanez SA260FM. The string spacing on the stock nut was less than on this one. However it still fits nicely and I actually prefer the extra string spacing. Awesome!
Mick Johnson
2025-06-11 16:13:00
The nut is brilliant. Improved tuning stability is noticeable, and tone and sustain is also improved. However these are too short for a PRS, there is a slight gap at the edge and can be felt when running your finger over it. Also the E to e spacing is too short. I have now ordered a Gibson nut, quoted as slightly longer and with the correct string spacing.
Per-Olav Ålkärr
2025-06-09 17:40:12
Passade direkt utan några större justeringar på min PRS SE DGT.Bredd och längd stämmer precis. Däremot så kan man behöva justera höjden något för att få rätt stränghöjd vid första bandet.
luke
2025-06-02 18:50:27
Authentic graphteck .About half a millimetre short on each end for a Indonesian PRS se .But barely noticeable .Be sure to patiently, file with nut file each slot in a V shape and to the radius of your neck.YouTube has good tutorials on replacing nuts.Watch a few to fully understand process always file less than you need to . When almost there I then file bottom of nut flat while checking intonation to get guitar PERFECTLY in tune with itself.
Javier Roldán
2025-05-23 12:27:00
Había probado de todo durante casi dos años con mi PRS SE Custom 24 incluyendo el llevarlo a un luthier o bloquear el tremolo, sin embargo nada parecía ayudar en que la afinación se mantuviese durante más de un un par de horas seguidas (y sin usar el tremolo para nada). Llegué a la conclusión de que el problema tenía que estar en la Cejuela, así que compré esta y tras cambiarla y acomodarse las cuerdas mantiene la afinación durante días.
Christopher R
2025-05-08 12:04:21
Perfect fit*(see update below) for PRS Tremonti SE and a set of 10 - 46 strings. SE's come with 9 - 42s, and while they are fun to play, the increased sustain with the thicker gauge is evident from the first strum. A great upgrade to get rid of that sharp edged, cheap looking white plastic nut that has no reason being on such an otherwise outstanding guitar. The nut swap is an easy-enough project, and the perfect time to refinish your fret-board with some #0000 steel wool and 100% mineral oil (don't forget to tape off your PUP's - as these magnets are, well a magnet, for all those steel shavings). I recommend watching a vid on the nut replacement, carefully score the finish around the old nut, and the old one comes off easy enough with the tap of a mallet. Use a little wood glue, and a Capo to clamp it in place for 24 hours to dry, yes, I know you're going to want to string it and play after like 15 minutes, but it will likely fall out every time you replace the strings unless you actually form a chemical bond. Otherwise, the alignment is 100% flush with both wide-thin & wide-fat necks, and string slotting are both superior to the OEM nut. Never had an issue holding tuning with the stop-tail Tremonti previously (had to use pencil graphite on the nut as a lubricant), and it's rock solid (and additive-free) after the change as well. Intonation changed slightly with the 10 - 46s, requiring a slight adjustment at the bridge. This can be problematic on a stop-tail bridge -- with the PRS, tightening the hex screws actually lengthens the scale length which is counter-intuitive. The bridge will slide right out w/o string tension holding it down, take a look at it to see how this works. There are no individual adjustments, supposedly if you intonate the high-E at the 12th, followed by the low-E, the other strings intonation magically fall in place. Actually, it works pretty well for the middle strings, but can be difficult to get both E's near perfect at the same time w/o a high-quality solid scope. No truss rod adjustment was (or should be) necessary moving from 9s to 10s.*Update 8/27/16 I did get a professional set-up a few weeks after installing this nut. The intonation issue was pre-existing, and virtually the same problem translated with the TUSQ nut out-of-the-box. Intonation around the lower frets (closest to the nut had always been off - and improved as I went up the neck). This is a slotting issue and relevant to having a proper set-up, so I can no longer say it's a perfect fit. The 9s the guitar came with were replaced pretty quickly w/10's, so I cannot for certain say if this was a string gauge issue. Since I did not have the proper tools and gauges to do this myself, I had a skilled luthier go over the guitar, and it increased playability with numerous slight adjustments. At around $35 highly recommended. The intonation is very good and barring chords close to the nut requires less effort if your tolerances are tight (too far and you'll get fret buzz). Still a 5-star nut for price/performance just believe most people can benefit from having it properly slotted.
Alija
2025-04-18 11:11:50
My 2018 made in Korea PRS se custom 22 with awesome sunburst flame top and f hole was having tuning issues on the g and b strings. I tried graphite powder and filing the nut slots for .010-046 strings.This helped but only for a short while, so i scored around the nut and it popped off easily enough. The new black graptech tusq xl was a perfect fit with no modifications needed. Just set it in with a few drops of white glue and restring and tune it up and the guitar was good to go. No more tuning issues. Thanx alot Graphtech for a great product.
charles_atx
2025-04-08 13:16:58
I'm not a guitar tech, but I'm pretty handy and tend to jump into things without reading the instructions.I first measured the string height on the low and high e with micro calipers.I loosened my strings until they could be moved off to the side, I removed the original nut from my pre ce by scribing around it on all sides with a razor then tapping it with a metal punch and a hammer, up from the fingerboard side. It came off clean.I then put the new nut in place and put the strings back on and tuned it up then measured the height. It was a little high, so I loosened the strings back down, and sanded the bottom of the nut held at an intentional angle to take a little more off one side than the other on some 400grit sandpaper on a table top. Repeated this a couple times until it all lined up. Left it unglued for a few days while I adjusted string height at the bridge and intonation until I was happy, then loosened it back up, add a drop of wood glue to the nut and spread it thin with my finger, then reassembled. Worked like a champ, plays great, and solved a problem I was having with the stock nut pinching the b string and causing a dull tone and poor sustain when unfretted. I didn't have to file the string grooves. I'm very happy.
Customer
2025-04-05 18:51:52
This is the right size for a PRS se custom 24. I use 52-10 strings so had to sand the top slots to fit the strings and sand the bottom to get the action right. This was a huge improvement to the tuning stability over the stock nut, 100% would recommend.
Harry Jones
2025-04-03 10:40:58
The string spacing wasn't exactly like the PRS SE Custom 24 I purchased it for, but the nut was made well. The material was good and it was easy to finish filing.
Yancy G.
2025-03-08 10:45:38
Nut sounds and looked good I had to sand almost a business card thicknesses the bottom of it I didn't want to file the grooves it might have mess up tone now my bc rich warlock guitar sounds clear as a bell
Enrique
2025-02-26 11:30:40
Perfect for upgrading the plastic nut of my PRS SE custom 24. Great to keep intonation while using the vibrato bar. Recommend getting a luthier to installing since they will sand it and adjust the height, but you can do it yourself carefully.
Mark C
2025-01-30 12:45:38
Installed this on my 2018 PRS SE Custom and completely resolved the G/B string tuning issues using 10-46 strings. Tuning stays rock solid through bends and trem use. The SE line comes from the factory with 9-42 strings and that is the only gauge of strings the plastic factory nut will accept without widening the slots, else you will have tuning issues due to binding. So if you are using strings heavier than 9-42 on a PRS SE with the factory nut and are having tuning issues, this is the solution or at least it was for me. Super easy to install although it did require a slight bit of sanding/scraping on the headstock where it meets the nut to remove a small amount of lacquer buildup that was preventing the TUSQ XL nut from sitting flat on the headstock wood (YMMV). No sanding on the TUSQ itself was required for me, height was perfect. There was also a noticeable difference in sustain after the installation was complete. Fantastic product, I'll never own another guitar without installing one of these!
Customer
2025-01-24 10:10:58
Nice upgrade for such a low price. Used this for an Ibanez SA260FM. The string spacing on the stock nut was less than on this one. However it still fits nicely and I actually prefer the extra string spacing. Awesome!
Mick Johnson
2025-01-21 10:31:42
The nut is brilliant. Improved tuning stability is noticeable, and tone and sustain is also improved. However these are too short for a PRS, there is a slight gap at the edge and can be felt when running your finger over it. Also the E to e spacing is too short. I have now ordered a Gibson nut, quoted as slightly longer and with the correct string spacing.
Per-Olav Ålkärr
2025-01-16 19:32:47
Passade direkt utan några större justeringar på min PRS SE DGT.Bredd och längd stämmer precis. Däremot så kan man behöva justera höjden något för att få rätt stränghöjd vid första bandet.
luke
2025-01-10 17:35:20
Authentic graphteck .About half a millimetre short on each end for a Indonesian PRS se .But barely noticeable .Be sure to patiently, file with nut file each slot in a V shape and to the radius of your neck.YouTube has good tutorials on replacing nuts.Watch a few to fully understand process always file less than you need to . When almost there I then file bottom of nut flat while checking intonation to get guitar PERFECTLY in tune with itself.
Javier Roldán
2024-12-14 10:24:26
Había probado de todo durante casi dos años con mi PRS SE Custom 24 incluyendo el llevarlo a un luthier o bloquear el tremolo, sin embargo nada parecía ayudar en que la afinación se mantuviese durante más de un un par de horas seguidas (y sin usar el tremolo para nada). Llegué a la conclusión de que el problema tenía que estar en la Cejuela, así que compré esta y tras cambiarla y acomodarse las cuerdas mantiene la afinación durante días.