If your guitar feels inconsistent, won’t stay in tune, or lacks clarity—this is one of the most overlooked upgrades that fixes all three.

The Graph Tech TUSQ PT-6643-00 is a precision-engineered replacement nut designed to improve tone, sustain, and tuning stability on both electric and acoustic guitars.

Unlike standard plastic nuts, TUSQ is designed to transfer vibration more efficiently—bringing out more harmonics, better note definition, and a more balanced response across all strings.

Pre-slotted for faster installation, this nut is ideal for upgrades, repairs, or dialing in performance on a wide range of guitars.

What you’ll notice:

• Improved tuning stability
• Better sustain and resonance
• Clearer, more consistent tone
• Smoother string movement

Specifications

• Model: PT-6643-00
• Material Options: TUSQ / TUSQ XL / Black TUSQ XL
• Radius: 15” (R-15)

Dimensions:

• Length: 1.689” (42.9mm)
• Thickness: 0.234” (5.95mm)
• Height: 0.313” (7.95mm)
• String Spacing: 1.387” (35.25mm)

Fitment (Reduce Returns = Protect Margin)

• Fits many electric and acoustic guitars
• Pre-slotted for convenience, but may require minor adjustment for optimal performance
• Always verify dimensions before install

Condition

New