Graph Tech expands its clamp-free Un-Lock Nut system to 7-string guitars
Two Black TUSQ XL models bring full-time machine-head access and faster string changes to 7-string instruments with double-locking tremolos.
Sep 30, 2026
Credit: Premier Guitar
Graph Tech has extended its Un-Lock Nut range with two pre-slotted models for 7-string electric guitars. The replacements swap a conventional metal locking nut and clamps for triple-lubricated Black TUSQ XL, keeping the machine heads available for ordinary tuning changes while a double-locking bridge handles the tremolo end.
The two versions cover 12-inch Floyd-style and 16-inch Ibanez-style radii. Graph Tech says the extended slot ramps distribute string stress more evenly, individual string heights remain adjustable during fitting, and installation does not require permanent modification. Both models are available now at $24.95 each.
Credit: YouTube
Why it matters
Alternate tunings and emergency string changes are awkward on a clamped 7-string. These models carry Graph Tech’s simpler nut concept into the extended-range market without asking players to abandon a double-locking bridge.
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