TonePros TP7 7-String Metric Locking Tune-O-Matic Bridge — Black (TP7-B)

The TonePros TP7 (TP7-B) is a 7-string tune-o-matic bridge with the TonePros locking system — the mechanism that locks the bridge posts and thumbwheels in position to eliminate movement and maximise resonance transfer between the bridge and the guitar body. Designed specifically for 7-string guitars, the TP7 features 8mm x 1.25 metric threads, 84.5mm post-to-post spacing, approximately 10.4mm string spread across seven strings, a 14-inch radius, Zmac bridge body and saddles, brass posts and thumbwheels, and pre-notched saddles. The metric thread specification is the most critical purchasing decision on this product — the TP7 is designed for imported 7-string guitars with metric hardware. Before ordering, confirm your guitar's existing post thread is metric (8mm) and that the 84.5mm post spacing matches your instrument's existing post holes. If your guitar has imperial threads, the TP7 will not fit.

Metric vs Imperial Thread — Confirming Compatibility Before You Order

TonePros Locking System — What It Does and Why It Matters

The TonePros locking system is the defining feature of the TP7 and the reason players choose TonePros hardware over standard tune-o-matic alternatives. Understanding how it works explains the tonal and practical benefits:

How a standard tune-o-matic bridge sits on the guitar:
A standard bridge rests on two threaded posts — it is held in position by string tension alone. Under playing load the bridge can rock microscopically on its posts. During string changes it can shift. Over time the post-to-body contact point changes. The result is inconsistent resonance transfer, variable sustain and a bridge that requires periodic re-levelling.

How the TonePros locking system works:
The TP7's posts and thumbwheels feature set screws that lock them mechanically in position once the correct height is established. The bridge cannot rock, shift or move — it is fixed at a set point that maintains constant, consistent contact with the guitar body surface. String changes do not disturb the bridge position. Playing load does not affect the bridge height.

The practical result:

• Improved sustain: Consistent bridge-to-body contact improves resonance transfer — vibration from the strings travels more efficiently into the body rather than being absorbed by a rocking bridge
• More stable tuning: A bridge that cannot shift maintains intonation and string height more consistently across a full performance
• Easier maintenance: Set the height and intonation once, lock it, and the bridge stays at that setting — string changes do not require re-checking bridge height
• Consistent feel: Players who are sensitive to small changes in action will notice that the TP7 maintains a more consistent feel across all strings over time

7-String Specific Design — Post Spacing and String Spread

The TP7 is not a modified 6-string bridge — it is engineered specifically for 7-string instruments. The critical dimensions that make it 7-string specific:

• Post-to-post spacing: 84.5mm (3.32") — the distance between the two bridge posts. This must match your guitar's existing post hole spacing exactly. The standard 6-string post spacing is narrower — a 6-string bridge will not correctly span the posts on a 7-string instrument
• String spread: approximately 10.4mm — the spacing between each of the seven strings across the bridge saddles. This is calibrated for the wider neck profile and string layout of 7-string instruments
• Pre-notched saddles: The saddles are pre-notched for correct 7-string spacing — no additional filing or setup work required to achieve correct string placement

Before ordering, measure your guitar's post-to-post spacing (centre to centre of the two existing post holes) and confirm it measures 84.5mm. If your instrument uses a different post spacing, the TP7 will not align with existing holes.

Zmac Material — TonePros Bridge and Saddle Specification

TonePros uses Zmac — their proprietary zinc alloy formulation — for both the TP7 bridge body and saddles. Zmac is specifically formulated for resonance transmission in guitar hardware applications, providing a consistent and controlled acoustic character that TonePros has optimised across their bridge range.

The post and thumbwheel material is brass — chosen for its mass, its thread engagement characteristics and the warmth it adds to the overall tonal profile of the hardware. Brass thumbwheels and posts have been a consistent specification on quality tune-o-matic hardware for decades for these reasons.

14-Inch Radius

The TP7's 14-inch radius matches the fingerboard radius of most modern imported 7-string guitars — Ibanez RG and S series 7-strings, Schecter 7-string models, ESP/LTD 7-string instruments and similar. The saddle radius matches the fingerboard radius to maintain consistent action across all seven strings from low to high. Fitting a bridge with a mismatched radius results in uneven action — strings in the middle sitting higher or lower than strings at the edges. Confirm your guitar's fingerboard radius before ordering if you are unsure whether 14 inches is correct for your instrument.

Post Cap and Thread Specifications

The TP7 uses a metric flathead post top with a 6mm (0.23") post cap width. The flathead post top is the correct format for the metric insert style used on imported instruments — the flat top seats correctly in the thumbwheel and allows precise height adjustment without the post rotating independently of the thumbwheel once locked.

Finish Selection — All Four TP7 Variants

The TP7 is available in four finishes — all identical in specification, different in finish only:

• Black (TP7-B — this product): Black hardware instruments — Ibanez, Schecter, ESP/LTD and similar 7-strings with black hardware specification
• Nickel (TP7-N): Nickel hardware instruments
• Chrome (TP7-C): Chrome hardware instruments
• Gold (TP7-G): Gold hardware instruments

Match the finish to your guitar's existing bridge posts, tailpiece and hardware throughout for consistent hardware appearance.

6-String Equivalent — T3BT

Players with a 6-string instrument looking for the metric equivalent of the TP7 should look at the T3BT range — the 6-string metric locking tune-o-matic with the same TonePros locking system, Zmac construction and pre-notched saddles in 6-string post spacing. Available in black (T3BT-B), nickel, chrome and gold at Angkor Music.

Who Is the TonePros TP7-B For?

• 7-string guitar players upgrading from a standard non-locking tune-o-matic bridge on an imported 7-string instrument with metric hardware
• Ibanez RG7, S7, Schecter 7-string, ESP/LTD 7-string and similar players with black hardware wanting improved sustain and tuning stability from a locking bridge
• Players who have experienced bridge shift, rocking or inconsistent action on a standard 7-string tune-o-matic bridge
• Players setting up a 7-string for live performance who need a bridge that stays put across a full set without adjustment
• Players who have confirmed their guitar uses metric 8mm x 1.25 posts and 84.5mm post spacing before ordering
• Players with chrome hardware should choose TP7-C — nickel hardware TP7-N — gold hardware TP7-G

Specifications

Expert Advice at Angkor Music

At Angkor Music Melbourne we stock the full TonePros range — TP7 in all four finishes, T3BT 6-string metric equivalent, AVR2 vintage ABR-1 locking bridge, and TonePros tailpieces. Hardware compatibility on tune-o-matic bridges depends on thread type, post spacing and radius — all three need to match your instrument before ordering. Contact us with your guitar's make, model and year if you want compatibility confirmed before purchasing. Professional installation is available through our guitar technician.

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