By PickSmartly Editorial Team
· Updated Aug 4, 2026
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Upgrading or maintaining a bass guitar requires precision, and nowhere is precision more vital than at the headstock. Tuning machines, or tuners, are the gatekeepers of your instrument's pitch stability. When looking specifically at Metallor hardware, you are stepping into a world of professional-grade engineering known for its durability and smooth mechanical engagement. Whether you are restoring a vintage instrument or upgrading a budget bass to professional standards, choosing the right set of keys is a decision that impacts both the playability and the long-term tuning stability of your bass.
Editor's Choice
Our Top Picks for Metallor Bass Guitar Tuning Machines
The three standouts our editors recommend first — ranked by performance, value, and real-world reviews.
Set of 6 quality sealed black machine heads(3L+3R), fit 10mm(0.39inch) standard machine head hole.
Heavy duty internal gear tested, easy to install, compatible with steel string electric guitar or acoustic guitar.
Gear ratio: 1:14. Zinc alloy material with black plating；Location: 3L 3R. Head size is 22mm width. For specific dimensions, please look at the size diagram.
Metallor sealed tuning pegs offer a surprisingly robust upgrade for any guitarist looking to stabilize their instrument's pitch without breaking the bank. These black-plated zinc alloy tuners feature a 1:14 gear ratio that feels smooth and responsive during fine adjustments, making them a reliable choice for both electric and acoustic steel-string setups. The 3L+3R configuration fits standard 10mm holes perfectly, and the heavy-duty internal gears are built to withstand the constant tension of string changes. I was particularly impressed by the completeness of the kit. Having the ferrules, screws, and threaded bushings included means you can move straight to installation. While they are an entry-level replacement, the build quality provides a level of tuning stability that is hard to find at this price point.
Metallor Bass Tuning Machines Tuning Pegs Tuning Keys Machine Heads Tuners Vintage Open Gear 2 Left 2 Right for P Bass J Bass Guitar Parts Replacement...
Heavy duty internal gear, Economy open gear bass tuning keys set for Precision Bass or Jazz Bass.
Fits for 13.5mm(0.53in) peg hole, the bushing inner diameter is 18.2(0.72)mm, outside diameter 19mm(0.75in), peg length is 30mm(1.18in). for specific dimensions, please look at the size diagram.
Zinc alloy material, Gear Ratio: 1:22. Color: Black
Includes 2pcs right and 2pcs left open frame bass tuners. Mounting screws, ferrules and threaded bushings are included.
Great replacement for the old, broken tuning pegs. Essential accessory of a bass, perfect for you!
You might hesitate to swap out your existing hardware for a budget-friendly set, but these Metallor tuning machines prove that vintage aesthetics don't have to break the bank. Designed specifically for Precision and Jazz Bass setups, these open-frame tuners provide a classic look while utilizing a heavy-duty internal gear system. The 1:22 gear ratio offers the stability needed for bass strings, and the zinc alloy construction feels surprisingly substantial for the price point. They arrive as a complete kit with two left and two right tuners, along with all necessary mounting screws, ferrules, and bushings. If you are looking to restore a broken instrument or simply want to upgrade to a sleek black finish, these are a reliable, no-nonsense replacement part.
Heavy duty internal gear, economy sealed bass tuning keys set for Precision Bass or Jazz Bass.
Fits for 15mm peg hole, the bushing inner diameter 18mm, outside diameter 21mm, peg length is 30mm. for specific dimensions, please look at the size diagram.
Budget-conscious bassists looking to restore that classic aesthetic without breaking the bank need these Metallor open-frame machine heads immediately. Replacing worn-out or broken hardware can be a headache, but this four-piece set offers a straightforward solution for Precision or Jazz Bass setups. The zinc alloy construction feels surprisingly sturdy, and the 1:22 gear ratio provides the reliable tension necessary for keeping your low end in check. I particularly like the vintage open-gear look which adds a layer of character to any instrument. Since they come complete with mounting screws, ferrules, and threaded bushings, you have everything required for a clean installation on a standard 15mm peg hole. It is a practical, heavy-duty upgrade that brings both functionality and old-school style back to your rig.
Metallor’s sealed tuning pegs represent a budget-friendly lifeline for bassists looking to breathe new life into aging Precision or Jazz bass setups. These machine heads utilize a robust zinc alloy construction and a 1:22 gear ratio, providing the steady, heavy-duty internal gearing necessary for maintaining pitch during intense playing sessions. The black finish offers a sleek, professional aesthetic that fits seamlessly into modern instrument designs. Because they come as a complete kit—including mounting screws, ferrules, and threaded bushings—you can skip the headache of hunting for extra hardware. While they are positioned as an economy-tier option, the sealed design offers a reliable defense against debris, making them a smart, practical replacement for worn-out or broken pegs.
Set of 6 quality sealed chrome machine heads(3L+3R) with half moon button, fit 10mm(0.39inch) standard machine head hole.
Heavy duty internal gear tested, easy to install, compatible with steel string electric guitar or acoustic guitar.
Gear ratio: 1:14. Zinc alloy material with chrome plating. Location: 3L 3R. Head size is 23.6mm(0.93in) width. For specific dimensions, please look at the size diagram.
Package includes: 3 left and 3 right hand guitar machine heads. 6 x Ferrules. 6 x Screws. 6 x Threaded bushings.
Can a budget-friendly hardware upgrade actually stabilize your tuning? These Metallor sealed machine heads offer a surprisingly robust solution for anyone looking to refresh an electric or acoustic guitar without breaking the bank. Built from chrome-plated zinc alloy, the set features a 1:14 gear ratio that feels smooth and dependable during adjustments. The half-moon buttons provide a comfortable grip, and the heavy-duty internal gears are designed to handle the tension of steel strings with ease. Since they fit standard 10mm holes, the installation process is straightforward, especially with the included ferrules, screws, and threaded bushings. It is a complete, ready-to-install kit that delivers functional reliability for both hobbyists and players needing a quick, cost-effective replacement set.
These are sealed locking tuners (machine heads) for 3 Left 3 Right handed electric guitar or acoustic guitar. Fits for modern standard 10mm (0.39inch) standard peg holes.
Heavy duty internal gear tested, easy to install, it can hold strings tightly, allowing the guitar to stay in tune to improve playing enjoyment, compatible with steel string electric guitar or folk acoustic guitar.
They are a 1:18 gear ratio for smooth turning. Locking tuners are in our experience great for providing maximum tuning stability.
Zinc alloy material with chrome plating. Location: 3 Left and 3 Right. Head size is 18.6mm(0.73in) width. For specific dimensions, please look at the size diagram.
Package includes: 3 x Right guitar machine heads. 3 x Left guitar machine heads. 6 x Ferrules. 6 x Screws. 6 x Threaded bushings.100% brand new and testing is fine.
The smooth, mechanical click of the internal gears provides immediate confidence the moment you start winding your strings. These Metallor locking tuners are a budget-friendly upgrade for anyone struggling with tuning stability on an electric or folk acoustic guitar. Built from zinc alloy with a polished chrome finish, the 1:18 gear ratio ensures that every micro-adjustment feels precise rather than jumpy. Because they are sealed locking machines, they grip the strings tightly to prevent slipping, which is a massive relief during aggressive playing sessions. The set comes complete with all necessary hardware, including ferrules, screws, and bushings, making the installation into standard 10mm peg holes straightforward for most players looking to stabilize their instrument.
Metallor Sealed Guitar String Tuning Pegs Grover Machines Heads Tuning Keys Tuners 6 In Line Right Handed Electric Guitar Acoustic Guitar Parts Replac...
Set of 6 quality sealed chrome right handed machine heads with keystone button, fit 10mm(0.39inch) standard machine head hole.
Heavy duty internal gear tested, easy to install, compatible with steel string electric guitar or acoustic guitar.
Gear ratio: 1:14. Zinc alloy material with chrome plating. Location: 6R. Head size is 18mm(0.71in) width. For specific dimensions, please look at the size diagram.
Package includes: 6 x Right hand guitar machine heads. 6 x Ferrules. 6 x Screws. 6 x Threaded bushings.
Wobbly, slipping tuning pegs can turn a great practice session into a frustrating struggle with constant retuning. These Metallor sealed machine heads offer a reliable, budget-friendly solution for players looking to upgrade or repair their right-handed electric or acoustic guitars. Built with a zinc alloy and finished in a clean chrome, they feature a 1:14 gear ratio that feels surprisingly sturdy for the price point. The keystone buttons provide a comfortable grip, and the heavy-duty internal gears are designed to handle the tension of steel strings without skipping. Since they fit standard 10mm machine head holes, the installation process is straightforward, especially with the included ferrules, screws, and bushings. It is a solid, functional set for anyone needing a dependable replacement part.
Set of 6 quality sealed gold machine heads(3L+3R) with keystone button, fit 10mm(0.39inch) standard machine head hole.
Heavy duty internal gear tested, easy to install, compatible with steel string electric guitar or acoustic guitar.
Gear ratio: 1:14. Zinc alloy material with gold plating. Location: 3L 3R. Head size is 18mm(0.71in) width. For specific dimensions, please look at the size diagram.
Package includes: 3 left and 3 right hand guitar machine heads. 6 x Ferrules. 6 x Screws. 6 x Threaded bushings.
Metallor’s gold-plated sealed machine heads offer a surprisingly professional upgrade for players looking to revitalize an aging electric or acoustic guitar. These 3L/3R tuners feature a 1:14 gear ratio and heavy-duty internal gearing that provides the stability needed for steel strings. The keystone buttons add a classic aesthetic touch, while the zinc alloy construction feels substantial in hand. Installation is straightforward since they fit a standard 10mm hole, and the kit is impressively complete with all necessary ferrules, screws, and threaded bushings included. While they are a budget-friendly replacement option, the sealed design helps protect the internal mechanics from debris, ensuring your tuning stays consistent during long sessions.
Set of 6pcs quality semiclosed chrome machine heads(3 Left 3 Right), fit for 6mm(0.24inch) tuner hole.
Heavy duty internal gear tested, durable to use, compatible with steel string electric guitar or acoustic guitar.
Gear ratio: 1:14. Zinc alloy material with chrome plating. Location: 3L 3R. Head size is 18mm(0.71inch) width. For specific dimensions, please look at the size diagram.
Package includes: 3L+3R guitar machine heads(semiclosed). 6 x Ferrules. 12 x Screws.
100% brand new and testing is fine. Easy to install, just slip the string though the hole, tighten the locking thumb wheel, and tune the string.
You might hesitate to swap out your existing hardware for a budget-friendly set, but these Metallor semiclosed machine heads offer a surprisingly robust solution for a quick upgrade. I found that the heavy-duty internal gears provide a reliable 1:14 gear ratio, which is essential for maintaining tension on both electric and acoustic steel strings. The zinc alloy construction with a polished chrome finish feels substantial in hand, and the 18mm head width fits standard 6mm tuner holes without a struggle. Installation is straightforward since the kit includes everything you need—six tuners, six ferrules, and twelve screws. It is a practical, no-nonsense replacement set that delivers steady tuning performance without breaking the bank.
A Guide to Selecting the Best metallor bass guitar tuning machines
Understanding Gear Ratio and Precision
The most critical technical specification to evaluate when selecting Metallor tuning machines is the gear ratio. The gear ratio determines how many turns of the tuning key are required to complete one full rotation of the tuning post. For bass guitars, which deal with much higher string tension than electric guitars, a higher gear ratio is generally preferred. A ratio such as 20:1 or higher allows for micro-adjustments, which is essential when you are trying to dial in a perfect pitch on a heavy low-B or E string. A higher ratio means more control and less chance of 'overshooting' your target note, providing a much more stable tuning experience during performance.
Open-Gear vs. Sealed-Gear Systems
Metallor offers various configurations, and your choice often depends on the aesthetic and functional requirements of your bass. Open-gear tuners are frequently favored by vintage enthusiasts and players who prefer a classic, 'old-school' look. They allow you to see the mechanical workings of the machine, which can be visually striking. However, because the gears are exposed, they are more susceptible to dust and debris buildup. Sealed-gear tuners, on the other hand, enclose the mechanism within a housing. This design protects the internal lubrication and gears from environmental factors, making them the superior choice for players who perform in humid climates or high-dust environments. Sealed systems generally offer more consistent long-term performance with less maintenance required.
Mounting Styles and Headstock Compatibility
Before committing to a set of keys, you must verify the mounting style. Metallor produces machines in several different footprints. Some are designed for direct screw-in mounting, while others require specific bushings to fit through the headstock holes. You must consider whether your bass requires 'top-mount' or 'side-mount' configurations. Furthermore, pay close attention to the diameter of the tuning post. If you are replacing existing hardware, the new posts must match the diameter of your current string holes to avoid the need for drilling new holes in your headstock, which can compromise the structural integrity of the wood. Always measure your current tuner footprint and post diameter to ensure a seamless 'drop-in' replacement.
Material Quality and Weight Distribution
The weight of the tuning machines can subtly affect the balance of your bass. While heavier, high-quality metal components often signal better durability and smoother gear engagement, an excessive amount of weight at the headstock can lead to 'neck dive,' where the headstock pulls the instrument downward. Metallor is known for using high-grade alloys that balance strength with manageable weight. Look for machines that feel substantial in the hand but are engineered to maintain the center of gravity of your instrument. High-quality plating—such as chrome, gold, or nickel—is also important not just for looks, but for preventing corrosion over years of heavy use.
Recommendation Logic
When making your final selection, follow this logic: If you are a professional touring musician seeking maximum reliability, prioritize sealed-gear systems with a high gear ratio. If you are a collector or a player focused on aesthetics and vintage accuracy, opt for open-gear configurations. Regardless of style, always prioritize a match in post diameter and mounting footprint to ensure your upgrade process is a simple replacement rather than a complex structural modification.
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Quick answers about Metallor Bass Guitar Tuning Machines before you buy.
Sealed gear tuners are enclosed in a housing to prevent debris from entering, making them more stable and better for maintaining tuning under heavy use. Open-gear tuners offer a vintage aesthetic but are more susceptible to dust and environmental changes.
Yes, switching from lightweight tuners to heavy-duty metal tuners can shift the instrument's center of gravity toward the headstock. Look for high-ratio machines that provide stability without excessive weight.
The gear ratio (e.g., 20:1) indicates how many turns of the tuning key are required for one full rotation of the gear. A higher ratio provides more precision, which is essential for the thick strings used on bass guitars.
If you are replacing existing hardware, most modern tuners are designed to fit standard vintage or modern mounting patterns. However, if the diameter of the shaft or the mounting footprint differs, minor drilling or modification may be required.
High-quality metal tuners should feel smooth without any 'notchy' or grinding sensations when turning. They should also feature robust construction with minimal lateral play or wobbling in the shaft.
Locking tuners are highly beneficial for bassists because they allow you to secure the string in place instantly, reducing string slippage and making much faster string changes.
While the mechanism is similar, 5-string basses often require tuners designed to handle the increased tension of the low B-string. Always ensure the specific model is rated for the tension of your string configuration.
Research & Insights
Our Analysis of Metallor Bass Guitar Tuning Machines
1,035Reviews Analyzed
9Products Evaluated
6.6Avg PM Score
1Brands Ranked
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