Sperzel Tuning Machines
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Sperzel Trim-Lok Tuners

Sperzel Trim-Lok Tuners

Satin body with Chrome buttons
These tuners are available in either 3 per side or 6 on a side. Please indicate preference.
If you are looking for a color or a combination tuners please indicate color selections or contact us for assistance.

Sperzel tuning keys are machined from solid billet aluminum for light weight and held to precise tolerances and quality checks to produce a precision tuning key that eliminates shaft wobble, endplay and minimum backlash. Sperzel Trim-Lok is their locking tuner that offers no tying or winding around string posts, greatly improving your tuning capabilities for playing style and enjoyment. Sperzel tuning machines are bringing in the next generation of tuners. Sperzel locking tuners can easily adapt to any guitar as a retrofit. There are no screw holes to align with existing holes.

Sperzel tuners are designed with a 12:1 gear ratio. The tuner shaft is designed to a slightly smaller diameter than standard guitar tuners. With the Sperzel locking tuners, the string is locked into place and not required to wrap the shaft to prevent slippage. When you compare the length of string pulled by a standard tuner and the length pulled by the smaller diameter Sperzel tuning machines you find the 12:1 ratio compares more closely to 18:1 against other tuners.

Sperzel uses aluminum to offer a wide range of anodized colors in solids or combinations. Anodizing is a very durable finish that does not affect the integrity or precision of the tuning key.

Break out of the old 1918 mold age and step up to the New Age tuning machines!

Sperzel tuning machines come in several styles.

Enclosed Housing

Open-Back Housing

This is the ultimate in locking tuning keys. The locking feature eliminates the need for multiple string wraps, and trem users no longer need a locking nut that deadens string sustain and all annoying Allen screws and wrenches (added weight). Tired of tying strings? This is the answer. This model is proven to hold strings tightly, allowing the guitar to stay in tune to improve playing enjoyment. The Trim-Lok is a mechanical type locking system that can be used on ANY guitar, including non-trem or acoustic.
This is a more friction-passive positive locking tuner which still eliminates multiple wraps around the string post. Usually a 1/2 to a full wrap locks the string tightly, improving tuning stability for any electric guitar, acoustic guitar or bass.
This are our non-locking tuners that requires tying and winding. They incorporate all the precision machining in a traditional style. You can feel the solid integrity. This tuning machine was featured on the 25th anniversary Strat.
Bass Locking Tuners
The same unique design and machining as our Trim-Lok tuners in a bass model, eliminating the need for multiple wraps around the string post. Our bass tuners will fit in a 7/16" hole in head stock.
The "D" Thing
A Universal replacement unit drop tuner that is easy to install and simple to use. No big bulky contraption to mount, D Thing is integrated into the tuning key.


Here's how the SPERZEL Trim-Lok works:
The Sperzel locking tuner is a very simple mechanism to use that accomplishes a great deal.Re-stringing a guitar is very quick and easy using the locking tuner. PLus they offer the benefit of keeping the guitar in tune much better than a friction tuner. This is especially helpful with electric guitars equipped with tremolo bars. However, I use these on all my acoustic guitars as well.

The Trim-Lok is a mechanical locking tuner. First you loosen the locking knob until locking pin inside string post clears string hole. Now, insert string into hole and pull string all the way through post until tight, while holding string screw the locking knob in until the string is locked to post. Do not over-tighten; finger tight will do. Then, tune to pitch (Approximately 1/2 turn with tuning button). You should be in tune; cut excess string and repeat the process for remaining strings

REMEMBER, there is NO TYING or WINDING of the string on the Sperzel Trim-Lok, which stabilizes tuning. There is less stretching of the string because you have taken the slack out by pulling tightly when starting. Also, the string does not have to seat itself.

NOTE! When installing staggered post height sets, there are two short posts, two medium posts and two long posts. Start with high "E" string and work back towards low "E."
The short post ---------- High E & B strings
The medium post ----- G & D strings
The long post ----------- A & Low E string

Rule of Thumb: Always start with the shortest post furthest away and longest post closest to the nut.

Here's how the SPERZEL Sound-Lok Works

The Sperzel Sound-Lok tuner is a friction lock system, and has the look but not the inconvenience of vintage safety posts of the past, where you had to measure the string and cut to length. This was very time-consuming and wasteful, especially if you cut the string short.

The Sperzel Sound-Lok needs no measuring; simply insert string into the hole by the slot and feed string all the way through the shaft until it comes out the bottom of the post. Pull the string until tight, then bend the string so it lies in the slot on top of the post. With your thumb holding the string in place, tune to pitch with tuner button (Approximately 1/2 - 1 full wrap is required). The string will automatically grab and lock into place. Cut any excess string and repeat for the remaining strings.

Sperzel offers a number button shapes and finishes to choose from and also comes in colors

(From left to right): No. 1, No. 2, No. 5 & No. 6
*Images not actual scale, please call for details.
Sperzel Buttons


Sperzel tuning keys offer our unique design and precise machining tolerances to eliminate shaft wobble and provide minimum backlash and endplay, which greatly reduce your guitar's tuning problems. Our housing extends further up the shaft with the bushing threads on the outside, keeping the string post solid.

All guitar models are easily reversible, allowing conversion to left-handed or custom configurations. Sperzel has been manufacturing staggered string posts since the late 1970s, allowing for better pull through the nut and reducing the use of string trees on six-in-line guitars with flathead stocks. Guitars with tilt-back head stocks use all one post height; our years of experience will help you determine the height you need. This is important to know when ordering the correct set of keys for your guitar - staggered for flat; non-staggers for tilt-back.

Sperzel's unique design allows you to choose the style of housing (or body), Enclosed or Open Back, and also what model string post, Trim-Lok, Sound-Lok or Solid-Pro, is right for you.

All Sperzel tuning keys can be assembled in either body (housing) style:

Dare to be Different: Anodized Colors and Satin Finishes

All Sperzel tuning keys are available in many colors and combinations to individualize your guitar. Break away from traditional plated finishes. In reality, the anodized finish is better for the integrity of the tuning key because it is etched into the components and does not affect tolerances and is more environmentally sound. Plating is a coating and is not environment-friendly.

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