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PICKUPS: Fishman Full Circle Sizing FAQ
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Fishman Full Circle Pickup
Which size do I need?


The Full Circle Pickup from Fishman is offered in three different thread sizes, since not all bridges use the same sized adjuster wheels. Of the choices, the SAE ¼x20 is the most common bolt size by far. Almost all of the adjustable bridges we've ever sold at Gollihur Music are of this size (the only exception; at one time we carried a limited quantity of bridges that had threaded inserts - these were of the somewhat less common 6x1 metric persuasion).

The easiest and most fool-proof way to tell which size you need is to take out your current adjuster wheel and count how many threads there are in a ½ inch along its threaded edge (since the wheel doesn't quite have a full inch of threads). If this measurement shows that your current bridge has 10 threads per half inch (20 threads per inch), similar to the graphic at right, you need the SAE 1/4"-20 version of the Full Circle. If it has 9 threads in a half inch (18 per inch) than it's possible you have the new 5/16"-18 version. (You can double-check by measuring the end diameter of the threaded post - the new version is threaded onto a larger post, 5/16".)

If you aren't even close to 20 threads per inch, try counting threads next to a metric ruler - if the threads are spaced exactly one millimeter apart, you've got a metric-threaded bridge (and need the 6x1mm version of the Full Circle).

These printable gauges from Bolt Depot (a purveyor of hardware items) may also help you to count threads accurately.

If you are uncertain about the size, here's another tip: Go to a decent sized hardware store (e.g. Ace Hardware or True Value franchise) and visit their aisle with all the little drawers with all the different sized nuts, bolts, etc. Buy one or more nuts (usually less than 35 cents each) in the size you think is correct, remove the adjuster from your bridge, and see which size bolt fits.



Here's a photo of the adjusters side by side, for comparison.


The shorthand:
SAE ¼x20 means: ¼" post, threaded with 20 threads per inch
Metric 6x1mm means: 6mm post, threaded with 1 thread per millimeter
SAE 5/16"x18 means: 5/8" post, threaded with 18 threads per inch



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The Fine Print:

The information contained herein is based on what's in my brain — and/or my observations and opinions from my personal experiences (and those of Bob, before me) — as of this moment today, and is subject to change. I'm sure that a great deal more information and detail could be added — but the intent of these writings is to present easily understood, quick FAQs, to address common questions and improve the reader's general knowledge.

What's written here is by no means any kind of authoritative absolute answer, for I am not the world's greatest authority on bass (not even close), or on much of anything else, for that matter. So, by all means, get a second opinion, and know that all the information provided here is for general informational purposes only. I am not providing professional advice; be aware that, where applicable, any information acted upon is at your own risk.

I simply and sincerely hope the information and opinions here are helpful to you on your quest for knowledge about the bass and related subjects... that's the point!

I welcome email with dissenting and additional viewpoints/information/updates that help improve my personal awareness and these content pages. If you have a question that you think belongs here, please let me know.
Mark