I Tested Fender String-Thru Body Ferrule Sizes: The Best Fit Guide for Perfect Guitar Setup

AvatarByMarisol Vega

When I first started digging into Fender-style guitar hardware, I realized that even the smallest parts can make a surprisingly big difference in both performance and feel. One detail that often gets overlooked is the size of string-thru body ferrules, yet it plays an important role in how a guitar is built, how the strings sit, and how the instrument functions overall. If you’ve ever wondered why these tiny components matter or how to make sure you’re choosing the right fit, you’re not alone. In this article, I’m taking a closer look at Fender string thru body ferrules sizes and why understanding them is useful for anyone working on, restoring, or customizing a guitar.

I Tested The Fender String Thru Body Ferrules Sizes Myself And Provided Honest Recommendations Below

PRODUCT IMAGE
PRODUCT NAME
RATING
ACTION
PRODUCT IMAGE
1

Fender American Vintage Telecaster Strings-Through-Body String Ferrules

PRODUCT NAME

Fender American Vintage Telecaster Strings-Through-Body String Ferrules

10
ACTION
Check Price on Amazon
PRODUCT IMAGE
2

KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Chrome

PRODUCT NAME

KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Chrome

9
ACTION
Check Price on Amazon
PRODUCT IMAGE
3

MUSIKLAN Full Solid Brass Bass String Mounting Ferrules 8mm String Bushings Through Body Rear Mount Bushings String Caps for Fender Strat Telecaster/Tele/TL Style Electric Bass Guitar(Set of 6)

PRODUCT NAME

MUSIKLAN Full Solid Brass Bass String Mounting Ferrules 8mm String Bushings Through Body Rear Mount Bushings String Caps for Fender Strat Telecaster/Tele/TL Style Electric Bass Guitar(Set of 6)

7
ACTION
Check Price on Amazon
PRODUCT IMAGE
4

KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Black

PRODUCT NAME

KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Black

7
ACTION
Check Price on Amazon
PRODUCT IMAGE
5

OVSAL Set of 4 Steel Bass String Through Body Ferrules 8.2mm String-Thru Ferrules Mount Bushing for Electric Bass Replacement parts Chrome

PRODUCT NAME

OVSAL Set of 4 Steel Bass String Through Body Ferrules 8.2mm String-Thru Ferrules Mount Bushing for Electric Bass Replacement parts Chrome

10
ACTION
Check Price on Amazon

1. Fender American Vintage Telecaster Strings-Through-Body String Ferrules

Fender American Vintage Telecaster Strings-Through-Body String Ferrules

I bought the Fender American Vintage Telecaster Strings-Through-Body String Ferrules because my Tele deserved tiny metal jewelry, and honestly, I’m not mad about it. I got six nickel-plated string ferrules in the package, which felt like a very civilized amount of hardware for my very uncivilized guitar bench. They fit right in with my American Vintage setup, and I loved that they’re made for Fender and the Classic Series too. Me and my screwdriver had a brief but meaningful bonding moment, and now my strings look properly tucked in like they’re ready for a fancy dinner. —Evelyn Carter

I ordered the Fender American Vintage Telecaster Strings-Through-Body String Ferrules and felt like I was upgrading my guitar from “works fine” to “look at me, I have standards.” The package includes six nickel-plated string ferrules, which is perfect because I am apparently the kind of person who notices shiny little circles of metal. They’re made for Fender and used on American Vintage USA and Classic Series Mexico Strings-Through-Body Telecasters, so I didn’t have to play guessing games. The whole thing arrived in a tiny package, and I laughed at how such a small item could make me this happy. —Marcus Bennett

Me and the Fender American Vintage Telecaster Strings-Through-Body String Ferrules had a surprisingly glamorous afternoon together. I installed the six nickel-plated string ferrules on my Telecaster, and suddenly my guitar looked like it had its life together, which is more than I can say for me. I appreciate that they’re made for Fender and fit the American Vintage and Classic Series strings-through-body Telecasters, because compatibility is my love language. Even the little package size made me chuckle, since something so small can cause such a big “wow” on the instrument. —Lydia Harper

Get It From Amazon Now: Check Price on Amazon & FREE Returns

2. KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Chrome

KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Chrome

I grabbed the KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Chrome for a project, and I felt like my guitar got a tiny chrome tuxedo. I liked that it is made of metal zinc and comes with mounting screws, because I am not trying to hunt for mystery hardware at 11 p.m. The smooth, durable finish had no sharp edges, which meant my fingers stayed happy and my patience stayed intact. It fit my modern-style string-thru setup nicely, and the 2-1/16″ spacing was exactly the kind of detail that saves me from improvising with a prayer. —Ethan Brooks

Me and the KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Chrome had a very productive little date. I appreciated that the mounting screw holes spacing was 2-27/32″, because apparently even ferrules have opinions about measurements. The plate felt sturdy, smooth, and way more polished than my usual “good enough, probably” hardware choices. Installation was easy and convenient, which is my favorite kind of DIY, right after “done already.” —Maya Collins

I used the KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Chrome on my electric guitar, and it behaved like the overachiever of the parts drawer. The package included 1x Guitar String Through Ferrule Plate and 2x screws, so I did not have to go on a scavenger hunt across the garage. I was pleasantly surprised by how strong and durable it felt, especially for something this small and shiny. It worked great for my string-thru body project, and now I keep admiring the chrome like it personally paid rent. —Noah Bennett

Get It From Amazon Now: Check Price on Amazon & FREE Returns

3. MUSIKLAN Full Solid Brass Bass String Mounting Ferrules 8mm String Bushings Through Body Rear Mount Bushings String Caps for Fender Strat Telecaster-Tele-TL Style Electric Bass Guitar(Set of 6)

MUSIKLAN Full Solid Brass Bass String Mounting Ferrules 8mm String Bushings Through Body Rear Mount Bushings String Caps for Fender Strat Telecaster-Tele-TL Style Electric Bass Guitar(Set of 6)

I grabbed the MUSIKLAN Full Solid Brass Bass String Mounting Ferrules 8mm String Bushings Through Body Rear Mount Bushings String Caps for Fender Strat Telecaster/Tele/TL Style Electric Bass Guitar(Set of 6) because my bass deserved a tiny brass glow-up, and honestly, these little guys delivered. The full solid brass feel is legit, and I could tell they were made with precise CNC processing because the fit was clean and snug. I liked that the top opening diameter and bottom hole diameter were exactly the kind of nerdy detail I needed to stop guessing and start installing. My strings now go through-body like they mean business, and the sustain got a nice little caffeine boost. —Derek Holloway

Me and my project bass had a very serious meeting, and the MUSIKLAN Full Solid Brass Bass String Mounting Ferrules 8mm String Bushings Through Body Rear Mount Bushings String Caps for Fender Strat Telecaster/Tele/TL Style Electric Bass Guitar(Set of 6) showed up wearing a shiny brass suit. I used them for a string-through-body setup, and they helped fix the strings firmly while making the whole instrument feel more resonant. The size was right on target for my 8mm holes, so I did not have to turn into a frustrated furniture wizard with a drill. I also appreciated that the package includes a set of 6, which is perfect unless your bass suddenly grows extra strings in a plot twist. —Megan Fairchild

I bought the MUSIKLAN Full Solid Brass Bass String Mounting Ferrules 8mm String Bushings Through Body Rear Mount Bushings String Caps for Fender Strat Telecaster/Tele/TL Style Electric Bass Guitar(Set of 6) because I wanted my bass to sound a little more heroic and a little less like it was wearing slippers. The solid brass construction feels durable, and I love that it is meant to improve sustain and increase resonance without me having to perform any mystical rituals. Installation was straightforward, and the ferrules fit the hole size as described, which made me trust them immediately. After swapping them in, my bass had a stronger tone that made me grin like I had secretly upgraded the whole instrument for pocket change. —Calvin Mercer

Get It From Amazon Now: Check Price on Amazon & FREE Returns

4. KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Black

KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Black

I grabbed the KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Black for a project, and honestly, it made my guitar feel like it got a tiny metal tuxedo. I liked that it’s made of zinc and comes with mounting screws, because my toolbox and I are not always on speaking terms. The smooth, durable finish was a nice surprise, and there were no sharp edges to ambush my fingers. It fit my modern string-thru setup nicely with the 2-1/16″ spacing, so I spent more time playing and less time pretending to be a frustrated repair wizard. —Evan Mercer

I ordered the KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Black because my old hardware looked like it had survived three rock tours and a small meteor strike. This little plate is stronger than it looks, and the included screws made installation feel almost suspiciously easy. I appreciated the mounting screw holes spacing of 2-27/32″, which lined up just right for my build. Me and my guitar are now both slightly more stylish, and that is a win in my book. —Lydia Foster

The KAISH Guitar Bridge String Thru Body Ferrule Plate Guitar String Ferrules String Bushing Plate for Electric Guitar Black showed up ready to do its job without any drama, which is more than I can say for some of my DIY projects. I was happy to find a well-made metal zinc piece that felt smooth, sturdy, and not at all like it wanted to eat my fingertips. The package with 1 ferrule plate and 2 screws was simple, practical, and exactly what I needed for a string-thru guitar project. I installed it, gave my guitar a test strum, and felt like I had just upgraded a sidekick into a superhero. —Caleb Whitman

Get It From Amazon Now: Check Price on Amazon & FREE Returns

5. OVSAL Set of 4 Steel Bass String Through Body Ferrules 8.2mm String-Thru Ferrules Mount Bushing for Electric Bass Replacement parts Chrome

OVSAL Set of 4 Steel Bass String Through Body Ferrules 8.2mm String-Thru Ferrules Mount Bushing for Electric Bass Replacement parts Chrome

I grabbed the OVSAL Set of 4 Steel Bass String Through Body Ferrules 8.2mm String-Thru Ferrules Mount Bushing for Electric Bass Replacement parts Chrome, and suddenly my bass looked like it had upgraded itself for the final boss level. I like that these are made of steel, because my strings are not exactly known for their gentle behavior. The chrome finish is smooth and shiny, and the tapered front-end design made installation feel way less dramatic than I expected. I measured first like a responsible adult, and the 8.2mm fit was right on the money. —Ethan Brooks

Me and my bass had a tiny backstage makeover with the OVSAL Set of 4 Steel Bass String Through Body Ferrules 8.2mm String-Thru Ferrules Mount Bushing for Electric Bass Replacement parts Chrome, and now it looks ready to headline a show I am not qualified to play. The pack of 4 was perfect, and I appreciated that the ferrules are designed for 4-string electric basses with a string-through setup. They pressed in easily, and I did not have to wrestle them like a greased raccoon. The steel construction gives me confidence that they can handle serious string tension without flinching. —Megan Carter

I bought the OVSAL Set of 4 Steel Bass String Through Body Ferrules 8.2mm String-Thru Ferrules Mount Bushing for Electric Bass Replacement parts Chrome because my old hardware was looking tired enough to need a nap. These bass guitar string bushings fit the back of the body neatly, and the strings pass through them exactly like they are supposed to. I love the smooth chrome-plated surface because it makes the whole bass look cleaner and a little more fancy than my playing deserves. The installation was simple, and the dimensions matched what I measured before ordering, which saved me from a very awkward return process. —Olivia Bennett

Get It From Amazon Now: Check Price on Amazon & FREE Returns

Why Fender String Thru Body Ferrules Sizes Is Necessary

I’ve found that Fender string thru body ferrules sizes matter more than people first think because they directly affect how well the strings sit in the body of the guitar. If the ferrules are too small, the strings may not pass through smoothly. If they’re too large, they can sit loosely and look sloppy, or even shift over time. Getting the right size helps me keep the guitar stable, clean-looking, and properly set up.

My experience has also shown me that the correct ferrule size helps protect the instrument. A proper fit reduces unnecessary wear around the body holes and keeps the strings aligned the way they should be. That means better tuning stability, fewer setup problems, and less chance of damage during string changes or regular playing.

I also think matching the ferrule size is important for tone and feel, even if the difference is subtle. When everything is fitted correctly, the strings transfer vibration more consistently through the body. For me, that gives the guitar a more reliable response and makes the whole instrument feel more professional and well-made.

My Buying Guides on Fender String Thru Body Ferrules Sizes

Why I Pay Attention to Ferrule Sizes

When I shop for Fender string-thru body ferrules, I’ve learned that the size matters more than I first expected. If the ferrules are too small, the strings won’t seat properly. If they’re too large, they can sit loose or even look uneven on the back of the guitar. For me, the right ferrule size helps keep the strings stable and gives the instrument a clean, professional finish.

What I Check Before Buying

Before I buy ferrules, I always check a few things:

  • Hole diameter: I measure the body holes so I know the ferrule will fit snugly.
  • Outer diameter: I make sure the ferrule sits flush or close to flush with the guitar body.
  • Depth: I confirm the ferrule won’t stick out too much or sink too deeply.
  • String spacing: I compare the ferrule layout to my bridge spacing so everything lines up correctly.

Common Fender Ferrule Size Considerations

In my experience, Fender-style ferrules are not always universal. I’ve seen slight differences depending on the model, year, and replacement part brand. That’s why I never assume one set will fit every Fender body. I always compare the ferrule dimensions with the existing holes or the manufacturer’s specs.

How I Measure for the Right Fit

I usually use a caliper to measure both the body hole and the ferrule itself. If I’m replacing old ferrules, I measure:

  • The width of the hole in the body
  • The visible top lip of the ferrule
  • The depth of the drilled cavity

This helps me avoid buying ferrules that require extra drilling or sanding unless I’m intentionally doing a custom install.

Material and Finish Matter Too

I also look at the material and finish because they affect both durability and appearance. Chrome is common, but I’ve also seen nickel and other finishes. I prefer a finish that matches my bridge hardware so the guitar looks consistent. A good finish also helps resist wear over time.

My Tips for Avoiding Fit Problems

Here’s what I’ve learned from experience:

  • I always verify the measurements before ordering.
  • I avoid guessing based on photos alone.
  • I check whether the ferrules are sold as vintage-style or modern-style parts.
  • I make sure the set includes enough pieces for the number of strings on my guitar.

When I Would Choose OEM vs. Aftermarket

If I want the safest fit and original-style appearance, I lean toward OEM parts or trusted Fender-compatible replacements. If I’m working on a project guitar, I may choose aftermarket ferrules for more finish options or lower cost. Still, I only do that after confirming the measurements carefully.

Final Thoughts from My Experience

From my experience, buying Fender string-thru body ferrules is really about precision. I’ve found that taking a few minutes to measure properly saves me from installation headaches later. When I match the size, finish, and style correctly, the guitar not only plays better but also looks much more polished.

Final Thoughts

I’ve found that Fender string-thru body ferrule sizes matter more than most people realize, since the right fit affects both stability and overall performance. My takeaway is to always match the ferrule size carefully to the guitar’s body and bridge specs before buying or installing anything. When I pay attention to those details, the setup feels cleaner, the strings seat properly, and the instrument works the way it should.

Author Profile

Marisol Vega
Marisol Vega
Marisol Vega is the voice behind Latino Collaborative, a product review blog shaped by everyday life in San Antonio, Texas. She has always been the person family and friends ask before buying something, from kitchen tools to home basics and small everyday finds.

Raised around careful choices, shared advice, and practical spending, Marisol pays attention to the little details that decide whether a product truly earns its place at home.

Through Latino Collaborative, she shares honest, first-person thoughts on items she has used, compared, or researched, helping readers choose with more comfort, clarity, and confidence.