Gauged Nut Slotting Files

  • 177 Reviews
  • Write a review

Our tempered edge-cut nut files produce round-bottom slots, to ensure that the strings seat properly in the nut without buzzing.

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0.010" width

Item # 0821
In stock, ready to ship!



0.013" width

Item # 0823
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0.016" width

Item # 0827
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0.020" width

Item # 0828
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0.024" width

Item # 0829
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0.028" width

Item # 0830
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0.032" width

Item # 0831
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0.035" width

Item # 0832
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0.042" width

Item # 0833
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0.046" width

Item # 5313
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0.050" width

Item # 0834
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0.056" width

Item # 0835
In stock, ready to ship!


Total: $0.00
Quantity: 20


Gauged Nut Slotting Files

It just makes sense to cut the string slots to match the string gauges! With this set of gauged files, your work is fast and accurate too.

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Our tempered edge-cut nut files produce round-bottom slots, to ensure that the strings seat properly in the nut without buzzing.

Each chrome-alloy steel file has twin 4" cutting edges. Among our most popular tools, these professional files help you get the job done quickly and correctly.

What files do I need?
Choose nut slotting files that are the same size or no more that a few thousands larger than your individual string gauges. A smaller file can also be rocked side-to-side to widen a slot to the desired size. For example, you can cut a .043" slot with a .042" file by moving it around a bit.

Tip: Slotting Tune-o-matic style saddles
Nut slotting files work great for metal saddles. Choose your file size as you would when slotting a nut: use the same gauge as the string, or a few thousandths larger. After filing to the desired depth, we suggest polishing the slot with Mitchell's Abrasive Cord to remove file marks and burrs.

Trade Secrets! Newsletter

Are you supposed to slot Tune-o-matic bridge saddles?

Customers often ask how and why they should put slots in the saddles of their new Tune-o-matic bridge. Erick Coleman provides the answers in this issue of Trade Secrets.

Product Instructions

Making a Nut, Step-by-Step

Dan Erlewine, of Stewart-MacDonald's R&D Team, walks you through making and installing a new nut.

Ratings & Reviews

Gauged Nut Slotting Files

  • Based on 177 Reviews
Displaying 1 of 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
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My favorites so far

By DeeCee from NY
(Customer's Reviews) Thursday, December 25, 2014

I like these best of all the nut slotting files I’ve tried. The bottoms of the slots come out truly rounded. I have a set of similar slotting files, purchased from StewMac about 20 years ago, and the current files are an improvement - they are definitely rounder - closer to a half circle than the old ones.
The one difficulty I’ve had with these is that when the very thin files get down to a certain depth, the file starts to get hung up in the nut material – the same way a saw might get hung up in wood when you get too deep...but that’s not a problem with the file, per se. I may fix this by cutting the top of the nut lower before I deepen the slots.


By Werther Ellerbrock from Mexico
(Customer's Reviews) Tuesday, July 01, 2014

I love my .010 gauge file! It's the best way to start my nut slotting especially for the treble strings.

Excellent precise tools

By Paul Balmer from England
(Customer's Reviews) Wednesday, June 18, 2014

If you do a lot of nut work then you need these files - accurate gauges and hard wearing - I use them in all my books Paul Balmer


By KrashBurn Guitars from Redding California USA
(Customer's Reviews) Wednesday, June 04, 2014

Wrote a long review attesting to how awesome these are and couldn't do without them. Anyway it got erased when I went to correct some things. So get the file set, it's expensive but the guitars will be at another greater level.

Why did I wait?

By BWH from NY
(Customer's Reviews) Thursday, May 22, 2014

I put off buying these forever. I finally got fed up with messing around with inferior methods and got these.One of the best things you can buy. My strings fit,and no more binding !

A must

By Jose Maria from Valladolid, Spain
(Customer's Reviews) Tuesday, April 29, 2014

The best tools ever to make great guitar nuts.

Gauged nut files

By psaltis john from greece
(Customer's Reviews) Tuesday, April 22, 2014

Precise cut, but not the size range that suits my needs!

Great tools!

By Suhr3825 from CA
(Customer's Reviews) Wednesday, April 02, 2014

A must have for doing proper nut work!


By sinvelikogmajstora from Cetinje, Montenegro
(Customer's Reviews) Monday, March 31, 2014

Combined with string spacing rule these files give perfect result. I had some problems with 0.010" one the first time but turns out it was human error :)

Love these

By JMW from Biggleswade, UK
(Customer's Reviews) Saturday, March 29, 2014

I have the full set and they get a lot of use. They still cut like new. Take extra care using the 0.010" file though as it would be easy to break it if it should snag.

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