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
In stock, ready to ship!



0.042" width

Item # 0833
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0.046" width

Item # 5313
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0.050" width

Item # 0834
In stock, ready to ship!



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 12 of 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
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Nut Slotting Files

By Pat Green from UK
(Customer's Reviews) Friday, December 23, 2011

These produce a very nice rounded shape for the nut slot with parallel vertical sides. I found matching the file gauge with the string gauge made the strings a pretty tight fit so I rock the file from side to side slightly to open the slot out a bit.The parallel sides of the file mean that if you haven't cut the nut top pretty close to the final profile the file snags a bit.

Overall I prefer the shape of the slot produced with this file than the double sided version which I also use (but doesn't snag)which produces a V shaped slot.

They are what they are!

By JLondon from Owensboro, KY
(Customer's Reviews) Wednesday, December 21, 2011

I mean, I don't know what the alternative would be and they do what they're supposed to do and do it well - what can I say. I've had a set of these since I started and I sure can't imagine being without them.

The Bee's knees!

By Rick Harrison from South Australia
(Customer's Reviews) Tuesday, December 20, 2011

Perfect for the purpose.

Another time saver!

By Wilmer Gingerich from Jamesport MO
(Customer's Reviews) Saturday, December 17, 2011

How would you do without a complete set of these well made files? Just makes nut work fast easy and precise!

Nut Slotting Filles

By David Harper from Lafayette, Indiana USA
(Customer's Reviews) Wednesday, December 14, 2011

I take older instruments and lower the action and make them easier to play fo the new player. I feel we have an obligation to make the instrument available to new players. These are great tools.

great slotting files

By dsteiner from Mechanicsburg, PA
(Customer's Reviews) Wednesday, November 09, 2011

I bought a couple of these to see how they would perform. They are very good quality. I ended up buying .010 through .050. I would defensively recommend them. I used them for nut slotting and ABR bridge filing. Great product.

Glad I Got These Files

By Slip'ry Dan Weisberg from San Jose, CA
(Customer's Reviews) Friday, November 04, 2011

I have a $100 acoustic guitar, and I didn't want to spend a fortune on tools, but I also wanted the job to go well, so I followed Dan Erlewine's advice in Guitar Player Repair Guide and got the .016", .024" and .035" size nut slotting files, along with a .012" X-Acto saw. I used feeler gauges to keep from filing too deep. The files worked great but I did put a scratch the peghead, so make sure the round end of the file is the one closest to the peghead.

Also, in spite of all my precautions, I filed too deep on a few slots, so have super glue handy. I didn't have any bone dust or baking powder, so instead I used a powdered white vitamin pill along with the super glue. When the filing was done, I rubbed some pencil graphite in the slot.

Great for a luthier's tool box

By praisegig from Texas
(Customer's Reviews) Wednesday, November 02, 2011

Excellent files for bass nut work. Makes setup a breeze.

Good files!

By J C S
(Customer's Reviews) Monday, October 31, 2011

These files do a very fine job! I suggest you score your string locations with a fine saw (.010 gauge works for me) before applying the files to slot work. It will keep them from slipping when starting. I checked their thicknesses with a micrometer and they were pretty spot on! (give or take a thousandth, not enough to make a difference) My only complaint is that they are fragile (I snapped a .013) due to their semi brittle material (that is why they stay sharp!) and they are pricey for such a small piece of metal.

Best Tool For The job

By M Dawes from South Shields, England
(Customer's Reviews) Saturday, October 29, 2011

I only ordered these gauged nut files on the 20/10/2011 and they arrived today, top marks for service. I purchased these files to complete a setup on my 1973 American Strat that had a split nut, after a great deal of contemplation I decided to replace the standard nut with an Earvana compensated nut. As was to be expected when I fitted the Earvana nut the action was far too high, although this was disappointing it was far better being too high than too low. I have now very accurately re-cut the nut and I am pleased to say that with the aid of these very high quality files my strat is now playing in tune for the first time since I purchased it in 1973.

I will still reserve judgment until I have played it long term, but initial results on my Peterson tuner indicate that the guitar is playing in tune right up to the twelfth fret apart from some 6 positions of minor -1% flats. Prior to changing the nut there was hardly a place below the 8th fret where the strings were in tune as they were mostly all sharp, so as I say the nut is doing what it is supposed to do. I only wish that when I ordered the files I had also ordered the ôNut Slotting Gaugeö at the same time as I had forgotten how time consuming it was to set up a nut with the standard feeler gauge method. I could have saved a lot of time and been more accurate with the Nut Slotting Gauge, I will have to put it on my wish list. The nut files that I purchased are as near as possible to my preferred string gauge i.e. 0010, 0013, 0016, 0024, 0035 and 0046ö, they are very fast at removing the required material and are a precision tool of excellent quality and very good value.

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