Nut Seating Files

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For 1/8" wide nut

Item # 5055
In stock, ready to ship!



For 3/16" wide nut

Item # 5056
In stock, ready to ship!



For 1/4" wide nut

Item # 5057
In stock, ready to ship!


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Nut Seating Files

Sturdy files for cleaning and squaring nut mounting surfaces. They file only the bottom of the slot, leaving the side walls unscarred.

These files have fine and medium cutting surfaces.

Each file is 7-3/8" (187.33mm) long, with 4" (101.60mm) cutting surfaces and a rubber-coated handle. To keep the file from binding in the slot, we have designed these files to be slightly narrower than the nut size specified. An undersized file also helps to prevent widening the slot width—ensuring a snug fit for your nut.

5055 For 1/8" (3.18mm) wide nut Works for Fender® guitars and basses
5056 For 3/16" (4.76mm) wide nut Works for Gibson® guitars, basses, banjos, and mandolins
5057 For 1/4" (6.35mm) wide nut Works for classical and Dobro® guitars

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.

Customer Reviews

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  • 4.67 average rating from 33 reviews
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Too narrow!

(Customer's Reviews)

I got the 3/16 file, expecting to be able to cut a nice 3/16 slot for a 3/16 wide nut, and found that the file is a full 1mm too narrow. That's a lot. I didn't really want to get the file from stew Mac to begin with, because they overcharge for simple tools so much.
The description says they are "slightly" narrower to avoid binding, but making it 20% narrower is ridiculous. Not happy. I don't really want to sand off a full 1mm from the nut width, nor should I have to. For this price I expected a precision tool.


no exact size 

(Customer's Reviews)

Strange thing here is the thickness of file, that's not equal to 1/8 of an inch (something like 2,7 mm instead of it). It's still possible to clean nut slot, but i need to move file from side to side while cleaning.

I have bought 1/8 and 3/16 ... but with this differences i need 1/4 " ..
it is bad beacause there is fees for France shiping !


Great Tool

(Customer's Reviews)

I used the 1/8" to seat a roller nut, very easy to use coarse on one edge and fine on the other so I have a nice smooth surface for the nut

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