A well-cut nut helps a guitar tune smoothly and play comfortably in the first few frets. The right files make it easier to cut slots that fit the strings without going too deep or too wide.
These 10 picks span gauged electric and acoustic sets, a larger shop kit, and lower-cost options. The guide below will help you choose by string gauge, instrument type, and how often you cut nuts.
Best 10 Nut Files for Guitar Luthiers Picks for 2026
Round-Profile Electric Pick
MusicNomad MN668 Light Electric Nut Files
- Six sizes from .010 to .046 inches
- Round-profile, diamond-coated blades
- Aluminum storage case included
Best For: Light-gauge electric guitar nut work
Double-Edge Electric Option
Tapered Electric Guitar Nut File Set
- Six edges across three files
- Tapered, V-shaped cutting profile
- PVC storage bag included
Best For: Electric slots needing the listed tapered file sizes
Acoustic Gauge Match
MusicNomad MN670 Acoustic Nut Files
- Six acoustic sizes from .013 to .056 inches
- Diamond-coated, round-profile blades
- Engraved sizes and aluminum case
Best For: Light-to-medium acoustic guitar nut slots
Holmer Tapered Set
Holmer Three-Piece Electric Nut Files
- Three double-edged electric files
- Six tapered sizes from .010 to .046 inches
- Rubber handles and PVC carrying bag
Best For: Electric nut and bridge slots with tapered files
Broadest Size Range
MusicNomad MN676 16-Piece Diamond Nut File Set
- 16 sizes from .010" to .130"
- Round, diamond-coated blades
- Case and cleaning brush included
Best For: Shops handling varied nut and saddle sizes
Files Plus Sandpaper
- 13 sizes from 0.4 to 1.6 mm
- Nine sanding sheets included
- Circular stainless steel files
Best For: Metric-sized filing with sandpaper on hand
Super-Light Electric Pick
MusicNomad MN667 Six-Piece Diamond Set
- Six super-light electric sizes
- Round, diamond-coated blades
- Compact aluminum case
Best For: Electric setups matching the six supplied gauges
Medium-Gauge Pick
StewMac 10–46 Gauged Nut Files
- Six files sized .010–.046 inches
- Round-bottom nut and saddle slots
- Twin 4-inch cutting edges
Best For: Medium-gauge electric guitar setups
Replaceable-Wire Option
iLuiz 6-Piece Nut Slotting Set
- Replaceable wires in an aluminum frame
- Six sizes from .010–.046 inches
- Pouch, wire box, and brush included
Best For: Electric-guitar nut work with replaceable cutting elements
Light-String Pick
StewMac Electric Guitar Nut File Set
- Six light-string sizes, .010–.042 inches
- Chrome-alloy steel files
- Lifetime Promise and tech support
Best For: Light-string electric guitar setups
Round-Profile Electric Pick – MusicNomad MN668 Light Electric Nut Files
For nut files for guitar luthiers working on light-gauge electrics, the MusicNomad MN668 supplies six dedicated sizes from .010 to .046 inches. Its diamond-coated, round-profile blades are designed to cut and polish slots that match the shape of the strings.
Best For: Slotting or refining nuts for six-string electric guitars using the listed light-gauge string sizes.
Pros:
- Six separate files: .010, .013, .017, .028, .036 and .046 inches.
- Diamond coating cuts on push and pull strokes and works on nylon, bone and TUSQ.
- Ergonomic handles, protective tip bumpers and a compact aluminum case support controlled work and storage.
Cons:
- Its specified sizes may not suit other string gauges; check your string set before buying.
- Six individual files take more tool changes than a three-file, double-edged set.
Choose this set when the listed gauges match your electric strings and a round slot profile is a priority. MusicNomad offers other gauge-specific sets if they do not.
Double-Edge Electric Option – Tapered Electric Guitar Nut File Set
This three-file set is an option among nut files for guitar luthiers who want six electric-guitar cutting sizes on double-edged tools. Its tapered, V-shaped edges are intended for making nut and bridge slots.
Best For: Electric-guitar slotting when you prefer double-edged files and the listed sizes fit your job.
Pros:
- Three double-sided files provide .010, .013, .017, .026, .036 and .046-inch edges.
- Long filing surfaces and rubber handles provide a comfortable grip.
- Includes a PVC bag to help keep the cutting edges separated in storage.
Cons:
- The V-shaped cutting profile will not make the same round-bottomed slot as a round-profile file.
- Its .026-inch edge differs from the .028-inch size supplied in the MusicNomad light-electric set; verify your target gauges.
The paired edges make this a compact way to cover the stated electric sizes. Check the intended slot shape and string gauges before choosing it over dedicated round-profile files.
Acoustic Gauge Match – MusicNomad MN670 Acoustic Nut Files
Acoustic setups call for different gauges than light electric sets. Among nut files for guitar luthiers, the MusicNomad MN670 targets light-to-medium acoustic strings with six diamond-coated files sized .013 through .056 inches.
Best For: Cutting or polishing acoustic-guitar nut slots for the listed light-to-medium string sizes.
Pros:
- Dedicated .013, .017, .024, .032, .042 and .056-inch files.
- Round, string-shaped blades are designed for smooth, precise cuts.
- Laser-engraved sizes, ergonomic handles and an aluminum storage case help with identification, handling and storage.
Cons:
- Its acoustic-oriented sizes are not a substitute for every electric or acoustic string set.
- Six separate files require switching tools between slot sizes.
This is the more directly matched MusicNomad option for the specified acoustic gauges. Confirm your strings against all six file sizes, especially if you use a custom set.
Holmer Tapered Set – Holmer Three-Piece Electric Nut Files
The Holmer set gives nut files for guitar luthiers another three-piece, double-edged choice for electric guitars. Its six tapered, V-shaped edges are sized for nut and bridge slotting, with rubber handles for grip.
Best For: Electric-guitar nut or bridge slot work using the six stated cutting sizes.
Pros:
- Three double-sided files cover .010, .013, .017, .026, .036 and .046 inches.
- Long filing surfaces and rubber handles aid handling.
- A PVC carrying bag helps prevent the file edges from contacting one another in storage.
Cons:
- V-shaped edges do not cut the same round-bottom profile as round-profile nut files.
- The supplied size range is aimed at electric guitars; check it against other instruments or string sets.
Holmer is a practical fit if you specifically want these electric sizes in a three-tool format. For a rounded slot bottom, consider a set with round-profile blades instead.
Broadest Size Range – MusicNomad MN676 16-Piece Diamond Nut File Set
For luthiers comparing nut files for guitar luthiers, the MusicNomad MN676 offers 16 sizes from .010″ to .130″ for work across different instruments. Its diamond-coated, round blades are designed to cut and polish nut slots in one pass.
Best For: Shops that need a wide range of file sizes for varied nut and saddle work.
Pros:
- Includes 16 labeled sizes, from .010″ to .130″.
- Round, diamond-coated blades are designed for smooth cuts without bending.
- Includes an organizational case and cleaning brush.
Cons:
- The 12″ x 7″ x 2″ case takes more storage space than a compact six-file set.
This is the versatile pick when size coverage matters most; the larger case is the practical trade-off.
Files Plus Sandpaper – iLuiz 13-Size Nut File Set
The iLuiz set combines 13 circular-cross-section stainless steel files with nine sheets of sandpaper. Among nut files for guitar luthiers, it suits buyers who want tools for filing slots and doing additional polishing in one kit.
Best For: Guitar, bass, or ukulele work where a range of metric file sizes and sandpaper are useful.
Pros:
- Includes 13 file sizes from 0.4 mm to 1.6 mm.
- Comes with nine sheets of 240- and 320-grit sandpaper.
- Longer shafts provide more working length than shorter files.
Cons:
- Files are sized in millimeters, so matching inch-labeled strings may require conversion.
- The supplied files top out at 1.6 mm.
Choose this kit if its metric size range fits your strings and you will use the included sanding sheets.
Super-Light Electric Pick – MusicNomad MN667 Six-Piece Diamond Set
If you need nut files for guitar luthiers working on super-light electric strings, the MusicNomad MN667 provides six diamond-coated sizes: .010″, .013″, .017″, .024″, .032″, and .042″. The set comes in a compact aluminum case.
Best For: Electric-guitar setups that match the supplied super-light string sizes.
Pros:
- Six laser-engraved file sizes match the stated super-light set.
- Round, diamond-coated blades are designed to cut and polish slots.
- Includes a compact 3″ x 6″ x 1.4″ aluminum case.
Cons:
- Only six sizes are included; check your string gauges before choosing this set.
This focused set avoids carrying a broader size range, but its value depends on whether those six gauges match your work.
Medium-Gauge Pick – StewMac 10–46 Gauged Nut Files
For nut files for guitar luthiers working with 10–46 electric strings, this StewMac set provides six dedicated sizes. Its chrome-alloy steel files have twin 4-inch cutting edges designed to cut round-bottom nut and saddle slots.
Best For: Guitar techs and players setting up electric guitars with medium-gauge strings.
Pros:
- Six gauges: .010, .013, .016, .028, .035, and .046 inches.
- Round-bottom cutting profile supports proper string seating.
- Twin 4-inch cutting edges on each file.
Cons:
- Included gauges are selected for medium electric strings; other string sets may require additional sizes.
Choose this set when its listed gauges match your strings. Check the individual slot sizes before cutting, especially if your set differs from the included gauges.
Replaceable-Wire Option – iLuiz 6-Piece Nut Slotting Set
Among nut files for guitar luthiers, the iLuiz set stands out for its replaceable filing wires and included storage accessories. Its six listed sizes run from .010 to .046 inches, with diamond-coated stainless steel wires for the three narrowest slots and toothed stainless steel rods for the wider ones.
Best For: Players or techs who want replaceable cutting elements and an organized kit for electric-guitar nut work.
Pros:
- Replaceable filing wires mount in an aluminum-alloy frame.
- Includes two wires each for the .010, .013, and .017-inch sizes.
- Comes with a storage pouch, wire box, and cleaning brush.
Cons:
- The narrow and wide gauges use different cutting-element designs, so the feel may vary by size.
- Its .017 and .036-inch sizes may not match every string set.
This is a practical choice if you value replaceable parts and included storage. Match its .010, .013, .017, .028, .036, and .046-inch sizes to your intended strings before buying.
Light-String Pick – StewMac Electric Guitar Nut File Set
For nut files for guitar luthiers setting up light-string electric guitars, this StewMac set offers six gauges from .010 to .042 inches. The chrome-alloy steel files have twin 4-inch cutting edges for cutting accurately sized nut slots.
Best For: Guitar techs and players whose light electric string gauges match the six included files.
Pros:
- Includes .010, .013, .016, .024, .032, and .042-inch files.
- Twin 4-inch cutting edges on each chrome-alloy steel file.
- Backed by StewMac’s Lifetime Promise and expert tech support.
Cons:
- The included sizes are aimed at light electric strings; heavier sets may need other gauges.
Pick this set when its lighter bass-string gauges fit your setup. Checking your string sizes first will help you choose between this set and a medium-gauge option.
How We Picked These Nut Files for Guitar Luthiers
We focused on the distinctions that matter at the bench: stated file gauges, intended instrument and string set, file design, and whether a kit covers one setup or several. The selection includes dedicated gauged sets, diamond-coated options, tapered double-edge files, and a broader shop set. Product listings do not establish cutting performance on their own, so confirm current sizes and contents before buying.
Quick Comparison: Which Type of Set Fits Your Work?
For a known electric string set: A gauged six-file set is the most direct starting point. The MusicNomad MN667 and MN668 target super-light and light electric strings, respectively; the iLuiz set lists .010–.046-inch sizes, while the StewMac electric sets distinguish light from medium 10–46 strings.
For acoustic or mixed work: The MusicNomad MN670 is an acoustic-focused set. The 16-piece MN676 offers a wider selection for a bench that handles different instruments or string gauges, though you should still check its included sizes against your jobs.
For occasional shaping or a tighter budget: The tapered double-edge sets and the 13-size needle-file kit offer different approaches to slotting. Check their actual working widths and profiles before relying on them for a precise final fit.
Key Buying Factors for Nut Files for Guitar Luthiers
Match the File to the String
Start with the gauges you actually install, not just a kit labeled “electric” or “acoustic.” A slot must let the string sit and move freely without excessive side-to-side play. If you use several tunings or heavier replacement strings, check whether the included sizes cover them; a six-piece set may suit one common string set but leave gaps elsewhere.
Look at Slot Profile and Control
A rounded-bottom slot supports the string more appropriately than a sharp V-shaped cut. Gauged files can make a target width easier to judge, while tapered files require attention to cutting depth because the working width changes along the tool. Choose a file you can keep aligned with the string’s path toward the tuner, and work in small passes.
Consider the Whole Setup
Good files do not replace careful measurements. Use the correct setup reference for your instrument, check first-fret clearance often, and leave the slot’s break point at the front edge of the nut. Removing more material is easy; restoring an over-deep slot usually means repair or replacement.
Who Should Buy Which Nut Files for Guitar Luthiers?
Choose a dedicated light, super-light, or medium electric set if you repeatedly service guitars with that string range. Pick the acoustic-focused set for mostly steel-string acoustic work. A broader shop set makes more sense if varied gauges regularly come across your bench. If you are learning or doing a one-off job, a lower-cost set may be enough, but verify its sizes and practice on a spare nut before cutting the instrument you care about.