---
product_id: 605238630
title: "MusicNomad MN850 Diamond Coated, Safe Zone Guitar Fret Crowning File (S-File)"
brand: "musicnomad"
price: "5138506₫"
currency: VND
in_stock: true
reviews_count: 5
category: "Music Nomad"
url: https://www.desertcart.vn/products/605238630-musicnomad-mn850-diamond-coated-safe-zone-guitar-fret-crowning-file
store_origin: VN
region: Vietnam
---

# 240 grit premium diamond coating 0.38 lbs ergonomic weighted handle Patent-pending Safe Zone anti-overfiling MusicNomad MN850 Diamond Coated, Safe Zone Guitar Fret Crowning File (S-File)

**Brand:** musicnomad
**Price:** 5138506₫
**Availability:** ✅ In Stock

## Summary

> 🎸 Crown your frets like a pro — file, skate, and dominate your sound!

## Quick Answers

- **What is this?** MusicNomad MN850 Diamond Coated, Safe Zone Guitar Fret Crowning File (S-File) by musicnomad
- **How much does it cost?** 5138506₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/605238630-musicnomad-mn850-diamond-coated-safe-zone-guitar-fret-crowning-file)

## Best For

- musicnomad enthusiasts

## Why This Product

- Trusted musicnomad brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual-Channel Mastery:** Two perfectly radiused channels for narrow/medium and wide/jumbo frets cover all your guitar needs.
- • **Ergonomic Power Grip:** Heavy, offset silicone handle reduces hand fatigue and provides superior leverage and control.
- • **Cutting-Edge Efficiency:** 240 grit diamond coating cuts in both directions for faster, smoother fret crowning.
- • **Universal Compatibility:** Optimized for Nickel Silver frets on acoustic, electric, bass guitars, banjos, and ukuleles.
- • **Precision Meets Protection:** Patent-pending Safe Zone stops overfiling, ensuring flawless fret crowns every time.

## Overview

The MusicNomad MN850 Safe Zone S-File is a premium diamond-coated fret crowning tool designed with patented anti-overfiling technology, dual-radius channels for all fret sizes, and an ergonomic weighted handle. Engineered for precision and speed, it dramatically reduces the learning curve and hand fatigue, making it the go-to file for professional and enthusiast guitar techs working on Nickel Silver frets across multiple string instruments.

## Description

Say no to black markers, constantly checking and worrying about overfiling, MusicNomad takes fret crowning to the next level with our game-changing Safe Zone "S-File". It starts with our safe zone innovation that has no diamond grit at the top of the arch of the channel, eliminating the chance of overfiling. Our design reduces the fret crowning learning curve from weeks to hours. Our premium 240 diamond grit combined with the ideal filing radius design gives you the perfect cut. The offset design provides both added leverage when filing & allows you to clear the guitar body when filing over it. It works amazing for crowning the most popular fret wire material, Nickel Silver, found on all Acoustic Guitars, Banjos, Ukuleles & most Electric & Bass Guitars. As with any file, using on Stainless Steel fret wire will shorten the file life. The S-File works on all fret sizes, has custom lines for spot crowning, a wide channel that is not too flat, a convenient hang hole, and so much more.

Review: La mejor herramienta para coronar
Review: After 3 refrets with this crowning file, I can recommend it highly. The design of the tool virtually guarantees a very fine crown everytime. With two different sized grooves, it can cover most any size fret and does handle stainless steel frets very well. The one caveat I would add though is for first time users. Make sure you use the correct size for your fret job and always clean your file often to remove any debris that could hinder the workability of the file. Ergonomic and well weighted to allow you to let the tool do the work. Highly recommended

## Features

- A TRUE GAME-CHANGER: Designed by our Sonoma, CA team and in collaboration with top repair techs, the Safe Zone S-File sets a new higher standard for what you should expect when you buy a Fret Crowing File. No detail is overlooked, and it is packed with unmatched features and benefits.
- WHY DID I NOT THINK OF THE SAFE ZONE?: The patent pending Safe Zone innovation prevents you from over filing. At the top of the file, there is a small strip where there are no diamonds. Once you perfectly sculpt and round both sides of the frets, the S-File stops filing and skates on top of the fret. You can hear and feel the difference and it's time to move to the next fret. It's that simple...File-Skate-Go! The premium diamonds make both fast and precision filing. Whether you are a seasoned tech or new to fret crowing it reduces the learning curve from weeks to hours.
- THE PERFECT DIAMOND FILE DESIGN: The 240 grit premium diamond coating is perfectly rounded to closely match the original radius of your frets. One channel is for narrow/medium frets and the other is for wide/jumbo frets. After hearing many repair shops complain the wide side of existing files are too flat to use, we increased the roundness of our wide channel to improve the functionality. Additionally, our diamond file cuts in both directions, speeding up the process, unlike toothed files that cut in only one direction.
- BIG IMPROVEMENT OVER EXISTING HANDLE DESIGNS: Our comfortable, heavy, ergonomic handle design makes such a big difference. It starts with our innovative blue silicone comfort grip that reduces hand fatigue. The offset design provides both added leverage when filing and allows you to clear the guitar body when filing over it. Weight makes a difference. We beefed up our design so the weight of the S-File does the work for you and is in a weight class by itself at .38 lbs (173g). Lastly, the fret size channel application is engraved in the handle so it won't rub off, allowing you to know the correct file size to use. We even include a convenient hang hole.
- ADDITIONAL FEATURES & BENEFITS: It works amazing for crowning the most popular & widely used fret wire material, Nickel Silver, found on all Acoustic Guitars, Banjos, Ukuleles and most Electric & Bass Guitars. As with any file, using on Stainless Steel fret wire will shorten the file life. Stainless Steel is used on a small percentage of Electric and Bass Guitars. Our exclusive nose design features two lines for spot fret crowning. Position the line to be 90 degrees from the frets and you will just be filing right where the line intersects with the fret. Our high quality manufacturing process includes radiused & beveled edges along the entire perimeter.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CS12ZY7C |
| Best Sellers Rank | #81,210 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #75 in Hand Files |
| Body Material | Silicone |
| Color Name | Blue |
| Customer Reviews | 4.7 4.7 out of 5 stars (260) |
| Date First Available | 26 January 2024 |
| Item Weight | 181 g |
| Item model number | MN850 |
| Material Type | Silver |
| Product Dimensions | 22.23 x 3.48 x 0.43 cm; 181 g |

## Images

![MusicNomad MN850 Diamond Coated, Safe Zone Guitar Fret Crowning File (S-File) - Image 1](https://m.media-amazon.com/images/I/61xkuFjWYKL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by E***Z on 26 May 2024*

La mejor herramienta para coronar

### ⭐⭐⭐⭐⭐ Review
*by P***B on 31 October 2025*

After 3 refrets with this crowning file, I can recommend it highly. The design of the tool virtually guarantees a very fine crown everytime. With two different sized grooves, it can cover most any size fret and does handle stainless steel frets very well. The one caveat I would add though is for first time users. Make sure you use the correct size for your fret job and always clean your file often to remove any debris that could hinder the workability of the file. Ergonomic and well weighted to allow you to let the tool do the work. Highly recommended

### ⭐⭐⭐⭐⭐ Review
*by M***N on 15 October 2025*

Super outil qui m'a permis de faire finaliser la planimétrie de ma guitare et donner une seconde jeunesse à ses frettes ! La lime est ergonimique et simple d'utilisation.

## Frequently Bought Together

- MusicNomad MN850 Diamond Coated, Safe Zone Guitar Fret Crowning File & Luthier Tool (S-File)
- MusicNomad Fret Leveler - Leveling (L-Beam) 17.6" (45cm) for Acoustic and Electric Guitars (MN811)
- MusicNomad Tracers Fret Erasers 6 pc. Finishing Kit for Sanding, Buffing and Polishing after Fret Crowning, Dressing or Beveling (MN860)

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-02-07*