---
product_id: 225549083
title: "Brush Research GBD50012 FLEX-HONE®, 5\" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials"
brand: "flex-hone"
price: "€ 177.60"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.nl/products/225549083-brush-research-gbd50012-flex-hone-5-127mm-diameter-120-grit
store_origin: NL
region: Netherlands
---

# Self-Centering & Self-Aligning Design 120 Grit Silicon Carbide Abrasive 5" Diameter Precision Fit Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials

**Brand:** flex-hone
**Price:** € 177.60
**Availability:** ✅ In Stock

## Summary

> 🔧 Elevate your cylinder finish game — precision honing that works as hard as you do!

## Quick Answers

- **What is this?** Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials by flex-hone
- **How much does it cost?** € 177.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/225549083-brush-research-gbd50012-flex-hone-5-127mm-diameter-120-grit)

## Best For

- flex-hone enthusiasts

## Why This Product

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

## Key Features

- • **Versatile Compatibility:** Fits bore diameters from 4.5" to 5", compatible with hand drills, drill presses, and CNC machines.
- • **Premium 120 Grit Silicon Carbide:** Delivers a superior plateau finish on mild steel, stainless steel, cast iron, and softer ferrous metals.
- • **Dual-Action Finishing & Deburring:** Simultaneously smooths and deburrs crossholes, saving time and boosting efficiency.
- • **Made in the USA with Trusted Quality:** Invented and crafted by Brush Research Manufacturing, the pioneers of FLEX-HONE® technology.
- • **Engineered Oversize for Perfect Pressure:** Self-centers and compensates for wear, ensuring flawless cylinder wall contact every time.

## Overview

The Brush Research GBD50012 FLEX-HONE® is a 5" diameter, 120 grit silicon carbide honing tool designed for mild steel, stainless steel, cast iron, and softer ferrous materials. Its oversized, self-centering design ensures optimal pressure and consistent finishes, producing a superior oil-retentive crosshatch pattern ideal for hydraulic, pneumatic, and engine cylinders. Made in the USA by the original FLEX-HONE® inventors, it combines finishing and deburring in one efficient step, compatible with various rotating spindles for professional-grade results.

## Description

The FLEX-HONE® tool was originally created by Brush Research Manufacturing to deglaze cylinder walls in automotive applications. Brush Research embraced the benefits of a plateau finish and pioneered the concept of plateau honing culminating in the introduction of the FLEX-HONE® tool in 1972. The FLEX-HONE® has gained many nicknames over the years and including ball hone, ball style hone, flexihone, dingleberry hone, bead brush, glaze breaker and glaze buster. Flexible honing with the FLEX-HONE® tool produces an oil holding cross hatch pattern and a true plateau finish free of cut, torn and folded metal. Any type or size of cylinder can benefit from the FLEX-HONE®. These abrasive bead style brushes are produced in standard diameters from 4mm to 36 inches. Nine abrasive types are offered including Silicon Carbide, Aluminum Oxide, Boron Carbide and Diamond allowing the tool to be tailored to finish any base material. A choice of 11 different grit selections are available for precise control of finish parameters. The elimination of peaks results in rapid ring seating, better oil control, reduced seepage in hydraulic and pneumatic applications and provides better seal performance and longer seal life. Successful applications include firearm chambers, shotgun barrels, musical instruments, combustion chambers, air compressors, pumps, valve bodies, valve guides, brake cylinders, wheel cylinders and the list goes on and on. FLEX-HONE® tools are also very effective for deburring cross drilled holes, port radiusing and edge blending. Because of its unique construction, the FLEX-HONE® is self-centering, self-aligning, and self-compensating for wear so it does not require an elaborate set-up or special training. Deburring can be effectively automated and combined in the machining process to allow a complete cylinder finish in one operation or it can be employed as a secondary operation with equal results.

## Features

- [QUALITY]-Proudly Made in the USA. Quality and consistency you can count on made from the inventors and makers of the tool.
- [DESIGN]-The FLEX-HONE is intentionally manufactured oversized. This engineered oversize creates the optimal amount of pressure inside the cylinder wall allowing the tool to be self-centering, self-aligning and self-compensating for wear and easy use.
- [FINISHING BENEFITS]-Offered in a wide variety of grits to achieve specific finishing tolerances as well as a beautiful crosshatch finish. Ideal for rebuilding hydraulic and pneumatic cylinders, engine and brake cylinders, valve guides, pumps, compressors and more.
- [CROSSHOLE DEBURRING]-Accomplish finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle from a hand drill, drill press or CNC equipment.
- [120 GRIT SILICON CARBIDE ABRASIVE]-Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 35 - 50 Microinch (.9 - 1.4 Micrometer).
- [WHAT'S INCLUDED]-1 Each of a GBD Heavy Duty FLEX-HONE: 5.000" (127mm) Bore Diameter, 6" Abrasive Part Length, 0.350" Shank Diameter, 17.5" Overall Length. For Use on Bore Diameters Between 4.501"-5.000". PLEASE NOTE: ORDER BY BORE SIZE.

## Product Details

- **Material:** Silicon Carbide
- **Brand:** Flex-Hone
- **Grit Material:** Stainless Steel
- **Bristle Type:** Abrasive Globule Bonded To Flexible Nylon Filament
- **Color:** Gray

## Images

![Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 1](https://m.media-amazon.com/images/I/81Kockd858L.jpg)
![Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 2](https://m.media-amazon.com/images/I/71LI+vNqxIL.jpg)
![Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 3](https://m.media-amazon.com/images/I/81aPGQTXemL.jpg)
![Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 4](https://m.media-amazon.com/images/I/81X4pgWlJtL.jpg)
![Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 5](https://m.media-amazon.com/images/I/818LHwvHsyL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ A Must-Have for Any Engine Builder
*by S***H on May 30, 2025*

I recently used the Brush Research GBD40024 FLEX-HONE® (4”) while freshening up the cylinders on a small block Chevy 350, and I’ve got to say—this tool impressed me.Right out of the box, it felt solid and well-made. I chucked it into a cordless drill, added some honing oil, and gave each bore about 5–10 seconds of low-speed rotation. The crosshatch pattern it left was textbook perfect—clean, consistent, and exactly what you want before dropping in new rings.What I really appreciated was how forgiving it is, even if you’re not a pro machinist. It centers itself well and doesn’t gouge or chatter. It’s one of those tools that gives you great results without needing a bunch of setup or precision tooling.One heads-up: it’s not cheap, but the quality and time it saves make it absolutely worth the price. If you’re rebuilding an engine or refreshing an old bore, this hone is a no-brainer.

### ⭐⭐⭐⭐⭐ Great hone
*by K***K on July 2, 2025*

Works good. Used on a 07 chevy 5.3L flawless & good quality

### ⭐⭐⭐⭐⭐ Good Tool for a quick hone
*by M***L on February 12, 2025*

Really good tool, used on a 6.0 LS block and a 6.2 LT worked perfectly

## Frequently Bought Together

- Brush Research GBD50012 FLEX-HONE®, 5" (127mm) Diameter, 120 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials
- Brush Research FHQ FLEX-HONE® Oil, Specially Formulated Honing Oil, 1 Quart Bottle (32 fl oz)
- Permatex 81950 Ultra Slick Engine Assembly Lube, 4 oz. , Red

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.nl/products/225549083-brush-research-gbd50012-flex-hone-5-127mm-diameter-120-grit](https://www.desertcart.nl/products/225549083-brush-research-gbd50012-flex-hone-5-127mm-diameter-120-grit)

---

*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-24*