---
product_id: 69339504
title: "Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2\" (89 mm) Diameter, 120 Grit Size"
brand: "brand: flex-hone tool"
price: "€ 111.04"
currency: EUR
in_stock: true
reviews_count: 13
url: https://www.desertcart.nl/products/69339504-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide
store_origin: NL
region: Netherlands
---

# Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size

**Brand:** brand: flex-hone tool
**Price:** € 111.04
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size by brand: flex-hone tool
- **How much does it cost?** € 111.04 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/69339504-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide)

## Best For

- brand: flex-hone tool enthusiasts

## Why This Product

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

## Description

Fits Hole Size:3.5 Inches





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Size:3-1/2"





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Grit Type:120





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Item Length String:13.5 Inches





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Shank Diameter:0.310 Inches





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Maximum Rotational Speed:700 RPM





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Part Number:GB31212




























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

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- Flexible abrasive cylinder hone for surface finishing and cross hole deburring
- Self-centering, self-aligning, self-compensating for wear
- Use by hand or in CNC equipment
- Order by actual bore size, tool produced oversized
- Sizes from 4mm to 36 inches

## Images

![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size - Image 1](https://images-na.ssl-images-amazon.com/images/I/916ERoubI7L.jpg)

## Available Options

This product comes in different **Size, Item Length String, Shank Diameter, Fits Hole Size, Part Number, Grit Type, Maximum Rotational Speed** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    No machine shop? No problem.
  

*by B***I on Reviewed in the United States on August 21, 2017*

I think I spun the tool a little too fast while honing my cylinders, so make sure you go pretty slow when you use it, however the results speak for themselves.

### ⭐⭐⭐⭐⭐ 







  
  
    Great! Used for 1970 BMW R75/5 Cylinders.
  

*by J***6 on Reviewed in the United States on February 23, 2016*

Used to scruff up some crosshatch patterns on my R75/5 rebuild. Used a simple power drill and WD40 as a lubricant.Bike runs great and new rings have seated in well. No smoke or oil consumption.

### ⭐⭐⭐⭐⭐ 







  
  
    Great company and product!
  

*by M***K on Reviewed in the United States on June 7, 2018*

I contacted Brush Research to make sure I was getting the appropriate hone, because the option list is extensive and I wanted to be sure I ordered the correct brush. The staff was very helpful and answered my questions and advised me on the right brush to buy. However the price they told me for buying it direct from them was considerably more than buying from Amazon? So Amazon it was, still their product.I used it with a cordless drill using 5w-30 oil for about 20-40sec.  I think it worked great and the cylinders for my Super Beetle look awesome and are ready to go back together. Cheap fix, saving the time and cost of taking parts to a shop for simple honing.Thanks Brush Research.

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**Shop now:** [https://www.desertcart.nl/products/69339504-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide](https://www.desertcart.nl/products/69339504-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide)

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-10*