---
product_id: 141736385
title: "Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2\" (89 mm) Diameter, 120 Grit Size"
brand: "flex-hone"
price: "€ 115.93"
currency: EUR
in_stock: true
reviews_count: 6
category: "Flex Hone"
url: https://www.desertcart.it/products/141736385-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide
store_origin: IT
region: Italy
---

# 120 grit silicon carbide abrasive Self-centering & self-aligning 3.5" diameter precision fit Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size

**Brand:** flex-hone
**Price:** € 115.93
**Availability:** ✅ In Stock

## Summary

> 🔩 Hone your edge, own the finish.

## 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 flex-hone
- **How much does it cost?** € 115.93 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/141736385-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide)

## 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

- • **Smart Self-Adjusting Design:** Self-centering, self-aligning, and self-compensating for wear—no special setup needed.
- • **Universal Fit for Any Bore Size:** From 4mm to 36 inches, tailor your honing with exact sizing for perfect results every time.
- • **Versatile Application Powerhouse:** Ideal for automotive cylinders, firearms, pumps, and more—deburr and finish in one go.
- • **Proven Industry Standard Since 1972:** Trusted by professionals worldwide for rapid ring seating and superior surface conditioning.
- • **Effortless Precision Surface Finishing:** Achieve a flawless plateau finish that boosts oil retention and extends seal life.

## Overview

The Brush Research FLEX-HONE GB Series is a 3.5-inch diameter silicon carbide abrasive cylinder hone with 120 grit size, designed for precision surface finishing and cross-hole deburring. Its flexible, self-centering design ensures consistent plateau finishes that improve oil retention and seal performance across a wide range of bore sizes (4mm to 36 inches). Perfect for automotive, industrial, and specialty applications, this tool simplifies honing with no special training required.

## 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.

Review: Flexi-Hone 3.5” - Did a great job, really easy to use
Review: Needed this to refresh some bores that were bored out oversized and had oiling consumption issues. I Ordered new rings and wanted to refresh the cross-hatch. as seen in first image of the bore, the machining marks are visible however the cross hatch isn't except for at the top where the crown sits and the rings don't ride on the cylinder walls. I used two Flex Hones to achieve the desired result, a somewhat course one & then a finer one for the finish. Hopefully the rings will Bedd themselves in nicely and have good oil retention. This is on a Toyota 2JZ 6 Cylinder Engine with an overbore of 86.5mm

## Features

- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002XUL1DK |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 132,640 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 64 in Flex Hones |
| Customer Reviews | 4.2 4.2 out of 5 stars (45) |
| Cutting Diameter | 3.5 Inches |
| Date First Available | 8 Feb. 2010 |
| Grit Number | 120 |
| Included components | GB 3-1/2" (89MM) 120SC FLEX-HONE |
| Item Package Quantity | 1 |
| Item Weight | 322 g |
| Item diameter | 3.5 Inches |
| Item model number | GB31212 |
| Manufacturer | Brush Research Mfg. |
| Measurement System | Inch |
| Number of pieces | 1 |
| Part number | GB31212 |
| Recommended uses for product | Deburring, Finishing |
| Size | 3-1/2\ |
| Style | 120 GRIT |
| UPC | 843469142832 |
| Unit count | 1.0 Count |

## Product Details

- **Brand:** Flex-Hone
- **Bristle type:** Crimped Wire
- **Grit material:** Silicon Carbide
- **Grit type:** 120
- **Material:** Silicon Carbide

## Images

![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size - Image 1](https://m.media-amazon.com/images/I/31-v9YgDrIL.jpg)
![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size - Image 2](https://m.media-amazon.com/images/I/41sZRrnoWHL.jpg)
![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size - Image 3](https://m.media-amazon.com/images/I/513sGclDCbL.jpg)
![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size - Image 4](https://m.media-amazon.com/images/I/51FcAst9eLL.jpg)
![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 120 Grit Size - Image 5](https://m.media-amazon.com/images/I/51I2zGpRu8L.jpg)

## Questions & Answers

**Q: Wish one is best for a cylinder wall that is 75mm (2.95 inch) ?**
A: For the cylinder wall bore size of 2.95", the 3" Flex-Hone is the correct choice., Enter this ASIN # B002N3AA2A  in the Amazon search bar for the correct hone.

**Q: Hello, my cylinder bore is 3 1/8" what size tool do i need to purchase thank you.**
A: For a 3.125" bore,  your application will require the 3-1/4" (3.250") diameter Flex-hone. The 3-1/4" will work perfectly in the 3-1/8" bore as the 3-1/4" Flex-hones working range is down to 3.000". Thank you for the inquiry.

**Q: Can i use this to hone out an old cast iron pipe?  it's about 3 3/4" now and i want it at 4" id. thanks**
A: This hone is not coarse enough to remove that much material. It would take forever and the hone would wear out first. You would need a lathe to remove that amount of thickness.

**Q: I see that it says tool is oversized. For a cylinder bore of 3.66, should I be getting the 3.75 or the 3.50 model?**
A: 1I bought a 4.50 and used it on a 3.55 bore with no problem I  didn't hone as much as instruction said for large bore, hatch marks were beautiful  so go bigger and you can use it over a broad area of bores.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Flexi-Hone 3.5”
*by A***R on 19 November 2019*

Did a great job, really easy to use

### ⭐⭐⭐⭐⭐ Review
*by B***S on 25 August 2024*

Needed this to refresh some bores that were bored out oversized and had oiling consumption issues. I Ordered new rings and wanted to refresh the cross-hatch. as seen in first image of the bore, the machining marks are visible however the cross hatch isn't except for at the top where the crown sits and the rings don't ride on the cylinder walls. I used two Flex Hones to achieve the desired result, a somewhat course one & then a finer one for the finish. Hopefully the rings will Bedd themselves in nicely and have good oil retention. This is on a Toyota 2JZ 6 Cylinder Engine with an overbore of 86.5mm

### ⭐⭐⭐ Review
*by T***. on 23 August 2023*

Be careful when using this. I was sent a product that was larger than what I needed (and had ordered) and I failed to notice until it was too late.

## Frequently Bought Together

- Brush Research GB31212 FLEX-HONE®, 3-1/2" (89mm) 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

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-01-28*