---
product_id: 234195847
title: "Brush Research GBD51224 FLEX-HONE®, 5-1/2\" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials"
brand: "flex-hone"
price: "₨81745"
currency: LKR
in_stock: true
reviews_count: 13
category: "Flex Hone"
url: https://www.desertcart.lk/products/234195847-brush-research-gbd51224-flex-hone-5-1-2-140mm-diameter
store_origin: LK
region: Sri Lanka
---

# Self-centering design - Effortless, consistent honing 240 Grit Silicon Carbide - Precision surface finish 5.5" Diameter - Perfect fit for 5.001"-5.5" bores Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials

**Brand:** flex-hone
**Price:** ₨81745
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your engine rebuilds with the ultimate self-aligning honing powerhouse!

## Quick Answers

- **What is this?** Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials by flex-hone
- **How much does it cost?** ₨81745 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/234195847-brush-research-gbd51224-flex-hone-5-1-2-140mm-diameter)

## 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

- • **Self-Centering & Self-Aligning:** Engineered to compensate for wear and maintain consistent contact—no special setup or expertise needed.
- • **Trusted American Craftsmanship:** Proudly made in the USA by the original FLEX-HONE® inventors, guaranteeing quality and reliability you can count on.
- • **Dual-Action Finishing & Deburring:** Simultaneously smooths and deburrs crossholes in one efficient step, compatible with drills, presses, and CNC machines.
- • **Precision Fit for Optimal Performance:** Oversized 5.5" diameter ensures perfect pressure and alignment inside cylinder walls for flawless finishing.
- • **Industry-Leading 240 Grit Silicon Carbide:** Delivers a superior 24-32 microinch plateau finish, ideal for mild steel, stainless steel, and cast iron.

## Overview

The Brush Research GBD51224 FLEX-HONE® is a 5.5" diameter, 240 grit silicon carbide honing tool designed for mild steel, stainless steel, cast iron, and softer ferrous materials. Its oversized, self-centering design ensures consistent, precise plateau finishes and crosshatch patterns that improve oil retention and seal life. Ideal for hydraulic, pneumatic, and engine cylinders, it also deburrs crossholes in a single operation. Made in the USA by the original FLEX-HONE® inventors, this tool offers professional-grade results with minimal setup.

## 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: A Must-Have for Any Engine Builder - 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.
Review: 6.7 Cummins Hone - Quality product from a quality company. No one local to me sold them so I had to source it from desertcart. As always, it shipped quickly. The hone did its job and was the correct size and grit for a 6.7 Cummins bore. According to the chart, it should work with a 5.9 as well. Knowing what i know now, the balls have a lot of give to them so going 1/4-1/2 inch over would probably merit the same result. Money well spent on the job its intended to be used on.

## 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.
- [240 GRIT SILICON CARBIDE ABRASIVE]-Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 24 - 32 Microinch (.6 - .8 Micrometer).
- [WHAT'S INCLUDED]-1 Each of a GBD Heavy Duty FLEX-HONE: 5.500" (140mm) Bore Diameter, 6" Abrasive Part Length, 0.350" Shank Diameter, 17.5" Overall Length. For Use on Bore Diameters Between 5.001"-5.500". PLEASE NOTE: ORDER BY BORE SIZE.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002XUL1PI |
| Best Sellers Rank | #11,651 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Flex Hones |
| Color | black |
| Date First Available | November 9, 2004 |
| Grit Type | 240 |
| Item Diameter | 5.25 Inches |
| Item Weight | 1.31 pounds |
| Item model number | GBD51224 |
| Manufacturer | Brush Research Manufacturing |
| Number of Pieces | 1 |
| Recommended Uses For Product | Deburring, Finishing |
| Set Name | FLEX-HONE® |
| UPC | 013519059841 843469151568 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Flex-Hone
- **Bristle Type:** Abrasive Globule Bonded To Flexible Nylon Filament
- **Grit Material:** Silicon Carbide
- **Material:** Silicon Carbide
- **Product Dimensions:** 17.5"L x 5.5"W

## Images

![Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 1](https://m.media-amazon.com/images/I/41hPkRcmnaL.jpg)
![Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 2](https://m.media-amazon.com/images/I/513sGclDCbL.jpg)
![Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 3](https://m.media-amazon.com/images/I/51FcAst9eLL.jpg)
![Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 4](https://m.media-amazon.com/images/I/51I2zGpRu8L.jpg)
![Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 5](https://m.media-amazon.com/images/I/51cd3+2jIcL.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.

### ⭐⭐⭐⭐⭐ 6.7 Cummins Hone
*by J***. on November 25, 2025*

Quality product from a quality company. No one local to me sold them so I had to source it from Amazon. As always, it shipped quickly. The hone did its job and was the correct size and grit for a 6.7 Cummins bore. According to the chart, it should work with a 5.9 as well. Knowing what i know now, the balls have a lot of give to them so going 1/4-1/2 inch over would probably merit the same result. Money well spent on the job its intended to be used on.

### ⭐⭐⭐⭐⭐ Best hone on the market
*by A***. on November 23, 2025*

These are the best hones money can buy just use them correctly and they will give you great results. I have been using this brand for over 20 years.

## Frequently Bought Together

- Brush Research GBD51224 FLEX-HONE®, 5-1/2" (140mm) Diameter, 240 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-16*