---
product_id: 16539777
title: "Brush Research BC23424 FLEX-HONE, 2-3/4\" (69.9mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials"
brand: "flex-hone"
price: "NT$2613"
currency: TWD
in_stock: true
reviews_count: 8
category: "Flex Hone"
url: https://www.desertcart.tw/products/16539777-brush-research-bc23424-flex-hone-2-3-4-69-9mm
store_origin: TW
region: Taiwan
---

# Self-centering & self-aligning design 240 grit silicon carbide for precision finish 2.75" diameter fits 2.626"-2.75" bores Brush Research BC23424 FLEX-HONE, 2-3/4" (69.9mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials

**Brand:** flex-hone
**Price:** NT$2613
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your cylinder finish game with the Flex-Hone — where precision meets effortless perfection!

## Quick Answers

- **What is this?** Brush Research BC23424 FLEX-HONE, 2-3/4" (69.9mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials by flex-hone
- **How much does it cost?** NT$2613 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/16539777-brush-research-bc23424-flex-hone-2-3-4-69-9mm)

## 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:** Works seamlessly with hand drills, drill presses, and CNC machines for professional-grade results.
- • **Trusted American Craftsmanship:** Proudly made in the USA by the original inventors, guaranteeing quality and consistency you can rely on.
- • **Precision Fit for Perfect Finish:** Oversized design ensures optimal pressure and self-centering action for flawless honing every time.
- • **Dual-Action Deburring & Finishing:** Simultaneously deburrs and finishes crossholes, saving time and streamlining your workflow.
- • **Industry-Leading 240 Grit Silicon Carbide:** Delivers a smooth 24-32 microinch finish ideal for mild steel, stainless steel, and cast iron surfaces.

## Overview

The Brush Research BC23424 FLEX-HONE is a 2.75" 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 optimal pressure and a consistent crosshatch finish, ideal for hydraulic, pneumatic, and engine cylinders. Made in the USA, it offers simultaneous deburring and finishing capabilities compatible with various rotating spindles, delivering professional-grade surface preparation and extended seal life.

## 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: Good honer - Worked as it should.
Review: Another awesome product from Flex hone - Product work great for cleaning out lifter bores on small block Chevrolet

## 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 BC Standard Duty FLEX-HONE: 2.750" (69.9mm) Bore Diameter, 3" Abrasive Part Length, 0.245" Shank Diameter, 8" Overall Length. For Use on Bore Diameters Between 2.626"-2.750". PLEASE NOTE: ORDER BY BORE SIZE.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002XUL0SG |
| Best Sellers Rank | #2,882 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Flex Hones |
| Brand | Flex-Hone |
| Brand Name | Flex-Hone |
| Bristle Type | Abrasive Globule Bonded To Flexible Nylon Filament |
| Color | Black |
| Compatible Material | Cast Iron, Mild Steel, Other Softer Ferrous Materials, Stainless Steel |
| Customer Reviews | 4.7 out of 5 stars 2,748 Reviews |
| Grit Material | Silicon Carbide |
| Grit Material Type | Silicon Carbide |
| Grit Type | 240 |
| Included Components | BC 2-3/4" (70MM) 240SC FLEX-HONE |
| Item Height | 3.7 inches |
| Manufacturer | Brush Research Manufacturing |
| Material | Silicon Carbide |
| Material Type | Silicon Carbide |
| Number of Pieces | 1 |
| Recommended Uses For Product | Deburring, Finishing |
| UPC | 843469124791 |
| Unit Count | 1.0 Count |
| Warranty Description | Manufacturer Warranty |

## Product Details

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

## Images

![Brush Research BC23424 FLEX-HONE, 2-3/4" (69.9mm) 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/81-3xGw-8iL.jpg)

## Available Options

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

## Questions & Answers

**Q: Have a 67.40 bore steel sleeve.   What size and grit**
A: For your 67.4mm application with steel sleeve, enter this ASIN number in the amazon search bar: B002N36MOA  this is 240 a 240 grit hone for stock rebuilds. If your application is a high rev engine with Moly or Chrome faced top ring ring-set, then 320 grit is preferred. For the 320 grit version, enter this ASIN in the Amazon search bar:  B002SAMS1E  Plenty in stock for immediate shipment.

**Q: Delivery time for Mexico?**
A: About a week or so.   Our price is for 2pcs, not 1pc.

**Q: Hello all... i am looking for the hone size and grits to hone a wsm platinum series piston  - standard bore 84.00mm   thanks!**
A: 84to88mm fine grit.

**Q: Can this hone be used for chainsaw cylinders? Are these aluminum oxide?**
A: Answer to Question No. 1:  Yes, am SURE that Brush Research Flex-Hones CAN be used to hone chainsaw motor cylinder bores.....We use Flex-Hones for various operations in Our efforts to RE-build & restore 1930's & '40's "Vintage"-style, HIGH-Performance, Ford FlatHead-V8 engines, including:  Our automotive machinist "Hones" cylinders in cast iron ENG blocks w/ Flex Hones, after actual cylinder boring.  We hone lifter bores & valve bowls w/ Flex-Hones, and do final polishing of intake & exhaust runners, valve & exhaust ports, after doing initial "Porting" work with stones & burrs mounted on die-grinders & dremels--work which We do for Ourselves in Our own, private shop.  Have also used Flex-Hones to polish MISC bores, of various sizes, in antique Ford cast iron cylinder heads (e.g.:  Model A & B Distributor Housing ports), AND to polish venturi bores in cast iron bases of antique Ford Stromberg carburetors.....
Answer to Question No. 2:  Brush Research manufactures Flex-Hones w/ abrasive "balls" made of BOTH Aluminum AND Silicon Oxide, in a broad variety of "Grit" ratings/grades.  I would STRONGLY SUGGEST contacting  "Tech-Support" at Brush Research Co., tell a Technician what Your SPECIFIC project application is, type of metal You are working on, etc, Etc, and get THEIR recommendation(s) for either Aluminum Or Silicon Oxide, "Grit" grade to use, and so-on---AGAIN:  Based on YOUR specific job/project application & requirements.  GOOD LUCK & HAPPY NEW Year!!  RLR

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good honer
*by P***D on December 4, 2025*

Worked as it should.

### ⭐⭐⭐⭐⭐ Another awesome product from Flex hone
*by C***R on October 8, 2025*

Product work great for cleaning out lifter bores on small block Chevrolet

### ⭐⭐⭐⭐⭐ Works well
*by O***N on January 5, 2026*

Used on my 2006 ktm 125sx and it worked amazingly, used honing oil and this and my cylinder was good as new!

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-02-09*