---
product_id: 16539779
title: "Brush Research BC34240AO FLEX-HONE®, 3/4\" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials"
brand: "flex-hone"
price: "¥8920"
currency: JPY
in_stock: true
reviews_count: 9
url: https://www.desertcart.jp/products/16539779-brush-research-bc34240ao-flex-hone-3-4-19mm-diameter-240
store_origin: JP
region: Japan
---

# Self-centering design 240 grit precision Made in USA Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials

**Brand:** flex-hone
**Price:** ¥8920
**Availability:** ✅ In Stock

## Summary

> 🔩 Elevate Your Finishing Game with the FLEX-HONE!

## Quick Answers

- **What is this?** Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials by flex-hone
- **How much does it cost?** ¥8920 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/16539779-brush-research-bc34240ao-flex-hone-3-4-19mm-diameter-240)

## 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

- • **User-Friendly Design:** Oversized for easy handling and consistent results every time.
- • **Precision Engineering:** Experience self-centering and self-aligning technology for effortless use.
- • **Versatile Applications:** Perfect for finishing and deburring across a range of non-ferrous materials.
- • **Quality Finish Guaranteed:** Achieve a stunning crosshatch finish with optimal grit selection.
- • **Comprehensive Compatibility:** Works seamlessly with hand drills, drill presses, and CNC equipment.

## Overview

The Brush Research BC34240AO FLEX-HONE is a high-quality honing tool designed for precision finishing of aluminum, brass, bronze, and softer non-ferrous materials. Made in the USA, this 240 grit aluminum oxide hone features a self-centering design and is compatible with various rotating spindles, making it ideal for a wide range of applications including hydraulic and pneumatic cylinders.

## Description

Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials

## 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 ALUMINUM OXIDE ABRASIVE]-Excellent on Aluminum, Brass, Bronze, and softer non-ferrous materials. 240 AO is commonly used for deglazing Nikasil cylinders. Typically achieves a finish of 24 - 32 Microinch (.6 - .8 Micrometer).
- [WHAT'S INCLUDED]-1 Each of a BC Standard Duty FLEX-HONE: 0.750"(19.1mm) Bore Diameter, 2.50" Abrasive Part Length, 0.190" Shank Diameter, 8" Overall Length. For Use on Bore Diameters Between 0.710"-0.750". PLEASE NOTE: ORDER BY BORE SIZE.

## Images

![Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 1](https://m.media-amazon.com/images/I/71WouicrkVL.jpg)
![Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 2](https://m.media-amazon.com/images/I/71N1zlgY7DL.jpg)
![Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 3](https://m.media-amazon.com/images/I/71EZRkPmdaL.jpg)
![Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 4](https://m.media-amazon.com/images/I/81aPGQTXemL.jpg)
![Brush Research BC34240AO FLEX-HONE®, 3/4" (19mm) Diameter, 240 Grit, Aluminum Oxide, For Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 5](https://m.media-amazon.com/images/I/81X4pgWlJtL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Mandatory tool for proper Nickasil cylinder prep when replacing pistons and rings
  

*by K***O on Reviewed in the United States on May 16, 2024*

I decided to rebuild my snowmobile motors as preventative maintenance, and was replacing pistons and rings. The piston suppliers all recommend cylinder prep with these type of ball hones. I bought two hones, one for my 500 cc sleds and one for my 800 cc sled. There are many grits and compounds available, but for Nickasil cylinders these 320 grit Aluminum Oxide versions are recommended. They worked perfectly for de-glazing and refreshing the crosshatch to help in proper cylinder oiling and piston and ring break-in. Choose the ball hone size you need based on the actual cylinder bore diameter. If you buy the hone that matches your diameter it is actually slightly oversized to create just the right amount of pressure to the cylinder wall for effective honing. Using these ball hones takes a bit of technique, but in a home shop environment I found doing the honing in a 5 gallon bucket worked to contain the lube oil from flinging all over the shop, I also made a short spacer to place under the bottom of the cylinder edge inside the bucket to lift the cylinder just enough off the bottom to allow the hone to effectively reach through the cylinder with a full stroke, but not protrude too far through and allow the balls to wrap the lip and bind. Holding the cylinder solid in the bucket also helped to keep the hone centered within the cylinder as cocking it at any angle while holding the cylinder by hand tended to end up with the hone hooking a port or the lip and stopping the process (my first attempts were a bit of a learning curve). Once I figured out how to hold the cylinder and limit the travel properly the remaining cylinders were easy to complete. If you do bind the hone and twist some of the ball fingers, they are very forgiving, and easy to re-set the fingers, straighten them out, and continue on, being more careful about your process. These hones should last forever if you're only using them periodically in a home shop. Using them per the included instructions left a beautiful surface with correctly angled cross-hatch, and made for a perfect top-end rebuild. These are far better than the old spring loaded stone-hones of old, especially for nickasil. These also have a far less likelihood of catching a port if you keep it centered. And if it does catch one due to your (My) own mistakes, it will simply bend around itself but not cause any damage, unlike the potential damage that could be caused if a stone catches a port with the old style hones. Highly recommend this product and the seller.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    10/10 worth every penny
  

*by M***T on Reviewed in the United States on February 11, 2024*

I uploaded a before/after picture. I’ll let that speak for itself.Also, this works wonders on nikasil without removing the material. Borer size is identical before and after honing. Do it!

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Home
  

*by A***S on Reviewed in the United States on January 11, 2024*

It done a really great job honing my chainsaw cylinder. Good product.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-04*