---
product_id: 242017899
title: "Brush Research BC5M32 FLEX-HONE®, 0.197\" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials"
brand: "flex-hone"
price: "B/.75"
currency: PAB
in_stock: true
reviews_count: 13
url: https://www.desertcart.com.pa/products/242017899-brush-research-bc5m32-flex-hone-0-197-5mm-diameter-320
store_origin: PA
region: Panama
---

# 320 grit silicon carbide for ultra-smooth finish 0.197" (5mm) precision diameter Self-centering & self-aligning design Brush Research BC5M32 FLEX-HONE®, 0.197" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials

**Brand:** flex-hone
**Price:** B/.75
**Availability:** ✅ In Stock

## Summary

> ✨ Elevate your cylinder finish game with the FLEX-HONE® precision powerhouse! ⚙️

## Quick Answers

- **What is this?** Brush Research BC5M32 FLEX-HONE®, 0.197" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials by flex-hone
- **How much does it cost?** B/.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/242017899-brush-research-bc5m32-flex-hone-0-197-5mm-diameter-320)

## 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

- • **Precision Perfect Fit:** Engineered oversized design ensures optimal pressure and flawless self-centering in 0.188"-0.197" bores.
- • **Dual-Action Efficiency:** Simultaneously deburrs and finishes crossholes in a single setup, compatible with hand drills, drill presses, and CNC machines.
- • **Made in the USA Quality:** Crafted by the original inventors with unmatched consistency and durability you can trust.
- • **Next-Level Surface Finish:** 320 grit silicon carbide abrasive delivers a pristine 18-30 microinch plateau finish for superior oil retention and seal longevity.
- • **Versatile Material Mastery:** Ideal for mild steel, stainless steel, cast iron, and softer ferrous metals—one tool, endless applications.

## Overview

The Brush Research BC5M32 FLEX-HONE® is a 0.197" (5mm) diameter honing tool featuring 320 grit silicon carbide abrasive designed for mild steel, stainless steel, cast iron, and softer ferrous materials. Its engineered oversized, self-centering design ensures optimal pressure and a consistent plateau finish, improving oil retention and seal life. Made in the USA by the original inventors, it efficiently deburrs and finishes in one step, compatible with various rotating spindles for versatile industrial and automotive applications.

## 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.

## 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.
- [320 GRIT SILICON CARBIDE ABRASIVE]-Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 18 - 30 Microinch (.5 - .7 Micrometer).
- [WHAT'S INCLUDED]-1 Each of a BC Standard Duty FLEX-HONE: 0.197" (5mm) Bore Diameter, 1.50" Abrasive Part Length, 0.083" Shank Diameter, 8" Overall Length. For Use on Bore Diameters Between 0.188"-0.197". PLEASE NOTE: ORDER BY BORE SIZE.

## Product Details

- **Material:** Silicon Carbide
- **Brand:** Flex-Hone
- **Grit Material:** Silicon Carbide
- **Bristle Type:** Abrasive Globule Bonded To Flexible Nylon Filament
- **Product Dimensions:** 8"L x 0.08"W

## Images

![Brush Research BC5M32 FLEX-HONE®, 0.197" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials - Image 1](https://m.media-amazon.com/images/I/71-Qn8wRr4L.jpg)
![Brush Research BC5M32 FLEX-HONE®, 0.197" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials - Image 2](https://m.media-amazon.com/images/I/71354jQE1YL.jpg)
![Brush Research BC5M32 FLEX-HONE®, 0.197" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials - Image 3](https://m.media-amazon.com/images/I/71EZRkPmdaL.jpg)
![Brush Research BC5M32 FLEX-HONE®, 0.197" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer Ferrous Materials - Image 4](https://m.media-amazon.com/images/I/81aPGQTXemL.jpg)
![Brush Research BC5M32 FLEX-HONE®, 0.197" (5mm) Diameter, 320 Grit, Silicon Carbide, For Mild Steel, Stainless Steel, Cast Iron and Softer 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

### ⭐⭐⭐⭐⭐ 







  
  
    One of my favorite engine rebuild tools!
  

*by T***. on Reviewed in the United States on June 1, 2016*

This worked great for honing my 1972 Honda CB350F cylinders. Easy for first timers and cleans up all of the dark spots where the piston rings were stuck and sat for decades. I used a hand drill but you can also use a drill press if you have one. One great tip is to have the drill on at a low speed while you slide the hone tool in and out very swift motion. This will give it the perfect 45° cross hatching, otherwise you may get a more acute angle of cross hatching. Don't forget to use lubrication as well, I used Marvel Mystery oil which worked great.

### ⭐⭐⭐⭐⭐ 







  
  
    Easy to use and very effective
  

*by D***T on Reviewed in the United States on February 24, 2016*

Easiest hone in the world to use.  It should be within 1/8" of your bore size (LARGER, not smaller).  If you're used to flat stone hones, bear in mind that this hone must be TURNING when you insert it in the bore. Will deglaze any cylinder, even if it worn unevenly.  Even works on 2-cycle cylinders, but remember it must be within 1/8" of your bore size or the stones will catch on the ports, fracture, and otherwise misbehave.  A bonus for 2-cycle cylinders is it puts a nice little radius on the edge of the ports, eliminating the step of breaking the edge.

### ⭐⭐⭐⭐⭐ 







  
  
    Did exactly what I wanted
  

*by O***N on Reviewed in the United States on August 12, 2019*

I used this to clean up a hole used for an outboard motor travel pin that had seized. It cleaned out all the corrosion and gave me a nice clean hole in which to insert the bearing sleeve with around ten passes. Very important to get exactly the right size though. I chose one just a smidgen larger than the hole diameter.

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*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-02-07*