---
product_id: 439412387
title: "Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2\" (89 mm) Diameter, 240 Grit Size"
brand: "flex-hone"
price: "¥43716"
currency: JPY
in_stock: true
reviews_count: 5
category: "Flex Hone"
url: https://www.desertcart.jp/products/439412387-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide
store_origin: JP
region: Japan
---

# 240 grit precision Self-centering design CNC compatible Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size

**Brand:** flex-hone
**Price:** ¥43716
**Availability:** ✅ In Stock

## Summary

> 🔍 Hone your skills with precision!

## Quick Answers

- **What is this?** Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size by flex-hone
- **How much does it cost?** ¥43716 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/439412387-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

- • **Versatile Use:** Perfect for hand use or CNC equipment, adapting to your workflow seamlessly.
- • **Precision Finishing:** Achieve flawless surfaces with our 240 grit silicon carbide abrasive.
- • **Wide Range of Sizes:** Available for bores from 4mm to 36 inches, tailored to your specific needs.
- • **Lightweight & Durable:** Weighing only 308g, this hone is easy to handle without compromising on strength.
- • **Self-Aligning Technology:** Experience effortless operation with self-centering and self-compensating features.

## Overview

The Brush Research FLEX-HONE Cylinder Hone is a flexible abrasive tool designed for surface finishing and cross hole deburring. With a diameter of 3-1/2 inches and a 240 grit size, it offers self-centering and self-aligning capabilities, making it ideal for both manual and CNC applications. This hone is available in various sizes, ensuring a perfect fit for your specific bore requirements.

## Description

Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size : desertcart.in: Industrial & Scientific

Review: Worked well
Review: Quick ship and decent quality.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002XUL1EE |
| Are batteries included? | No |
| Country of Origin | USA |
| Customer Reviews | 4.8 4.8 out of 5 stars (373) |
| Date First Available | 13 March 2013 |
| Item Diameter | 3.5 Inches |
| Item Weight | 308 g |
| Item model number | GB31224 |
| Manufacturer | Brush Research Mfg. |
| Model number | GB31224 |
| Net Quantity | 1.0 Count |
| Number of Pieces | 1 |

## Product Details

- **Brand:** Flex-Hone
- **Bristle Type:** Flexible nylon filament with abrasive globules
- **Grit Material:** Silicon Carbide
- **Grit Type:** Very Fine
- **Net Quantity:** 1.0 Count

## Images

![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size - Image 1](https://m.media-amazon.com/images/I/31CInSrEVDL.jpg)
![Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 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, 240 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, 240 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, 240 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

### ⭐⭐⭐⭐⭐ Review
*by J***M on 23 November 2025*

Worked well

### ⭐⭐⭐⭐⭐ Review
*by J***H on 30 August 2019*

Quick ship and decent quality.

### ⭐⭐⭐⭐⭐ Review
*by R***B on 4 December 2025*

Thought I would have to take the block to a machine shop, but I'm very pleased with how it turned out. Used this with the Flex-Hone oil and the N55B30 engine cylinders don't have any more rust, are nice and sparkly clean with a beautiful cross-hatch. Great product.

## Frequently Bought Together

- Brush Research GB31224 FLEX-HONE®, 3-1/2" (89mm) 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.jp/products/439412387-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide](https://www.desertcart.jp/products/439412387-brush-research-flex-hone-cylinder-hone-gb-series-silicon-carbide)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-23*