What is the Flex-Hone tool?

The Flex-Hone tool is a flexible abrasive cylinder hone used for surface finishing and cross hole deburring.

What types of applications can the Flex-Hone tool be used for?

Successful applications include firearm chambers, shotgun barrels, musical instruments, combustion chambers, air compressors, pumps, valve bodies, valve guides, brake cylinders, wheel cylinders and more.

What sizes and abrasive types are offered for the Flex-Hone tool?

The tool is produced in standard diameters from 4mm to 36 inches, and nine abrasive types are offered including silicon carbide, aluminum oxide, boron carbide and diamond. It is available in a choice of 11 different grit selections.

I have a 3.12 inch bore size, what size hone and grit should I get?

Get the 3.25" or 3.5" hone. Preferably, use the softest grit possible, 250-300.

Which hone do I need for an 87.45mm bore?

You should choose one designed for a 3.5" bore.

What size hone do I need for an 84mm cylinder?

You should look for a 3.5" hone that fits somewhat snug to the bore.

Would a 3 1/4 inch hone be too big for my 77.5mm bore?

No, it will work and do a good job.

Where is the hone made?

It is made in the USA, and works great on engine bores.

What size flex-hone do I need to hone a 4.85 inch bore cyl?

You would need to get a 5" hone.

I’m rebuilding a Chevy 350cid with a 4 inch bore. What size and grit flex hone should I use?

If you are doing a lite hone, 240 is perfect.

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Flex-Hone

Flex-Hone Tool "Brush Research FLEX-HONE Cylinder Hone, GBD Series, Silicon Carbide Abrasive, 5-1/2"" (140 mm) Diameter, 120 Grit Size" (GBD51212)

Name: Flex-Hone Tool "Brush Research FLEX-HONE Cylinder Hone, GBD Series, Silicon Carbide Abrasive, 5-1/2"" (140 mm) Diameter, 120 Grit Size" (GBD51212)
Uploaded: 2025-01-13T17:03:18.939Z
Description: Flex-Hone Tool "Brush Research FLEX-HONE Cylinder Hone, GBD Series, Silicon Carbide Abrasive, 5-1/2"" (140 mm) Diameter, 120 Grit Size" (GBD51212)

Item #:84799814

4.8 rating

Write a review

PKR 43478
Price Detail
Price
PKR 43478
Excluding Shipping & Custom charges
( Shipping and custom charges will be calculated on checkout )
* All items will be imported from US Store

Size :3.000"(76mm)

3.000"(76mm)

3.250"(83mm)

3.500"(89mm)

3.750"(95mm)

4.000"(102mm)

4.250"(108mm)

4.500"(114mm)

5.000"(127mm)

5.500"(140mm)

6.000"(152mm)

6.500"(165mm)

7.000"(178mm)

7.500"(191mm)

8.000"(203mm)

Style :40 Grit

40 Grit

60 Grit

80 Grit

120 Grit

180 Grit

240 Grit

320 Grit

400 Grit

600 Grit

800 Grit

Availability : Out of stock

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Flexible abrasive cylinder hone for surface finishing and cross hole deburring

Product Details

The Flex-Hone Tool is a resilient, flexible honing tool w/ globules of raw grain abrasive in a resin bond.
A perfect solution for many of your finishing, deburring and edge-bending needs. Designed for surface finishing and cross hole deburring in brake cylinders, wheel cylinders, hydraulics, pneumatics and valve guides.
Works in a wide variety of applications in the automotive and industrial fields.
Uses a flexible honing process to provide superior surface finish on any base material. Are unlike any other honing tool because it produces an unmatched controlled surface condition.
Available in a variety of sizes and abrasive types.

Product Dimensions	17.5 x 8 x 5.5 inches (44.5 x 20.3 x 14.0 cm);1.31 pounds (0.59 kg)
Item model number	GBD51212
Date First Available	November 9, 2004
Manufacturer	BRUSH RESEARCH MFG CO
Material	Silicon Carbide
Brand	Flex-Hone
Grit Material	Silicon Carbide
Bristle Type	Abrasive Globule Bonded To Flexible Nylon Filament
Compatible Material	Other Softer Ferrous Materials, Stainless Steel, Mild Steel, Cast Iron
What's in the box	Brush Research Mfg Co Gbd 5-1/2 (140Mm) 120Sc Flex-Hone Gbd51212

Features & Benefits

Originally created to deglaze cylinder walls in automotive applications
Produces an oil holding cross hatch pattern and a true plateau finish
Elimination of peaks results in rapid ring seating, better oil control and reduced seepage
Can be used in any type or size of cylinder, as well as for deburring and edge blending
Self centering, self-aligning, self-compensating for wear
Available in standard diameters from 4mm to 36 inches with a choice of 11 different grit selections

Product Description

Flex-Hone Tool "Brush Research FLEX-HONE Cylinder Hone, GBD Series, Silicon Carbide Abrasive, 5-1/2"" (140 mm) Diameter, 120 Grit Size" (GBD51212)

Overview

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Customer Questions & Answers

Question : What is the Flex-Hone tool?
Answer : The Flex-Hone tool is a flexible abrasive cylinder hone used for surface finishing and cross hole deburring.
Question : What types of applications can the Flex-Hone tool be used for?
Answer : Successful applications include firearm chambers, shotgun barrels, musical instruments, combustion chambers, air compressors, pumps, valve bodies, valve guides, brake cylinders, wheel cylinders and more.
Question : What sizes and abrasive types are offered for the Flex-Hone tool?
Answer : The tool is produced in standard diameters from 4mm to 36 inches, and nine abrasive types are offered including silicon carbide, aluminum oxide, boron carbide and diamond. It is available in a choice of 11 different grit selections.
Question : I have a 3.12 inch bore size, what size hone and grit should I get?
Answer : Get the 3.25" or 3.5" hone. Preferably, use the softest grit possible, 250-300.
Question : Which hone do I need for an 87.45mm bore?
Answer : You should choose one designed for a 3.5" bore.
Question : What size hone do I need for an 84mm cylinder?
Answer : You should look for a 3.5" hone that fits somewhat snug to the bore.
Question : I am doing 95 mm / 3.75 inch cylinders. Should I get the 3.75 or the 4 inch hone?
Answer : You should get the 3.75" hone.
Question : What size hone should I get for a 3.937 in bore?
Answer : The 4" hone would be correct.
Question : Would a 3 1/4 inch hone be too big for my 77.5mm bore?
Answer : No, it will work and do a good job.
Question : Where is the hone made?
Answer : It is made in the USA, and works great on engine bores.
Question : What size flex-hone do I need to hone a 4.85 inch bore cyl?
Answer : You would need to get a 5" hone.
Question : I’m rebuilding a Chevy 350cid with a 4 inch bore. What size and grit flex hone should I use?
Answer : If you are doing a lite hone, 240 is perfect.

Customer Ratings

4.8 out of 5

865 customers ratings

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Flex-Hone Editorial Review

The Brush Research GBD600800 FLEX-HONE® is a highly effective tool for engine rebuilds, specifically for cleaning cylinders and creating a good cross-hatch finish. Customers have found it to be easy to use once they understand the process, with a user suggesting watching instructional videos to get the hang of it. The tool is effective for various bore sizes, with one user successfully using it for a Subaru piston job. Despite one complaint about a part falling off during use, overall, customers have found it to be a good alternative to expensive machine shop services and have praised its performance in providing a nice cross-hatch finish for engine rebuilds. **

Pros

Effective for creating a cross-hatch finish on cylinders
Suitable for various bore sizes
Cost-effective alternative to machine shop services

Cons

Possibility of components falling off during use

Important Information

Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

Flex-Hone Tool "Brush Research FLEX-HONE Cylinder Hone, GBD Series, Silicon Carbide Abrasive, 5-1/2"" (140 mm) Diameter, 120 Grit Size" (GBD51212)

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