Brush Research GB312400 FLEX-HONE®, 3-1 2" (89mm) Diameter, 400 Grit, Silicon Carbide, for Mild Steel, Stainless Steel and Cast Iron
  • Brush Research GB312400 FLEX-HONE®, 3-1 2" (89mm) Diameter, 400 Grit, Silicon Carbide, for Mild Steel, Stainless Steel and Cast Iron
  • Brush Research GB312400 FLEX-HONE®, 3-1 2" (89mm) Diameter, 400 Grit, Silicon Carbide, for Mild Steel, Stainless Steel and Cast Iron
Material Silicon Carbide
Brand Flex-Hone
Grit Material Silicon Carbide
Bristle Type Crimped Wire
Color Grey
  • [QUALITY]- Proudly Made in the USA. The FLEX-HONE is long lasting, lowering total cost of use compared to other brush options.
  • [DESIGN]- The FLEX-HONE is manufactured to be self-centering, self-aligning and self-compensating for wear for easy use.
  • [FINISHING BENEFITS]- Offered in a wide variety of grits and abrasives to allow machinists to achieve specific finishing tolerances as well as a beautiful crosshatch finish.
  • [CROSSHOLE DEBURRING]- Ideal for finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle.
  • [SILICON CARBIDE ABRASIVE]- Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials.

Product 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, Z-Grain, Leviagted Alumina, CBN 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.

Product 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, Z-Grain, Leviagted Alumina, CBN 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.

Product details

  • Package Dimensions ‏ : ‎ 13.82 x 5.16 x 5 inches; 14.82 ounces
  • Date First Available ‏ : ‎ April 23, 2023
  • Manufacturer ‏ : ‎ Brush Research Manufacturing
  • ASIN ‏ : ‎ B0C39L833V
  • Best Sellers Rank: #124,011 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
    • #68 in Flex Hones

From the manufacturer

Flex-Hone

Flex-Hone Benefits for Hobbyists, Machinists and High Volume Production Environments

Flex-Hone Finishing

Flex-Hone Crosshole Deburring

Flex-Hone Polishing

Flex-Hone Engine Block

Surface Finishing

Working with machined parts often means ensuring a proper finish. The Flex-Hone creates repeatable finishing results with minimal setup or effort. The tool can be chucked in virtually any rotating spindle.

Crosshole Deburring

Deburring is a costly operation for machinists. Even a small notch can cause moving parts to catch, creating the potential for accident. Deburr and finish cylinders in a single set with Flex-Hone Tools.

Polishing and Single Digit RA Finishing

The Flex-Hone can achieve some of the most difficult finishing challenges with our large selection of grit and abrasive options. Finer grits are capable of achieving single RA finishes with minimal effort.

Consistent Plateaued Crosshatch Finishes

The Flex-Hone can deglaze cylinder walls with ease. A 45 degree crosshatch helps to seat piston rings and retains oil for lubrication. Also great for valve guides, piston pin bores, cam bearing bores and more!

Flex-Hone in Machine

Flex-Hone offers machinists the ideal combination of performance and value for professional finishing applications.

Flex-Hone Sizes
Brush Research Manufacturing's Flex-Hone Tool

For over 60 years, BRM has been a leader in the art and science of surface finishing. BRM invented the Flex-Hone to tackle a variety of surface finishing challenges, whether your need is providing a proper crosshatch on engine cylinders, finishing hydraulic and pneumatic cylinders, deburring cross drilled holes and more.

  • Invented and Made By American Craftsmen
  • Long Lasting to Help Save You Time and Money
  • Remove Repetitive Motion Operations- Works On Virtually Any Rotating Spindle

BRM's Flex-Hone Tool

Finishing and Deburring For Any Type or Size of Cylinder

The Flex-Hone Tool is a resilient, flexible honing tool used to improve the internal surface finish while also being able to deburr a bore or cylinder. It is comprised of abrasive globules laminated onto the ends of flexible nylon filaments. Its unique construction allows the tool to be self-aligning, self-centering and self-compensating for wear.

  • Proudly Made in the USA
  • Offering 10 Different Abrasive Types and 11 Grit Selections
  • Provides a Crosshatch and Plateaued Finish on Engine Cylinders, Valve Guides, Piston Pin Bores and More!
  • Ideal for Crosshole and Slot Deburring
  • Achieve Single Digit RA finishes
Small Diameter Flex-Hone GB GBD Rotors Firearms Flex-Hones Flex-Hone Kits
BC Small Diameter Flex-Hone GB Standard Duty Flex-Hone GBD Heavy Duty Flex-Hone Flex-Hone for Rotors Flex-Hone for Firearms Flex-Hone Kits
For Any Type or Size of Cylinder








Brush Research GB312400 FLEX-HONE®, 3-1 2" (89mm) Diameter, 400 Grit, Silicon Carbide, for Mild Steel, Stainless Steel and Cast Iron

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