Brush Research GBD40024 FLEX-HONE, 4 (101mm) Diameter, 240 Grit, Silicon Carbide Abrasive (Pack of 1)

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$49.37

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(30000 available )

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100 Ratings
90
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Reviews
  • Murl Kuhic

    > 3 day

    We needed this tool for rebuilding motors. Worked great.

  • robin cupi

    06-06-2025

    Perfect

  • J. Robb

    > 3 day

    I have a 2005 Honda CRV that was burning one quart of oil per tank of gas. YES you did read that correctly. Car was abused before I got it, but now I have to fix it. Pulled the engine apart and found scoring on the #4 cylinder wall and a damaged piston. Replaced all 4 pistons, rings, and rod bearings. Took this hone to all the cylinder walls with a little extra in #4. All the bores came out factory perfect, except #4 which I would give a 8 out of 10. You could still see some vertical lines but it was 95% better than before. Hondas stance is do not hone, just install rings, and if you can catch a scratch with your fingernail, the block needs replacement. Well I wasnt replacing my block, so this was the next best thing. Put it all back together and the engine runs perfect. Car does not burn a drop of oil and the oil is still golden. It would be black from blowby within 500 miles before. Very pleased! and highly recommended.

  • Ab6

    > 3 day

    Spec was crosshatch 30 to 45 degrees. Profiled the wet sleeves first, they were all in spec, so went to town. Low speed drill, brisk in out action achieves great results. Lubricate the hone before every use. Go a little past the return direction so you reduce the low angles at the end of the stroke.

  • angel

    Greater than one week

    Excellent product will recommend to everybody

  • Nick Kay

    > 3 day

    Yes

  • Dan

    > 3 day

    Good tool. Worked well.

  • BlueBird

    > 3 day

    Hubby says this is a great tool in his engine rebuild.

  • Colin

    > 3 day

    Works as described. Super tight fit. Works best with someone to hold the block youre working with.

  • Marlee Heller

    > 3 day

    Worked great for honing a Ford 289 .030 over. If using an electric drill, swap batteries after the first bank.

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.

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