Brush Research FLEX-HONE Cylinder Hone, BC Series, Silicon Carbide Abrasive, 3 (76 mm) Diameter, 240 Grit Size

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$6.78

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Reviews
  • Michael E Stora

    06-06-2025

    If you are only a tiny bit over the nominal size do not follow the instructions and go up one size. They are oversized to begin with (my 1 1/8 hone being a few thousandths shy of 1 1/4). I bought a 1 1/8 hone to remove the seam from 1 SCH40 pipe and open it up from 1.03 to 1.06 so that 3/4 pipe will telescope in structural applications. I also intended to use it to open up 25mm aluminum C-cell flashlight tubes to fit 26mm LiFePO4 cells (1.026). I am hoping that after breaking in the hone on the steel pipe I will be able to start it in the aluminum tube without damaging the end. I think in both cases I would have been better served in not following the instructions and buying the 1 hone instead.

  • Björn Turesson

    > 3 day

    I use it for cleaning up a ported cylinder

  • Tom

    > 3 day

    I have personally relied on products from this company for a very long time in a professional setting. As far as ball Hones go Flex-Hone is the best and has been. The quality is top notch and the number of sizes they make are unequalled by any other company

  • Quualudes

    > 3 day

    So I have this 1982 Honda Magna I recently acquired which needs some love to get back on the road. Apparently the previous owner dropped the bike while loading it on a trailer, decided not to fix it and let it sit for a few years. The sight glass was busted on the clutch master cylinder so the fluids drained out of the main chamber and after a few years of sitting, the rest of the fluid turned into some kind of green alien substance... After stripping some screws trying to get the thing took apart, I discovered the piston was quite stuck in the chamber - which required me to drill through the top of the piston, insert a metal screw and pry the b***h out with a crowbar. What I found in the chamber was nothing short of horrific - a nice thick black coating of whatever the brake fluid turned into after all these years. It looked like carbon, and it was impossible to get scrubbed out with brass bore cleaners or soaked out with anything I had available (which is a lot of stuff). I searched around for potential replacements on eBay, but there was nothing that looked like it would be a sure buy that would work - especially for the money these people were asking. So, I have to make this work... Eventually I gave up on the fruitless manual labor and tried to find another solution. Stumbled across honing engine cylinder and started looking for really small honing tools (5/8 or 16 mm). Found this, got it today, attached it to my drill, doused the cylinder and this tool with brake fluid for lubrication and let it go to work.... Freaking awesome results!!!! I got the 120 grit one, so once I get the OEM rebuild kit here, I will do a test fit and if things look snug, I will get the 320 grit brush and finish it up. Very happy to finally be able to move past the roadblock and get onto other stuff on this bike!!!

  • RICHARD OBRIEN

    > 3 day

    Wow, I didnt know how great a tool this was! Perfect honing and amazing product engineering.

  • Hollywood

    > 3 day

    Exactly what you need to prep a new Nikasil cylinder for new rings. This will remove material quickly, which is what you need to set in a nice hash pattern in Nikasil. However, you only need a slow speed (low gear on most drills) and only 3 or 4 oscillating strokes. Good luck.

  • timewilltell

    > 3 day

    Tried using a hone on a motorcycle bore but it was going to be slow going. Used the Flexhone and it did a beautiful job of crosshatching the glaze. Had to be careful as it was a bit aggressive but did the job so quickly it was a real pleasure to use.

  • carpenter

    > 3 day

    These are very easy to use Time will tell how long they last

  • Brian Smith

    > 3 day

    This was exactly what I needed at a VERY affordable price. Came in 3 days!! Wicked F A S T shipping!!

  • Mr. Fix-it Customer

    > 3 day

    Worked great for what I needed, it is important to know how to use this tool before you try to use it. And it’s suggest using 10W-30, I saw some use transmission fluid, I actually used vegetable oil with great results.

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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