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BRM Flex Hones

BRM Flex Hones

Posted by Sherry Gillis on Jan 28th 2016

BRM Flex Hones

BRM makes a wide variety of flex hones from 3/4 of an inch up to 10 inches. Made in the United States, they are preferred over a stone type cylinder hone because they put even pressure and are much easier to control. For all engine rebuilds and cylinders. The cylinders need to be honed in order for the rings to set. They come in a variety of sizes that depend on the size of your cylinder. These provide a consistent hone.

The BRM Flex Hone Tool produces a controlled surface condition unobtainable by any other method. The process involves finish, geometry and metallurgical structure. A high percentage plateaued surface is produced free of cut, torn and folded metal.

Specifically, the process is a low-temperature, lowpressure abrading system that exposes the undisturbed base metal structure to produce a long wearing surface; one that is metallurgically free of fragmented, amorphous or smeared metal from previous machining operations. A nondirectional or crosshatched pattern is created on the surface that contains valuable valleys between the plateaus for oil retention.

The BRM Flex Hone is a resilient, flexible honing tool with a soft cutting action. It’s unique construction allows the abrasive globules or “stones” to float, assuring the tool will be self-centering, self-aligning to the bore and self-compensating for wear.

Whether your need is cross hole deburring, surface finishing or edge blending there is a Flex- Hone® Tool designed for you. In Automotive, Hydraulic, Pneumatic or Industrial applications, the BRM Flex Hone will provide a superior surface finish bringing increased product performance, longer product life and less product reject.


The BRM Flex Hone Tool is available in a variety of abrasive types and grit selections to provide the optimum surface finish on any base material. The Flex-Hone® is commonly used to reduce Ra, Rk and Rpk values while maintaining Rvk and Vo volume for oil retention. Using the Flex-Hone® Tool for surface finishing allows the sizing tools to do their jobs quickly and accurately without fighting surface finish. The Flex-Hone® is also used in adhesive bonding applications where a rougher surface is desired for bonding integrity.


Deburring of cross drilled holes is an expensive, time consuming operation. The Flex-Hone® Tool can be used to remove burrs from cross drilled holes leaving a clean, radiused intersection. Because of its unique construction, the Flex-Hone® can be used online in machine tool applications or offline as a secondary operation. The tool is self-centering and self-aligning to the bore so elaborate, rigid set-ups are not required. It is advisable to use the tool in the main bore into which the cross holes break. Best results are obtained by rotating and stroking the tool a few strokes in a clockwise direction, removing the tool from the part, reversing the spindle and then rotating and stroking the tool in a counter clockwise direction for a few more strokes. This forward and reverse rotation creates a more symmetrical deburring pattern.


Brush Research pioneered the concept of a plateau finish and is a strong proponent of the benefits of a cross hatch, plateaued finish. The concept involves removing the peaks produced by prior machining operations and creating a substantially flat or plateau finish. A plateau finish created by the elimination of peaks allows rings and seals to seat without damaging their edges. The cross hatch pattern will aid in lubrication control and retention, reduce seepage in hydraulic and pneumatic applications and promote longer seal life.