4.5 out of 5
Brush Research GB31232 Flex Hone Gb 3-1/2 320Sc, Price/EA
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Product Description
Price is for EA.
- Flex-Hone Tool
- Type Standard Duty
- Capacity 3-1/2 To 3-1/4 Inch (Bore)
- Size 3-1/2 Inch Diameter X 13-1/2 Inch Length
- Applicable Standard Iso 9001
- Abrasive Type Silicon Carbide
- Grit Size 320
- End Marking Color White
- Application Automotive, Military, Aerospace, Marine, General Industrial, Manufacturing, Oil And Gas, Firearm, Musical Instrument, Fluid Power, Hydraulic, Aluminum Extrusion, Earth Moving Equipment
Features / Benefits
- SURFACE FINISHING - The 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 - Debarring 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-cantering 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 debarring pattern
- PLATEAU FINISHING - 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
Part Number: GB31232
UNSPSC: 31191500
Specification
| Order Part Number | BSGB31232 |
| Item Desc | FLEX HONE GB 3-1/2 320SC |
| MANUFACTURER LONG NAME | Brush Research Manufacturing Co., Inc. |
| ADDITIONAL INFORMATION | Abrasive Type Silicon Carbide; Grit Size 320; End Marking Color White; Application Automotive, Military, Aerospace, Marine, General Industrial, Manufacturing, Oil and Gas, Firearm, Musical Instrument, Fluid Power, Hydraulic, Aluminum Extrusion, Earth Moving Equipment |
| MANUFACTURER PART NUMBER | GB31232 |
| Product Group Id | BS01 |
| Country of Origin | US |
| Harmonization Code | 82079000 |
| Bin Code | EN041 |
| Default Selling Unit | EA |
| Product Group Desc | BRUSH RESEARCH |
| PROP 65 WARNING | Yes |
| Catalog Pages(s) | |
| Other Document 1 |
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Product Warranty
Most Air and Power tools have a 90 days to one year warranty. Hand Tools are usually lifetime-abuse voids warranty.
Return Policy
The wearable safety items, like golves, masks, respirators, etc, are non-returnable.
Note
This product is not eligible for coupon code discount, for we've been offering the best price in the market.
Need more information?
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Our staff are available to answer any questions you may have about this item
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Customer Reviews
By Peter Park
Date: December 14, 2025
Used this to deglaze cylinders on a cast iron engine block. Left a nice crosshatch pattern and removed just enough material without overdoing it. Very forgiving and easy to use with a hand drill. Great tool for anyone doing rebuilds at home. Highly recommend.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By tony nelson
Date: November 15, 2025
I used 320 grit for my moly rings
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Jonathan
Date: November 11, 2025
83mm 3/14" works great on a Kohler sv735
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By David Anderson
Date: October 20, 2025
As described
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Gino Catanzarite
Date: October 14, 2025
I used a used a harbor freight 3 stone hone and ran that dry to remove as much material as I could and remove the deep score marks and ridge. I then ordered this BRM 105mm 240 grit hone and ran it with penetrating oil to get my final finish. I am more than pleased by the result! I would highly recommend to any DIY engine builder! This is by far the best finish I have ever seen from a power drill hone job!!!
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Tyler
Date: September 14, 2025
I used it on a rebuild of a FE350 Kawasaki engine. That is in my 1995 club car carry all six. I also bought the hone oil that they recommend. Worked great no complaints.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]