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⚙️ Elevate your cylinder finish game—precision honing that means business!
The Brush Research GB31212 FLEX-HONE® is a 3.5-inch diameter, 120 grit silicon carbide honing tool designed for mild steel, stainless steel, cast iron, and softer ferrous materials. Its engineered oversize design ensures self-centering, self-aligning, and self-compensating action for optimal pressure and finish quality. Perfect for rebuilding hydraulic, pneumatic, engine, and brake cylinders, it simultaneously deburrs and finishes with a distinctive oil-retentive crosshatch pattern. Made in the USA by the original FLEX-HONE® inventors, this tool delivers consistent, professional-grade results with minimal setup.
| ASIN | B002XUL1DK |
| Best Sellers Rank | #10,436 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Flex Hones |
| Brand | Flex-Hone |
| Brand Name | Flex-Hone |
| Bristle Type | Abrasive Globule Bonded To Flexible Nylon Filament |
| Compatible Material | Other Softer Ferrous Materials, Stainless Steel, Mild Steel, Cast Iron |
| Customer Reviews | 4.7 out of 5 stars 160 Reviews |
| Grit Material | Silicon Carbide |
| Grit Material Type | Silicon Carbide |
| Grit Number | 120 |
| Grit Type | 120 Grit |
| Included Components | GB 3-1/2" (89MM) 120SC FLEX-HONE |
| Item Diameter | 3.5 inches |
| Item Dimensions | 13.5 x 5.1 x 5.1 inches |
| Item Weight | 11.36 ounces |
| Manufacturer | Brush Research Manufacturing |
| Material | Silicon Carbide |
| Material Type | Silicon Carbide |
| Model | GB31212 |
| Number of Items | 1 |
| Number of Pieces | 1 |
| Part Number | GB31212 |
| Recommended Uses For Product | Deburring, Finishing |
| UPC | 843469142832 |
| Unit Count | 1 Count |
| Warranty Description | Manufacturer Warranty |
J**E
It works
It does what it’s supposed to do
T**M
good value
Just what i needed to repair a engine. Good quality at a reasonable price.
C**N
Works well
Just what my husband needed for some engine rebuild work. The size is correct and the quality is good.
B**S
Worked for Intended Purpose
Needed this to refresh some bores that were bored out oversized and had oiling consumption issues. I Ordered new rings and wanted to refresh the cross-hatch. as seen in first image of the bore, the machining marks are visible however the cross hatch isn't except for at the top where the crown sits and the rings don't ride on the cylinder walls. I used two Flex Hones to achieve the desired result, a somewhat course one & then a finer one for the finish. Hopefully the rings will Bedd themselves in nicely and have good oil retention. This is on a Toyota 2JZ 6 Cylinder Engine with an overbore of 86.5mm
K**P
dingleberry
did a good job honing a vw 1.8t
P**R
Quality product
Works well. Good value.
C**R
Excellent
Excellent, worked well
D**N
Worked Well
As described
A**R
Flexi-Hone 3.5”
Did a great job, really easy to use
Trustpilot
2 weeks ago
2 weeks ago