🛠️ Elevate your engine rebuilds with the ultimate self-aligning honing powerhouse!
The Brush Research GBD31218 FLEX-HONE® is a 3.5-inch diameter, 180 grit silicon carbide honing tool designed for mild steel, stainless steel, cast iron, and softer ferrous materials. Its engineered oversized, self-centering design ensures optimal pressure and alignment inside cylinder bores between 3.251" and 3.5". This versatile tool simultaneously deburrs and finishes surfaces, producing a precise plateau crosshatch finish that enhances oil retention and seal longevity. Proudly made in the USA by the original FLEX-HONE® inventors, it is compatible with hand drills, drill presses, and CNC equipment, making it a must-have for professional engine builders and industrial applications.
| ASIN | B002XUL1J4 |
| Best Sellers Rank | #12,942 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Flex Hones |
| Date First Available | November 9, 2004 |
| Grit Type | 180 |
| Item Diameter | 3.5 Inches |
| Item Weight | 14.4 ounces |
| Item model number | GBD31218 |
| Manufacturer | Brush Research Manufacturing |
| Number of Pieces | 1 |
| Recommended Uses For Product | Deburring, Finishing |
| Set Name | GBD31218 |
| UPC | 843469148452 |
| Unit Count | 1.0 Count |
S**H
A Must-Have for Any Engine Builder
I recently used the Brush Research GBD40024 FLEX-HONE® (4”) while freshening up the cylinders on a small block Chevy 350, and I’ve got to say—this tool impressed me. Right out of the box, it felt solid and well-made. I chucked it into a cordless drill, added some honing oil, and gave each bore about 5–10 seconds of low-speed rotation. The crosshatch pattern it left was textbook perfect—clean, consistent, and exactly what you want before dropping in new rings. What I really appreciated was how forgiving it is, even if you’re not a pro machinist. It centers itself well and doesn’t gouge or chatter. It’s one of those tools that gives you great results without needing a bunch of setup or precision tooling. One heads-up: it’s not cheap, but the quality and time it saves make it absolutely worth the price. If you’re rebuilding an engine or refreshing an old bore, this hone is a no-brainer.
J**.
6.7 Cummins Hone
Quality product from a quality company. No one local to me sold them so I had to source it from Amazon. As always, it shipped quickly. The hone did its job and was the correct size and grit for a 6.7 Cummins bore. According to the chart, it should work with a 5.9 as well. Knowing what i know now, the balls have a lot of give to them so going 1/4-1/2 inch over would probably merit the same result. Money well spent on the job its intended to be used on.
A**.
Best hone on the market
These are the best hones money can buy just use them correctly and they will give you great results. I have been using this brand for over 20 years.
V**O
Best in the game.
Work as intended. Flex-hone is best in business for this products for many many years. I suggest pairing this purchase with their flex-hone lubricant for the perfect finish and ease to use. The size was perfect for my 81.5mm cylinders.
A**Y
Great Product arrived as agreed
Worked great! Would order again
J**.
Hone is smaller than i am needing
Was not a 4.5" bead hone. Measured by hone measurements and its smaller than a 4" Bead hone by hone measurements. Returned to amazon
D**X
Great
Worked great
K**K
Great hone
Works good. Used on a 07 chevy 5.3L flawless & good quality
M**H
great tool
N**L
Used on my LS and worked great!
A**R
It was delivered promptly and worked very well.
J**M
Works well
D**A
En verdad cubre las espectativas que tenía del producto.
Trustpilot
3 weeks ago
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