--- product_id: 97953475 title: "Brush Research BC78400AO Flex-Hone®, 7/8\" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials" brand: "flex-hone" price: "€ 117.95" currency: EUR in_stock: true reviews_count: 8 category: "Flex Hone" url: https://www.desertcart.pt/products/97953475-brush-research-bc78400ao-flex-hone-7-8-22-2mm-diameter store_origin: PT region: Portugal --- # 400 grit precision abrasive self-centering & self-aligning design Made in USA quality Brush Research BC78400AO Flex-Hone®, 7/8" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials **Brand:** flex-hone **Price:** € 117.95 **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your cylinder finish game — don’t settle for less than perfect! ## Quick Answers - **What is this?** Brush Research BC78400AO Flex-Hone®, 7/8" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials by flex-hone - **How much does it cost?** € 117.95 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/97953475-brush-research-bc78400ao-flex-hone-7-8-22-2mm-diameter) ## Best For - flex-hone enthusiasts ## Why This Product - Trusted flex-hone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual-Function Efficiency:** Simultaneously deburr and finish in one streamlined operation. - • **Precision Surface Refinement:** Achieve a flawless 10-20 microinch finish for superior seal performance. - • **Trusted American Craftsmanship:** Invented and manufactured in the USA for unmatched reliability. - • **Effortless Self-Aligning Action:** Oversized design ensures perfect centering and consistent pressure every time. - • **Versatile Material Compatibility:** Optimized for aluminum, brass, bronze & softer non-ferrous metals. ## Overview The Brush Research BC78400AO Flex-Hone® is a premium 7/8" diameter honing tool featuring 400 grit aluminum oxide abrasive, engineered for precision finishing and deburring of aluminum, brass, bronze, and other soft non-ferrous materials. Its patented oversized, self-centering design delivers consistent crosshatch finishes that enhance oil retention and seal longevity, making it ideal for hydraulic, pneumatic, and engine cylinders. Proudly made in the USA, this tool streamlines maintenance and rebuilds with professional-grade results. ## Description 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, Z-Grain, Leviagted Alumina, CBN 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. Review: Worked for exactly what I needed. - I needed a flex hone to clean up the inside of a Moen Positemp shower valve, when replacing a leaking cartridge. This worked perfectly to clean the corrosion and scale from the inside of the valve body, and left a pristine surface for the new cartridge to seal against. I’ve used these for years on engine cylinders, so I had no doubt it would do the job needed. These are a bit pricey, but it was less expensive than replacing the entire faucet assembly in my shower. Review: Great product - Need to repair a damaged cylinder wall or cylinder with scratches. This is the tool works great and restores the cross hatches needed in a cylinder. Highly recommended!!! ## Features - [QUALITY]-Proudly Made in the USA. Quality and consistency you can count on made from the inventors and makers of the tool. - [DESIGN]-The FLEX-HONE is intentionally manufactured oversized. This engineered oversize creates the optimal amount of pressure inside the cylinder wall allowing the tool to be self-centering, self-aligning and self-compensating for wear and easy use. - [FINISHING BENEFITS]-Offered in a wide variety of grits to achieve specific finishing tolerances as well as a beautiful crosshatch finish. Ideal for rebuilding hydraulic and pneumatic cylinders, engine and brake cylinders, valve guides, pumps, compressors and more. - [CROSSHOLE DEBURRING]-Accomplish finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle from a hand drill, drill press or CNC equipment. - [400 GRIT ALUMINUM OXIDE ABRASIVE]-Excellent on Aluminum, Brass, Bronze, and softer non-ferrous materials. 240 AO is commonly used for deglazing Nikasil cylinders. Typically achieves a finish of 10 - 20 Microinch (.3 - .6 Micrometer). - [WHAT'S INCLUDED]-1 Each of a BC Standard Duty FLEX-HONE: 0.875" (22.2mm) Bore Diameter, 3" Abrasive Part Length, 0.228" Shank Diameter, 8" Overall Length. For Use on Bore Diameters Between 0.788"-0.875". PLEASE NOTE: ORDER BY BORE SIZE. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B002T01VTI | | Best Sellers Rank | #41,360 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #17 in Flex Hones | | Brand | Flex-Hone | | Brand Name | Flex-Hone | | Bristle Type | Abrasive Globule Bonded To Flexible Nylon Filament | | Compatible Material | Aluminum, Brass, Bronze, Nikasil Cylinders, Softer Non-Ferrous Materials | | Customer Reviews | 4.5 out of 5 stars 34 Reviews | | Global Trade Identification Number | 00843469130907 | | Grit Material | Aluminum Oxide | | Grit Material Type | Aluminum Oxide | | Grit Number | 400 | | Grit Type | 400 Grit | | Included Components | FLEX-HONE® Tool | | Item Diameter | 0.88 inches | | Item Dimensions | 8 x 0.88 x 0.04 inches | | Item Dimensions L x W | 8"L x 0.88"W | | Item Weight | 2.08 ounces | | Manufacturer | Brush Research Manufacturing | | Material | Aluminum Oxide | | Material Type | Aluminum Oxide | | Model | BC78400AO | | Number of Items | 1 | | Number of Packs | 1 | | Number of Pieces | 1 | | Part Number | BC78400AO | | Product Dimensions | 8"L x 0.88"W | | Recommended Uses For Product | Deburring, Finishing | | UPC | 843469130907 | | Unit Count | 1 Count | | Warranty Description | Manufacturer Warranty | ## Product Details - **Brand:** Flex-Hone - **Bristle Type:** Abrasive Globule Bonded To Flexible Nylon Filament - **Grit Material:** Aluminum Oxide - **Grit Type:** 400 Grit - **Material:** Aluminum Oxide ## Images ![Brush Research BC78400AO Flex-Hone®, 7/8" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 1](https://m.media-amazon.com/images/I/71ThmY8M1kL.jpg) ![Brush Research BC78400AO Flex-Hone®, 7/8" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 2](https://m.media-amazon.com/images/I/611kzMYaF5L.jpg) ![Brush Research BC78400AO Flex-Hone®, 7/8" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 3](https://m.media-amazon.com/images/I/71EZRkPmdaL.jpg) ![Brush Research BC78400AO Flex-Hone®, 7/8" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 4](https://m.media-amazon.com/images/I/81aPGQTXemL.jpg) ![Brush Research BC78400AO Flex-Hone®, 7/8" (22.2mm) Diameter, 400 Grit, Aluminum Oxide, for Aluminum, Brass, Bronze and Softer Non-Ferrous Materials - Image 5](https://m.media-amazon.com/images/I/81X4pgWlJtL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worked for exactly what I needed. *by L***N on December 8, 2023* I needed a flex hone to clean up the inside of a Moen Positemp shower valve, when replacing a leaking cartridge. This worked perfectly to clean the corrosion and scale from the inside of the valve body, and left a pristine surface for the new cartridge to seal against. I’ve used these for years on engine cylinders, so I had no doubt it would do the job needed. These are a bit pricey, but it was less expensive than replacing the entire faucet assembly in my shower. ### ⭐⭐⭐⭐⭐ Great product *by B***S on May 15, 2022* Need to repair a damaged cylinder wall or cylinder with scratches. This is the tool works great and restores the cross hatches needed in a cylinder. Highly recommended!!! ### ⭐⭐⭐⭐⭐ Quality product *by A***R on October 14, 2022* Flex hone brand are a quality product, used for chainsaw cylinder. Works well. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/97953475-brush-research-bc78400ao-flex-hone-7-8-22-2mm-diameter](https://www.desertcart.pt/products/97953475-brush-research-bc78400ao-flex-hone-7-8-22-2mm-diameter) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-16*