--- product_id: 7528793 title: "Brush Research GBD40024 FLEX-HONE®, 4\" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials" brand: "flex-hone" price: "682.66 DT" currency: TND in_stock: true reviews_count: 13 url: https://www.desertcart.tn/products/7528793-brush-research-gbd40024-flex-hone-4-101mm-diameter-240-grit store_origin: TN region: Tunisia --- # Versatile use Precision finish Made in USA Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials **Brand:** flex-hone **Price:** 682.66 DT **Availability:** ✅ In Stock ## Summary > 🔩 Elevate Your Finishing Game with Precision! ## Quick Answers - **What is this?** Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials by flex-hone - **How much does it cost?** 682.66 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/7528793-brush-research-gbd40024-flex-hone-4-101mm-diameter-240-grit) ## 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 - • **240 Grit Silicon Carbide:** Achieves a stunning finish of 24 - 32 Microinch. - • **Versatile Tooling Options:** Compatible with hand drills, drill presses, and CNC equipment. - • **Engineered Oversize Design:** Self-centering and self-aligning for effortless use. - • **Multi-Material Compatibility:** Perfect for mild steel, stainless steel, and cast iron. - • **Crosshole Deburring Capability:** Finish and deburr in one go, saving you time. ## Overview The Brush Research GBD40024 FLEX-HONE® is a high-quality, USA-made honing tool designed for precision finishing on a variety of materials, including mild steel and stainless steel. With its engineered oversize design and 240 grit silicon carbide abrasive, it ensures a flawless crosshatch finish while allowing for simultaneous finishing and deburring. This versatile tool is compatible with various rotating spindles, making it an essential addition to any professional's toolkit. ## 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 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. ## 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. - [240 GRIT SILICON CARBIDE ABRASIVE]-Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 24 - 32 Microinch (.6 - .8 Micrometer). - [WHAT'S INCLUDED]-1 Each of a GBD Heavy Duty FLEX-HONE: 4.000" (102mm) Bore Diameter, 6" Abrasive Part Length, 0.310" Shank Diameter, 13.5" Overall Length. For Use on Bore Diameters Between 3.751"-4.000". PLEASE NOTE: ORDER BY BORE SIZE. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B002XUL1M6 | | Best Sellers Rank | #16,916 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #5 in Flex Hones | | Brand Name | Flex-Hone | | Bristle Type | Abrasive Globule Bonded To Flexible Nylon Filament | | Color | Grey | | Compatible Material | Cast Iron, Mild Steel, Other Softer Ferrous Materials, Stainless Steel | | Customer Reviews | 4.7 4.7 out of 5 stars (662) 4.7 out of 5 stars | | Grit Material Type | Silicon Carbide | | Grit Number | 240 | | Grit Type | 240 | | Included Components | GBD 4" (101MM) 240SC FLEX-HONE | | Item Diameter | 4 Inches | | Item Dimensions | 13.9 x 5.1 x 5.1 inches | | Item Type Name | Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials | | Item Weight | 1.12 Pounds | | Manufacturer | Brush Research Manufacturing | | Material Type | Silicon Carbide | | Model | GBD40024 | | Number Of Items | 1 | | Number Of Pieces | 1 | | Part Number | GBD40024 | | Recommended Uses For Product | [Deburring, Finishing] | | Unit Count | 1.0 Count | | Upc | 843469149831 | | Warranty Description | Manufacturer Warranty | ## Product Details - **Material:** Silicon Carbide - **Brand:** Flex-Hone - **Grit Material:** Silicon Carbide - **Bristle Type:** Abrasive Globule Bonded To Flexible Nylon Filament - **Compatible Material:** Other Softer Ferrous Materials, Stainless Steel, Mild Steel, Cast Iron ## Images ![Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 1](https://m.media-amazon.com/images/I/81krduQeadL.jpg) ![Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 2](https://m.media-amazon.com/images/I/81baqGI+jzL.jpg) ![Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 3](https://m.media-amazon.com/images/I/71LI+vNqxIL.jpg) ![Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 4](https://m.media-amazon.com/images/I/81aPGQTXemL.jpg) ![Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Image 5](https://m.media-amazon.com/images/I/81X4pgWlJtL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Questions & Answers **Q: How much above 4.25 will it expand?** A: Winbfred,The tool does not expend but is manufactured oversize. Thus if you measured the hone it would be more like 4.370" but you need oversize for the globules to be pressed against the bore for the honing action. If your bore is grater than 4.290" choose the 4-1/2" hone **Q: I have a 94mm bore, will the 95mm tool work?** A: Should work with no problem. Most likely will get a better cleaning also. **Q: What’s the difference in Gb and gbd** A: GBD is the commercial version with 80% more globules along the shaft. For sizes larger than 4-1/8" the only tool that is offered by Flex-hone is the GBD style. **Q: what size do i need for a 4.040 bore? Thanks** A: 4-1/8" is the correct hone , enter ASIN #B002XUL1GW for 240 grit version ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Must-Have for Any Engine Builder *by on Reviewed in the United States May 30, 2025* 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. ### ⭐⭐⭐⭐⭐ 6.7 Cummins Hone *by on Reviewed in the United States November 25, 2025* 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. ### ⭐⭐⭐⭐⭐ Tighten up the drill *by on Reviewed in the United States March 30, 2026* Works like a champ ## Frequently Bought Together - Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials - Brush Research FHQ FLEX-HONE® Oil, Specially Formulated Honing Oil, 1 Quart Bottle (32 fl oz) - Permatex 81950 Ultra Slick Engine Assembly Lube, 4 oz. , Red --- ## 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.tn/products/7528793-brush-research-gbd40024-flex-hone-4-101mm-diameter-240-grit](https://www.desertcart.tn/products/7528793-brush-research-gbd40024-flex-hone-4-101mm-diameter-240-grit) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-02*