--- 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: "$209.44" currency: USD in_stock: true url: https://www.desertcart.us/products/7528793-brush-research-gbd40024-flex-hone-4-101mm-diameter-240-grit store_origin: US region: United States of America --- # 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:** $209.44 **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?** $209.44 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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 Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials ## 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. ## 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) ## 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 ## 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.us/products/7528793-brush-research-gbd40024-flex-hone-4-101mm-diameter-240-grit](https://www.desertcart.us/products/7528793-brush-research-gbd40024-flex-hone-4-101mm-diameter-240-grit) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-10*