{"product_id":"flex-hone-gbd31224-3-1-2in-240-grit-silicon-carbide-durable-cylinder","title":"Flex-Hone GBD31224 3-1\/2in 240 Grit Silicon Carbide - Durable Cylinder","description":"\u003cp\u003eIn this review of the Flex-Hone GBD31224 3-1\/2in 240 grit tool, the bottom line is simple: it is a purpose-built honing brush for builders and technicians who need a consistent, oil-retaining crosshatch finish in bores between 3.251in and 3.500in. The review found the tool especially effective for finishing mild steel, stainless steel and cast iron cylinders without cutting or tearing metal, and it delivers the plateau style surface useful for cylinder rebuilds. Its engineered oversize design keeps the tool self-centering and easy to use in a hand drill or drill press.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality:\u003c\/strong\u003e Proudly made in the USA, the tool offers consistent manufacturing and build quality that pays off during repeated engine rebuilds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e The intentional oversize construction creates optimal pressure inside the bore so the hone is self-centering and compensates for wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinishing benefits:\u003c\/strong\u003e The abrasive bead design creates a true plateau finish and the desirable oil-holding crosshatch pattern for hydraulic and engine cylinders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrosshole deburring:\u003c\/strong\u003e The brush both deburrs and finishes in one pass, saving time when used in a rotating spindle like a hand drill or CNC machine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e240 grit silicon carbide:\u003c\/strong\u003e This grit works well on mild steel, stainless steel and cast iron to achieve a fine finish in the 24-32 microinch range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Supplied for bores 3.251in to 3.500in with a 0.310in shank that fits standard drill chucks for simple operation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Flex-Hone GBD31224 is aimed at mechanics, small engine rebuilders and maintenance technicians who need a reliable finishing tool for cylinders, valve guides, pumps and compressors. It is especially useful when a plateau finish and oil-retaining crosshatch are required rather than aggressive material removal.\u003c\/p\u003e\u003cp\u003eThose who need heavy stock removal or precise diameter reboring should look elsewhere; this tool is a finishing and deburring implement, not a substitute for a boring bar or precision reamer. It also suits users who prefer a quick, hand-drill-friendly solution rather than workshop-only equipment.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduces a consistent crosshatch plateau finish that helps oil retention and sealing.\u003c\/li\u003e\n\u003cli\u003eQuality construction and American manufacturing yield reliable performance across uses.\u003c\/li\u003e\n\u003cli\u003eEasy to use in common rotating spindles and does not chatter or gouge when used properly.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eNot intended for heavy stock removal; it is a finishing tool and requires pre-boring if large material removal is needed.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eGBD31224\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore diameter\u003c\/td\u003e\n\u003ctd\u003eFor 3.251in - 3.500in bores\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAbrasive grit\u003c\/td\u003e\n\u003ctd\u003e240 grit silicon carbide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAbrasive part length\u003c\/td\u003e\n\u003ctd\u003e5in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank diameter\u003c\/td\u003e\n\u003ctd\u003e0.310in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall length\u003c\/td\u003e\n\u003ctd\u003e13.5in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical finish\u003c\/td\u003e\n\u003ctd\u003e24 - 32 microinch (0.6 - 0.8 micrometer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Flex-Hone GBD31224 is a solid value for anyone rebuilding cylinders or finishing bores in mild steel, stainless and cast iron where a plateau, oil-retaining finish is the goal. Its American build quality, self-centering oversize design and easy compatibility with common drills make it a practical workshop tool; buy it when you want consistent finishing rather than aggressive cutting.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat bore sizes does this hone fit?\u003c\/strong\u003e\u003cbr\u003eIt is designed for bores from 3.251in to 3.500in and has a 5in abrasive length for adequate contact area.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan it be used in a hand drill?\u003c\/strong\u003e\u003cbr\u003eYes, the 0.310in shank fits standard drill chucks and the tool is effective in hand drills, drill presses and CNC spindles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat materials is the 240 grit best for?\u003c\/strong\u003e\u003cbr\u003eThe 240 grit silicon carbide is recommended for mild steel, stainless steel, cast iron and other softer ferrous materials.\u003c\/p\u003e","brand":"Flex-Hone","offers":[{"title":"Default Title","offer_id":48670171136219,"sku":"B002XUL1JE","price":70.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81krduQeadL._SL1500_82a21809-7fe6-4273-9d75-e20246babcad.jpg?v=1778711142","url":"https:\/\/gearmusthave.com\/products\/flex-hone-gbd31224-3-1-2in-240-grit-silicon-carbide-durable-cylinder","provider":"GearMustHave","version":"1.0","type":"link"}