{"product_id":"flex-hone-gb31432-3-1-4-in-320-grit-silicon-carbide-hone-workshop","title":"Flex-Hone GB31432 3-1\/4 in 320 Grit Silicon Carbide Hone - Workshop","description":"\u003cp\u003eIn this review the Flex-Hone GB31432 proves its value for anyone rebuilding cylinders or doing precision finishing on ferrous parts; the single biggest reason to buy is its consistent, oil-holding \u003cstrong\u003ecrosshatch finish\u003c\/strong\u003e that removes glaze without gouging. Designed and made in the USA, this 3-1\/4 in, 320 grit silicon carbide tool is best for mild steel, stainless and cast iron work where a plateau finish and reliable surface texture are required. It is straightforward to use in a hand drill or drill press and gives professional-looking results with minimal setup.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality construction:\u003c\/strong\u003e Proudly made in the USA for consistent performance and long-term dependability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversized design:\u003c\/strong\u003e The engineered oversize lets the tool self-center and compensate for wear so it stays aligned in the bore.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e320 grit silicon carbide:\u003c\/strong\u003e Abrasive choice yields an 18 to 30 microinch finish ideal for hydraulic, pneumatic and engine cylinder work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrosshole deburring:\u003c\/strong\u003e Finishes and deburrs in a single pass, saving time when working on valves, pumps and compressors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide compatibility:\u003c\/strong\u003e Works in hand drills, drill presses and CNC spindles for flexible workshop use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete sizing:\u003c\/strong\u003e Supplied for bores from 3.001 in to 3.250 in with a 0.310 in shank for standard chucks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis tool is aimed at mechanics, machinists and hobbyists who need a dependable hone for rebuilding hydraulic and engine components or restoring valve guides and small bores. If you routinely work on mild steel, stainless steel or cast iron and want an oil-retaining plateau finish without expensive equipment, this Flex-Hone is a practical choice.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users who need extremely fine or non-ferrous specialty abrasives not offered here, or applications requiring precision fixed-stone honing for exact dimensional material removal. For very large industrial bores there are larger specialty tools better suited than this 3-1\/4 in size.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eProduces a true plateau crosshatch finish that improves oil retention and sealing surfaces.\u003c\/li\u003e\n\u003cli\u003eEasy to use in common rotating spindles, making it accessible for small shops and home mechanics.\u003c\/li\u003e\n\u003cli\u003eDurable, American-made construction gives consistent results and good value for money.\u003c\/li\u003e\n\u003cli\u003eCombines deburring and finishing in one step, reducing handling time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLimited to bores between 3.001 in and 3.250 in, so multiple sizes are needed for varied work.\u003c\/li\u003e\n\u003cli\u003eNot intended for the hardest non-ferrous alloys where a different abrasive would be preferable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFlex-Hone (Brush Research)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eGB31432\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e3.250 in (83 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAbrasive\u003c\/td\u003e\n\u003ctd\u003e320 grit silicon carbide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended bore\u003c\/td\u003e\n\u003ctd\u003e3.001 in to 3.250 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank and length\u003c\/td\u003e\n\u003ctd\u003e0.310 in shank, 13.5 in overall length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical finish\u003c\/td\u003e\n\u003ctd\u003e18 - 30 microinch (.5 -.7 micrometer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Flex-Hone GB31432 is a solid, workshop-ready hone for anyone restoring hydraulic, pneumatic or engine cylinders of compatible size; its American-made build, self-centering design and 320 grit silicon carbide deliver a reliable plateau finish and good value. Buy it if you need an easy-to-use, durable abrasive that produces oil-retaining crosshatch surfaces; consider other grit options or sizes for different materials or bore dimensions.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this in a handheld drill?\u003c\/strong\u003e\u003cbr\u003eYes. The tool is designed to work in a hand drill, drill press or CNC spindle for flexible use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat materials is 320 grit silicon carbide best for?\u003c\/strong\u003e\u003cbr\u003e320 grit silicon carbide is excellent for mild steel, stainless steel, cast iron and other softer ferrous materials and typically yields an 18-30 microinch finish.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat bore sizes will this tool fit?\u003c\/strong\u003e\u003cbr\u003eThis unit is supplied for bore diameters from 3.001 in to 3.250 in; order by bore size to ensure correct fit.\u003c\/p\u003e","brand":"Flex-Hone","offers":[{"title":"Default Title","offer_id":48688667558107,"sku":"B0C39NJBJG","price":75.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61f9Ueb7-8L._SL1176_ea65e19a-32ba-4f15-9c21-4829b7784a55.jpg?v=1778701457","url":"https:\/\/gearmusthave.com\/products\/flex-hone-gb31432-3-1-4-in-320-grit-silicon-carbide-hone-workshop","provider":"GearMustHave","version":"1.0","type":"link"}