{"product_id":"flex-hone-3-1-4-in-120-grit-silicon-carbide-cylinder-finish","title":"FLEX-HONE 3-1\/4 in 120 Grit Silicon Carbide - Cylinder Finish","description":"\u003cp\u003eIn this review the FLEX-HONE 3-1\/4 in, 120 grit silicon carbide brush is evaluated as a practical finishing tool for engine builders and maintenance techs. The bottom line: it is best for anyone rebuilding hydraulic or engine cylinders who wants a consistent plateau crosshatch finish with minimal fuss. The tool's oversized, self-centering design and abrasive bead construction make it easy to use from a hand drill or drill press, and the finish quality is the single biggest reason to buy for routine bore refurbishment.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Manufactured domestically for consistent quality and reliability across multiple units and rebuild jobs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversized engineered design:\u003c\/strong\u003e The intentional oversize produces internal pressure inside the bore so the tool self-centers and compensates for wear for an even finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e120 grit silicon carbide abrasive:\u003c\/strong\u003e Delivers a plateau finish typically in the 35-50 microinch range, suitable for mild steel, stainless and cast iron bores.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrosshole deburring capability:\u003c\/strong\u003e Finishes and deburrs in a single pass and works in common rotating spindles from hand drills to CNC equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide application range:\u003c\/strong\u003e Useful on hydraulic and pneumatic cylinders, engine and brake cylinders, valve guides, pumps and compressors for consistent oil-holding crosshatch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe FLEX-HONE 3-1\/4 in 120 grit is aimed at home mechanics, machine shops and restoration shops who rebuild or service bores between 3.001 in and 3.250 in and need a reliable plateau honing tool. It suits technicians who prefer a simple, brush-style hone that produces a repeatable crosshatch finish without complex setups.\u003c\/p\u003e\n\u003cp\u003eThose needing mirror-polish surface finishes, extremely tight dimensional stock removal, or working on non-ferrous soft metals outside the listed materials should consider alternative abrasives or processes; this tool is optimized for softer ferrous materials and finishing rather than heavy material removal.\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 consistent crosshatch and plateau finish that holds oil well for seals and rings.\u003c\/li\u003e\n\u003cli\u003eEasy to use in a hand drill or drill press thanks to the self-centering oversized design.\u003c\/li\u003e\n\u003cli\u003eGood build quality and value, with customers noting it does not chatter or gouge when used properly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot intended for aggressive stock removal; it is a finishing tool that works best after primary machining or boring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eGBD31412 FLEX-HONE 3-1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAbrasive\u003c\/td\u003e\n\u003ctd\u003e120 grit silicon carbide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore diameter range\u003c\/td\u003e\n\u003ctd\u003eFor bores between 3.001 in - 3.250 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAbrasive part length\u003c\/td\u003e\n\u003ctd\u003e5 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank \u0026amp; overall 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\u003e35 - 50 microinch (0.9 - 1.4 micrometer) plateau\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe FLEX-HONE 3-1\/4 in 120 grit is a practical, well-built finishing hone for anyone refurbishing mild steel, stainless or cast iron bores in the specified size range. It delivers the expected crosshatch plateau finish, is simple to run in a hand drill or press, and represents solid value for routine cylinder finishing tasks.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat bore sizes does this hone cover?\u003c\/strong\u003e\u003cbr\u003eThe tool is sized for bores from 3.001 in to 3.250 in and should be ordered by bore size.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in a hand drill?\u003c\/strong\u003e\u003cbr\u003eYes, the FLEX-HONE works in virtually any rotating spindle including a hand drill, drill press or CNC equipment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat materials is the abrasive best for?\u003c\/strong\u003e\u003cbr\u003eThe 120 grit silicon carbide is recommended for mild steel, stainless steel, cast iron and other softer ferrous materials for a plateau finish.\u003c\/p\u003e","brand":"Flex-Hone","offers":[{"title":"Default Title","offer_id":48263574880475,"sku":"B002XUL1JO","price":65.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81krduQeadL._SL1500_69243f6a-f0d2-4360-a571-aacc930af3d8.jpg?v=1778306464","url":"https:\/\/gearmusthave.com\/products\/flex-hone-3-1-4-in-120-grit-silicon-carbide-cylinder-finish","provider":"GearMustHave","version":"1.0","type":"link"}