{"product_id":"40-chain-sprocket-10t-60t-pitch-12-7mm-double-row-tooth-for-40-roller-chain","title":"#40 Chain Sprocket 10T-60T Pitch 12.7mm Double Row Tooth for #40 Roller Chain","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e#40 Double Row Chain Sprocket — Precision 12.7mm Pitch Drive for #40 Roller Chain\u003c\/h2\u003e\n\u003cp\u003eWhen a single-row sprocket just can't handle the load, engineers and makers reach for a double-row solution. Whether you're building a heavy-duty conveyor, a go-kart drivetrain, or an industrial power-transmission system, mismatched or worn sprockets cause chain skip, premature wear, and costly downtime. These #40 double row chain sprockets are engineered to deliver smooth, reliable torque transfer across a wide tooth range — from compact 10-tooth drive pinions to large 60-tooth driven wheels.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined to suit #40 (08B) roller chain with a 12.7mm (0.500 in) pitch. The double-row tooth profile accommodates duplex #40 chain, providing roughly twice the load capacity of a single-strand setup. Tooth counts span 10T through 60T, covering a broad gear-ratio range in a single product family. Hub bore and keyway dimensions vary by tooth count — see variant options for exact bore specifications.\u003c\/p\u003e\n\u003cp\u003eTypical applications include go-kart and mini-bike final drives requiring a compact #40 duplex sprocket, conveyor and material-handling systems where a double-strand roller chain sprocket reduces chain tension, and light industrial machinery such as packaging equipment, agricultural implements, and power-transmission assemblies that demand a reliable 12.7mm pitch sprocket with high tooth-count options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eCompatible Chain:\u003c\/strong\u003e #40 \/ 08B Duplex Roller Chain — Pitch 12.7mm (0.500 in) — Double Strand\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These #40 Double Row Chain Sprockets\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Range (10T–60T)\u003c\/strong\u003e\u003cbr\u003eA single product family covers drive pinions to large driven sprockets, letting you dial in the exact gear ratio your application needs without sourcing from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eDouble-Row (Duplex) Tooth Profile\u003c\/strong\u003e\u003cbr\u003eDesigned specifically for #40 duplex roller chain, the twin-row tooth geometry distributes load across two strands simultaneously — effectively doubling torque capacity versus a single-row sprocket at the same pitch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e12.7mm (0.500 in) Pitch Accuracy\u003c\/strong\u003e\u003cbr\u003eTooth spacing is held to tight tolerances to match #40 \/ 08B chain pitch precisely, minimizing polygon effect, reducing vibration, and extending both chain and sprocket service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Surface Treatment\u003c\/strong\u003e\u003cbr\u003eSprockets receive a protective surface finish that resists oxidation in moderately humid or lightly oiled environments — suitable for indoor industrial and hobbyist workshop conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e \u003cstrong\u003eMachined Hub with Keyway-Ready Bore\u003c\/strong\u003e\u003cbr\u003eThe hub is machined to accept a standard keyed shaft, enabling positive torque lock without relying solely on set screws. Bore diameter varies by tooth count — select your variant to confirm the bore size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement Compatibility\u003c\/strong\u003e\u003cbr\u003eTooth profile and pitch conform to ANSI #40 \/ ISO 08B standards, making these sprockets direct drop-in replacements for worn OEM sprockets on conveyors, go-karts, and light industrial drives.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — #40 Double Row Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003eANSI #40 \/ ISO 08B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Type\u003c\/th\u003e\n\u003ctd\u003eDuplex (Double Row) Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e12.7mm (0.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 30T, 34T, 35T, 36T, 37T, 38T, 39T, 40T, 41T, 43T, 45T, 46T, 48T, 50T, 55T, 60T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eOxidation-resistant protective finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 PCS per order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eGo-karts, conveyors, industrial power transmission, agricultural machinery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your drive ratio. Divide the driven sprocket teeth by the drive sprocket teeth to get the reduction ratio. For example, a 10T drive sprocket paired with a 40T driven sprocket gives a 4:1 reduction. Select a smaller tooth count on the drive side for more torque, or a larger count for higher speed. If you're replacing an existing sprocket, match the tooth count exactly to maintain your current ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat chain does this sprocket fit — #40 or 08B?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis sprocket is designed for #40 \/ 08B duplex roller chain. Both designations refer to the same 12.7mm (0.500 in) pitch standard — #40 is the ANSI designation used in North America, while 08B is the ISO designation common in Europe. Either chain will fit these sprockets correctly as long as it is the duplex (double-strand) version.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy do I need a double-row (duplex) sprocket instead of a single-row one?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA double-row sprocket is used with duplex roller chain to transmit higher loads than a single-strand setup of the same pitch. By running two parallel strands of chain simultaneously, the system roughly doubles the tensile load capacity and distributes stress more evenly across the drive. This is especially valuable in go-kart final drives, heavy conveyor systems, and industrial machinery where a single #40 chain would be undersized.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket fit my shaft directly, or do I need to machine the bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe bore diameter varies by tooth count. Many variants ship with a pilot bore that can be machined to your exact shaft diameter and keyway dimensions by a local machine shop. Some variants may ship with a finished bore — please check the variant detail or contact us to confirm the bore size before ordering if you need a specific shaft fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket suitable for outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese sprockets carry a protective surface finish that resists light oxidation in moderately humid, indoor workshop conditions. For prolonged outdoor exposure, wet environments, or washdown applications, we recommend applying a chain lubricant or anti-corrosion coating regularly. For highly corrosive environments, consider stainless steel sprockets instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket as a direct replacement for my existing OEM sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — as long as your existing sprocket is rated for #40 \/ 08B duplex roller chain with a 12.7mm pitch and the tooth count matches. The tooth profile conforms to ANSI #40 \/ ISO 08B standards, making it a compatible replacement for most OEM sprockets on conveyors, go-karts, mini-bikes, and light industrial equipment. Verify the bore diameter and hub dimensions match your shaft before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum RPM or load rating for these sprockets?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMaximum RPM and load capacity depend on the specific tooth count, bore size, shaft fit, lubrication, and operating conditions. As a general guideline, #40 duplex roller chain drives are rated for moderate-speed, moderate-to-high torque applications. For precise load ratings, refer to the ANSI #40 chain manufacturer's power rating tables and match them to your selected tooth count. Contact us if you need application-specific guidance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count (Number of Teeth) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"#40-08B \/ 10T \/ 1PCS","offer_id":52423339082002,"sku":"GYJLTGLBZSJ073000x1","price":16.29,"currency_code":"USD","in_stock":true},{"title":"#40-08B \/ 11T \/ 1PCS","offer_id":52423339114770,"sku":"GYJLTGLBZSJ073001x1","price":25.81,"currency_code":"USD","in_stock":true},{"title":"#40-08B \/ 12T \/ 1PCS","offer_id":52423339147538,"sku":"GYJLTGLBZSJ073002x1","price":30.33,"currency_code":"USD","in_stock":true},{"title":"#40-08B \/ 13T \/ 1PCS","offer_id":52423339180306,"sku":"GYJLTGLBZSJ073003x1","price":34.79,"currency_code":"USD","in_stock":true},{"title":"#40-08B \/ 14T \/ 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