{"product_id":"40-08b-50-10a-60-12a-chain-sprocket-10t-30t-double-row-tooth-roller-chain","title":"#40 08B #50 10A #60 12A Chain Sprocket 10T - 30T Double Row Tooth Roller Chain","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eANSI #40 \/ #50 \/ #60 Double-Row Roller Chain Sprocket — Precision Drivetrain Control for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a single-strand sprocket simply cannot handle the torque load, engineers and serious DIYers reach for a double-row (duplex) roller chain sprocket. Whether you are rebuilding a go-kart drivetrain, upgrading a conveyor system, or designing a custom power-transmission assembly, mismatched or worn sprockets cause chain skip, accelerated wear, and costly downtime. This sprocket series is engineered to eliminate those pain points for makers, fabricators, and maintenance professionals who need a reliable, drop-in solution.\u003c\/p\u003e\n\u003cp\u003eEach sprocket in this series is machined from medium-carbon steel and covers three of the most widely used ANSI roller chain standards: #40 (08B) with a 1\/2-inch (12.7 mm) pitch, #50 (10A) with a 5\/8-inch (15.875 mm) pitch, and #60 (12A) with a 3\/4-inch (19.05 mm) pitch. Tooth counts run from 10T through 30T, with outer diameters ranging from approximately 45 mm (1.77 in) for the smallest #40-10T up to 189 mm (7.44 in) for the largest #60-30T. All variants are offered individually (1 PCS per order) so you can source exactly the quantity your project demands.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include go-kart and mini-bike final-drive assemblies requiring a double-row #40 sprocket for added load capacity, industrial conveyor line upgrades where a #50 duplex sprocket replaces a worn single-strand unit, and custom agricultural or workshop machinery builds that call for a heavy-duty #60 double-row chain sprocket with a large tooth count for low-speed, high-torque reduction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for ANSI\/ISO duplex (double-row) roller chains — #40 \/ 08B (12.7 mm pitch), #50 \/ 10A (15.875 mm pitch), and #60 \/ 12A (19.05 mm pitch). Confirm your chain standard, pitch, and bore requirement before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Double-Row Roller Chain Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eThree ANSI Chain Standards in One Listing\u003c\/strong\u003e\n\u003cp\u003eChoose from #40 (12.7 mm pitch), #50 (15.875 mm pitch), or #60 (19.05 mm pitch) duplex sprockets — all available in a single, easy-to-navigate product page so you can source the exact standard your drivetrain requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Range: 10T to 30T\u003c\/strong\u003e\n\u003cp\u003eWith 21 tooth-count options per chain standard, you can dial in your exact gear ratio for speed reduction or torque multiplication — from compact 10-tooth drive sprockets to large 30-tooth driven sprockets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eDouble-Row (Duplex) Design for Higher Load Capacity\u003c\/strong\u003e\n\u003cp\u003eThe duplex tooth profile accepts a double-strand roller chain, effectively doubling the power-transmission capacity compared to a single-row sprocket of the same pitch — ideal for high-torque or high-cycle applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eMedium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from medium-carbon steel for a balance of toughness and machinability. The material resists deformation under cyclic loading and can be further hardened or surface-treated if your application demands it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003ePrecision-Machined Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eEach tooth is cut to ANSI\/ISO dimensional tolerances, ensuring smooth chain engagement, reduced vibration, and consistent pitch-line contact across the full tooth-count range from 10T to 30T.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eSold Individually — Order Exactly What You Need\u003c\/strong\u003e\n\u003cp\u003eEvery variant ships as 1 PCS, so you are never forced to buy in bulk. Mix and match sprocket types and tooth counts to build or repair your drivetrain without excess inventory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Double-Row Roller Chain Sprockets\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003e#40 (08B) \/ #50 (10A) \/ #60 (12A)\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 — #40\u003c\/th\u003e\n\u003ctd\u003e1\/2 inch (12.7 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch — #50\u003c\/th\u003e\n\u003ctd\u003e5\/8 inch (15.875 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch — #60\u003c\/th\u003e\n\u003ctd\u003e3\/4 inch (19.05 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e45 mm – 189 mm (1.77 in – 7.44 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eMedium-Carbon Steel\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 Style\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\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 between #40, #50, and #60 for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the sprocket to your existing roller chain standard. #40 (12.7 mm pitch) is common in go-karts, light conveyors, and small machinery. #50 (15.875 mm pitch) suits medium-duty industrial drives and agricultural equipment. #60 (19.05 mm pitch) is used in heavier industrial machinery where higher torque capacity is needed. Always verify the pitch stamped on your chain or in your equipment manual before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the advantage of a double-row (duplex) sprocket over a single-row sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA duplex sprocket works with a double-strand roller chain, which roughly doubles the tensile load capacity and power-transmission rating compared to a single-row setup of the same pitch. This makes it the right choice when your drive system experiences high torque, shock loads, or continuous heavy-duty cycling that would overstress a single-strand chain and sprocket.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct tooth count for my gear ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDivide the driven sprocket tooth count by the drive sprocket tooth count to get your reduction ratio. For example, a 10T drive sprocket paired with a 30T driven sprocket gives a 3:1 reduction — the output shaft turns at one-third the input speed with three times the torque. Use this formula to calculate the tooth counts you need for your target speed or torque output.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these sprockets corrosion-resistant for outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe base material is medium-carbon steel, which provides good mechanical strength but has limited inherent corrosion resistance. For outdoor, humid, or wash-down environments, we recommend applying a chain lubricant regularly and considering a surface treatment such as zinc plating or black oxide if your application demands it. Contact us to confirm available finish options for your specific variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the bore size fits my shaft before ordering?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count and chain standard. Measure your shaft diameter with a caliper, then check the variant detail page or contact us to confirm the bore size for your chosen sprocket type and tooth count. Many sprockets in this series feature a pilot bore that can be machined to a custom diameter by a local machine shop if the standard bore does not match your shaft.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these sprockets with a single-row roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These are duplex (double-row) sprockets designed specifically for double-strand roller chains. Using a single-row chain on a duplex sprocket will result in improper chain seating, accelerated wear, and potential chain derailment. If you need a single-row sprocket, please browse our single-strand sprocket listings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the outer diameter for a specific tooth count and chain standard?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOuter diameters are listed in the variant selector under \"Outer Diameter \u0026amp; Amount.\" As a reference: #40-10T is 45 mm, #40-30T is 126 mm, #50-10T is 57 mm, #50-30T is 158 mm, #60-10T is 69 mm, and #60-30T is 189 mm. Select your Sprocket Type and Pitch first, and the corresponding outer diameter will display automatically.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Sprocket Type, Pitch, and Outer Diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"#40 - 10T \/ 1\/2 inch (12.7mm) \/ 45mm \u0026 1PCS","offer_id":52423340196114,"sku":"GYJLTSHXJZC0972x1","price":21.73,"currency_code":"USD","in_stock":true},{"title":"#40 - 12T \/ 1\/2 inch (12.7mm) \/ 53mm \u0026 1PCS","offer_id":52423340228882,"sku":"GYJLTSHXJZC0973x1","price":27.88,"currency_code":"USD","in_stock":true},{"title":"#40 - 13T \/ 1\/2 inch (12.7mm) \/ 57mm \u0026 1PCS","offer_id":52423340261650,"sku":"GYJLTSHXJZC0974x1","price":30.98,"currency_code":"USD","in_stock":true},{"title":"#40 - 14T \/ 1\/2 inch (12.7mm) \/ 61mm \u0026 1PCS","offer_id":52423340294418,"sku":"GYJLTSHXJZC0975x1","price":34.14,"currency_code":"USD","in_stock":true},{"title":"#40 - 15T \/ 1\/2 inch (12.7mm) \/ 65mm \u0026 1PCS","offer_id":52423340327186,"sku":"GYJLTSHXJZC0976x1","price":45.02,"currency_code":"USD","in_stock":true},{"title":"#40 - 16T \/ 1\/2 inch (12.7mm) \/ 69mm \u0026 1PCS","offer_id":52423340359954,"sku":"GYJLTSHXJZC0977x1","price":51.11,"currency_code":"USD","in_stock":true},{"title":"#40 - 17T \/ 1\/2 inch (12.7mm) \/ 73mm \u0026 1PCS","offer_id":52423340392722,"sku":"GYJLTSHXJZC0978x1","price":58.72,"currency_code":"USD","in_stock":true},{"title":"#40 - 18T \/ 1\/2 inch (12.7mm) \/ 77mm \u0026 1PCS","offer_id":52423340425490,"sku":"GYJLTSHXJZC0979x1","price":66.61,"currency_code":"USD","in_stock":true},{"title":"#40 - 19T \/ 1\/2 inch (12.7mm) \/ 82mm \u0026 1PCS","offer_id":52423340458258,"sku":"GYJLTSHXJZC0980x1","price":74.66,"currency_code":"USD","in_stock":true},{"title":"#40 - 20T \/ 1\/2 inch (12.7mm) \/ 86mm \u0026 1PCS","offer_id":52423340491026,"sku":"GYJLTSHXJZC0981x1","price":83.1,"currency_code":"USD","in_stock":true},{"title":"#40 - 21T \/ 1\/2 inch (12.7mm) \/ 90mm \u0026 1PCS","offer_id":52423340523794,"sku":"GYJLTSHXJZC0982x1","price":90.55,"currency_code":"USD","in_stock":true},{"title":"#40 - 22T \/ 1\/2 inch (12.7mm) \/ 94mm \u0026 1PCS","offer_id":52423340556562,"sku":"GYJLTSHXJZC0983x1","price":103.33,"currency_code":"USD","in_stock":true},{"title":"#40 - 23T \/ 1\/2 inch (12.7mm) \/ 98mm \u0026 1PCS","offer_id":52423340589330,"sku":"GYJLTSHXJZC0984x1","price":114.48,"currency_code":"USD","in_stock":true},{"title":"#40 - 24T \/ 1\/2 inch (12.7mm) \/ 102mm \u0026 1PCS","offer_id":52423340622098,"sku":"GYJLTSHXJZC0985x1","price":125.91,"currency_code":"USD","in_stock":true},{"title":"#40 - 25T \/ 1\/2 inch (12.7mm) \/ 106mm \u0026 1PCS","offer_id":52423340654866,"sku":"GYJLTSHXJZC0986x1","price":136.24,"currency_code":"USD","in_stock":true},{"title":"#40 - 26T \/ 1\/2 inch (12.7mm) \/ 110mm \u0026 1PCS","offer_id":52423340687634,"sku":"GYJLTSHXJZC0987x1","price":149.84,"currency_code":"USD","in_stock":true},{"title":"#40 - 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12T \/ 5\/8 inch (15.875mm) \/ 67mm \u0026 1PCS","offer_id":52423340917010,"sku":"GYJLTSHXJZC1015x1","price":45.02,"currency_code":"USD","in_stock":true},{"title":"#50 - 13T \/ 5\/8 inch (15.875mm) \/ 72mm \u0026 1PCS","offer_id":52423340949778,"sku":"GYJLTSHXJZC1016x1","price":55.35,"currency_code":"USD","in_stock":true},{"title":"#50 - 14T \/ 5\/8 inch (15.875mm) \/ 77mm \u0026 1PCS","offer_id":52423340982546,"sku":"GYJLTSHXJZC1017x1","price":64.98,"currency_code":"USD","in_stock":true},{"title":"#50 - 15T \/ 5\/8 inch (15.875mm) \/ 82mm \u0026 1PCS","offer_id":52423341015314,"sku":"GYJLTSHXJZC1018x1","price":77.11,"currency_code":"USD","in_stock":true},{"title":"#50 - 16T \/ 5\/8 inch (15.875mm) \/ 87mm \u0026 1PCS","offer_id":52423341048082,"sku":"GYJLTSHXJZC1019x1","price":89.08,"currency_code":"USD","in_stock":true},{"title":"#50 - 17T \/ 5\/8 inch (15.875mm) \/ 92mm \u0026 1PCS","offer_id":52423341080850,"sku":"GYJLTSHXJZC1020x1","price":101.97,"currency_code":"USD","in_stock":true},{"title":"#50 - 18T \/ 5\/8 inch (15.875mm) \/ 97mm \u0026 1PCS","offer_id":52423341113618,"sku":"GYJLTSHXJZC1021x1","price":116.01,"currency_code":"USD","in_stock":true},{"title":"#50 - 19T \/ 5\/8 inch (15.875mm) \/ 103mm \u0026 1PCS","offer_id":52423341146386,"sku":"GYJLTSHXJZC1022x1","price":130.8,"currency_code":"USD","in_stock":true},{"title":"#50 - 20T \/ 5\/8 inch (15.875mm) \/ 108mm \u0026 1PCS","offer_id":52423341179154,"sku":"GYJLTSHXJZC1023x1","price":146.04,"currency_code":"USD","in_stock":true},{"title":"#50 - 21T \/ 5\/8 inch (15.875mm) \/ 113mm \u0026 1PCS","offer_id":52423341211922,"sku":"GYJLTSHXJZC1024x1","price":160.45,"currency_code":"USD","in_stock":true},{"title":"#50 - 22T \/ 5\/8 inch (15.875mm) \/ 118mm \u0026 1PCS","offer_id":52423341244690,"sku":"GYJLTSHXJZC1025x1","price":178.95,"currency_code":"USD","in_stock":true},{"title":"#50 - 23T \/ 5\/8 inch (15.875mm) \/ 123mm \u0026 1PCS","offer_id":52423341277458,"sku":"GYJLTSHXJZC1026x1","price":197.34,"currency_code":"USD","in_stock":true},{"title":"#50 - 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