{"product_id":"duplex-chain-sprocket-12t-30t-pitch-15-875mm-for-50-10a-roller-chain-45-steel","title":"Duplex Chain Sprocket 12T - 30T Pitch 15.875mm For #50 10A Roller Chain 45#Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eDuplex Chain Sprocket for #50 10A Roller Chain — Precision-Cut 45# Steel, 12T to 30T\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or mismatched sprocket causes chain skip, accelerated wear, or unexpected downtime, the fix starts with a correctly spec'd replacement. These duplex chain sprockets are engineered for makers, machine builders, and maintenance professionals who need a reliable drive component that installs correctly the first time and holds up under continuous load.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# medium-carbon steel and designed to the ANSI #50 \/ ISO 10A standard with a pitch of 15.875 mm (5\/8 in). The duplex (double-strand) tooth profile accommodates two parallel roller chain strands side by side, doubling torque capacity compared to a simplex sprocket of the same tooth count. Tooth counts span 12T through 30T, covering a wide range of speed-ratio requirements. Bore diameter varies by tooth count — see variant options for exact bore dimensions.\u003c\/p\u003e\n\u003cp\u003eTypical applications include conveyor drive systems requiring high torque in a compact footprint, agricultural and industrial machinery using #50 duplex roller chain, and custom power-transmission builds where a specific gear ratio must be achieved with a double-strand chain drive.\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 with:\u003c\/strong\u003e ANSI #50 \/ ISO 10A duplex (double-strand) roller chain — pitch 15.875 mm (5\/8 in), inner width typically 9.53 mm (3\/8 in) per strand.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Duplex Chain Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eANSI #50 \/ ISO 10A Duplex Standard\u003c\/strong\u003e\n\u003cp\u003eTooth geometry and pitch (15.875 mm \/ 5\/8 in) conform to ANSI B29.1 and ISO 606 for #50 duplex chain, ensuring drop-in compatibility with standard double-strand roller chain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# steel (equivalent to SAE 1045), offering a tensile strength typically in the 570–700 MPa range — tough enough for sustained drive loads without excessive weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Range: 12T – 30T\u003c\/strong\u003e\n\u003cp\u003eSixteen tooth-count options from 12 to 30 teeth let you dial in the exact speed ratio your drive system requires, whether you need a fast output or a torque-multiplying reduction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDuplex (Double-Strand) Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eThe dual-row tooth profile transmits power across two parallel chain strands simultaneously, effectively doubling load capacity versus a single-strand sprocket of the same size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Surface Treatment\u003c\/strong\u003e\n\u003cp\u003eThe machined steel surface is treated to resist oxidation during storage and operation in typical indoor industrial environments. For harsh or wet environments, additional lubrication is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003ePrecision-Machined Bore and Keyway\u003c\/strong\u003e\n\u003cp\u003eEach sprocket features a machined center bore sized to the tooth count. Bore diameter and keyway dimensions vary by model — select your tooth count above to confirm the exact bore specification.\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 — Duplex Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003eANSI #50 \/ ISO 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Type\u003c\/th\u003e\n\u003ctd\u003eDuplex (Double-Strand) Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e15.875 mm (5\/8 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (T)\u003c\/th\u003e\n\u003ctd\u003e12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 24T, 25T, 26T, 27T, 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-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\u003eKeyway\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\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Length\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\u003eMachined steel, oxidation-resistant finish\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 know which tooth count to choose for my drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your speed ratio. Divide the driven sprocket teeth by the driver sprocket teeth to get the reduction ratio. For example, a 12T driver paired with a 24T driven sprocket gives a 2:1 reduction — the output shaft turns at half the input speed with twice the torque. Select the tooth count that achieves your target ratio while keeping chain wrap angle above 120° on the smaller sprocket.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket fit my existing #50 duplex roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — provided your chain is ANSI #50 or ISO 10A duplex (double-strand) with a pitch of 15.875 mm (5\/8 in). These sprockets are machined to that standard. If your chain is a different pitch or a simplex (single-strand) #50 chain, this sprocket will not be compatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is 45# steel and how strong is it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel is a medium-carbon steel (approximately equivalent to SAE\/AISI 1045) widely used for machined mechanical components. It offers a tensile strength typically in the 570–700 MPa range and good machinability, making it well-suited for sprockets, shafts, and gears operating under moderate to heavy cyclic loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket in a wet or outdoor environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe sprocket has a machined steel finish with basic oxidation resistance suitable for typical indoor industrial use. For outdoor, wet, or corrosive environments, we recommend applying a chain lubricant or anti-rust coating regularly, or considering a stainless-steel alternative if long-term corrosion resistance is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter and keyway does each tooth-count variant have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter and keyway dimensions vary by tooth count and are listed in the variant detail for each model. Select your tooth count from the options above to view the exact bore and keyway specification before ordering. If you need a custom bore size, contact us to confirm availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this a simplex or duplex sprocket, and does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis is a \u003cstrong\u003eduplex\u003c\/strong\u003e (double-strand) sprocket, meaning it has two rows of teeth to engage two parallel strands of roller chain simultaneously. A simplex sprocket has only one row. Using a duplex sprocket with a duplex chain roughly doubles the power transmission capacity compared to a simplex setup of the same pitch and tooth count. Do not use a duplex sprocket with a single-strand chain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I align the sprocket correctly on my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMount the sprocket on the shaft so the centerline of the sprocket teeth aligns with the centerline of the mating sprocket within ±0.5 mm lateral offset. Use a straightedge or laser alignment tool across the sprocket faces to check alignment before tensioning the chain. Misalignment accelerates tooth and chain wear significantly.\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 (Models) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"10A-12 Teeth \/ 1 Pcs","offer_id":52423335313682,"sku":"GLFBQLWGLBZSJ073188x1","price":62.9,"currency_code":"USD","in_stock":true},{"title":"10A-13 Teeth \/ 1 Pcs","offer_id":52423335346450,"sku":"GLFBQLWGLBZSJ073189x1","price":84.03,"currency_code":"USD","in_stock":true},{"title":"10A-14 Teeth \/ 1 Pcs","offer_id":52423335379218,"sku":"GLFBQLWGLBZSJ073190x1","price":96.95,"currency_code":"USD","in_stock":true},{"title":"10A-15 Teeth \/ 1 Pcs","offer_id":52423335411986,"sku":"GLFBQLWGLBZSJ073191x1","price":124.92,"currency_code":"USD","in_stock":true},{"title":"10A-16 Teeth \/ 1 Pcs","offer_id":52423335444754,"sku":"GLFBQLWGLBZSJ073192x1","price":148.99,"currency_code":"USD","in_stock":true},{"title":"10A-17 Teeth \/ 1 Pcs","offer_id":52423335477522,"sku":"GLFBQLWGLBZSJ073193x1","price":170.94,"currency_code":"USD","in_stock":true},{"title":"10A-18 Teeth \/ 1 Pcs","offer_id":52423335510290,"sku":"GLFBQLWGLBZSJ073194x1","price":186.44,"currency_code":"USD","in_stock":true},{"title":"10A-19 Teeth \/ 1 Pcs","offer_id":52423335543058,"sku":"GLFBQLWGLBZSJ073195x1","price":204.94,"currency_code":"USD","in_stock":true},{"title":"10A-20 Teeth \/ 1 Pcs","offer_id":52423335575826,"sku":"GLFBQLWGLBZSJ073196x1","price":272.34,"currency_code":"USD","in_stock":true},{"title":"10A-21 Teeth \/ 1 Pcs","offer_id":52423335608594,"sku":"GLFBQLWGLBZSJ073197x1","price":298.91,"currency_code":"USD","in_stock":true},{"title":"10A-22 Teeth \/ 1 Pcs","offer_id":52423335641362,"sku":"GLFBQLWGLBZSJ073198x1","price":315.51,"currency_code":"USD","in_stock":true},{"title":"10A-24 Teeth \/ 1 Pcs","offer_id":52423335674130,"sku":"GLFBQLWGLBZSJ073199x1","price":361.34,"currency_code":"USD","in_stock":true},{"title":"10A-25 Teeth \/ 1 Pcs","offer_id":52423335706898,"sku":"GLFBQLWGLBZSJ073200x1","price":383.72,"currency_code":"USD","in_stock":true},{"title":"10A-26 Teeth \/ 1 Pcs","offer_id":52423335739666,"sku":"GLFBQLWGLBZSJ073201x1","price":422.21,"currency_code":"USD","in_stock":true},{"title":"10A-27 Teeth \/ 1 Pcs","offer_id":52423335772434,"sku":"GLFBQLWGLBZSJ073202x1","price":435.05,"currency_code":"USD","in_stock":true},{"title":"10A-30 Teeth \/ 1 Pcs","offer_id":52423335805202,"sku":"GLFBQLWGLBZSJ073203x1","price":447.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-08_c763a775-f968-489a-be00-ab7d4bc98190.jpg?v=1782741549","url":"https:\/\/homediyer.com\/products\/duplex-chain-sprocket-12t-30t-pitch-15-875mm-for-50-10a-roller-chain-45-steel","provider":"HomeDIYer","version":"1.0","type":"link"}