{"product_id":"duplex-chain-sprocket-12a-12t-24t-pitch-19-05mm-60-roller-chain","title":"Duplex Chain Sprocket 12T - 24T Pitch 19.05mm For #60 12A Roller Chain 45#Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eDuplex Chain Sprocket 12A — Precision-Matched for #60 Roller Chain Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or mismatched sprocket causes chain skip, vibration, or premature wear, the entire drivetrain suffers — and so does your project timeline. Whether you're building a conveyor, agricultural machine, go-kart, or industrial automation rig, the right duplex sprocket is the foundation of a reliable chain drive. These 12A duplex chain sprockets are engineered to pair directly with #60 (12A) double-strand roller chain, giving makers, fabricators, and machine builders a drop-in solution that holds up under real working loads.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# medium-carbon steel, chosen for its balance of hardness, toughness, and machinability. The tooth profile conforms to the ISO 606 \/ ANSI B29.1 standard for 12A chain, with a pitch of 19.05 mm (¾ inch). Available tooth counts range from 12T to 24T, with bore and hub dimensions varying by model — refer to variant options for exact bore sizing. Overall sprocket diameter scales with tooth count, typically from approximately 75 mm (2.95 in) at 12T up to approximately 150 mm (5.91 in) at 24T.\u003c\/p\u003e\n\u003cp\u003eThese duplex sprockets are well-suited for conveyor drive systems requiring synchronized dual-strand tension, power transmission setups on small agricultural equipment such as seeders and tillers, custom go-kart and mini-bike rear axle assemblies using #60 chain, and DIY automation projects where a compact, torque-capable chain drive is needed. The duplex (double-strand) configuration doubles the load-carrying capacity compared to a simplex sprocket of the same pitch, making it the right choice when single-strand chain would be undersized for the application.\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 \u003cstrong\u003e#60 \/ 12A double-strand (duplex) roller chain\u003c\/strong\u003e with a pitch of \u003cstrong\u003e19.05 mm (¾ in)\u003c\/strong\u003e. Not compatible with simplex (single-strand) chain or other pitch sizes.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 12A 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\u003eDuplex (Double-Strand) Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eTwo parallel tooth rows machined to ISO 606 \/ ANSI B29.1 tolerances for #60 \/ 12A roller chain. The dual-strand design doubles load capacity versus a simplex sprocket at the same pitch, reducing chain stress and extending drivetrain service life.\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 — a medium-carbon grade known for its combination of surface hardness after heat treatment and core toughness. Resists tooth deformation under shock loads and cyclic stress better than low-carbon alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e19.05 mm (¾ in) Pitch — Exact #60 Chain Match\u003c\/strong\u003e\n\u003cp\u003eThe 19.05 mm pitch is the defining dimension of #60 \/ 12A roller chain. Every tooth is cut to this pitch so rollers seat fully and evenly, eliminating the uneven contact that causes accelerated wear on both chain and sprocket.\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 to 24T\u003c\/strong\u003e\n\u003cp\u003eEleven tooth-count options from 12T through 24T let you dial in your drive ratio precisely. Pair a small driver sprocket with a larger driven sprocket to multiply torque, or match tooth counts for a 1:1 speed transfer — all within the same chain standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Surface Finish\u003c\/strong\u003e\n\u003cp\u003eEach sprocket receives a protective surface treatment to slow oxidation in moderately humid workshop and outdoor environments. For continuous wet or chemical exposure, pair with a stainless or sealed chain and apply a compatible chain lubricant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eMachined Bore Ready for Keying or Set-Screw Mounting\u003c\/strong\u003e\n\u003cp\u003eThe bore is finish-machined to a consistent diameter (see variant options for exact bore size). The hub accepts standard keyways and set-screw configurations, making shaft mounting straightforward without custom machining in most applications.\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 — 12A Duplex Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003e#60 \/ 12A Duplex (Double-Strand) Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e19.05 mm (¾ in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStrand Type\u003c\/th\u003e\n\u003ctd\u003eDuplex (2-strand)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Tooth Counts\u003c\/th\u003e\n\u003ctd\u003e12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T\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\u003eHub Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Width (duplex)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e~72.8 mm (12T) to ~145.6 mm (24T)\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\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eKeyway + set-screw compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs (per listing)\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\u003eYour drive ratio is determined by dividing the driven sprocket's tooth count by the driver sprocket's tooth count. For example, pairing a 12T driver with a 24T driven sprocket gives a 2:1 reduction — the output shaft turns at half the speed but with twice the torque. Start by calculating the speed and torque you need at the output shaft, then select tooth counts that achieve that ratio within the 12T–24T range available here.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these sprockets work with standard #60 simplex (single-strand) roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These are duplex (double-strand) sprockets machined with two parallel tooth rows to match #60 \/ 12A duplex roller chain. Using them with single-strand #60 chain will result in misalignment and rapid wear. If you need a simplex sprocket for #60 chain, please check our simplex sprocket listings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size does each sprocket have, and can I have it bored to a custom size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count — please refer to the variant options on this page for the exact bore size of each model. The bore is finish-machined and accepts standard keyways. If you need a non-standard bore diameter, we recommend consulting a local machine shop to bore the sprocket to your shaft size after purchase, as the 45# steel machines cleanly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these sprockets under load? What is the working load capacity?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 45# steel construction provides solid tensile strength (typically 600–800 MPa depending on heat treatment), and the duplex configuration doubles the load-carrying capacity compared to a simplex sprocket of the same pitch. Exact working load depends on your RPM, chain tension, and lubrication conditions. For critical load calculations, refer to the ANSI B29.1 chain drive design standard or consult an engineer for your specific application.\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\u003eEach sprocket has a protective surface finish that provides moderate resistance to oxidation in typical workshop and outdoor conditions. For continuous exposure to moisture, salt spray, or chemicals, we recommend applying a compatible chain lubricant regularly and pairing with a corrosion-resistant roller chain. For highly corrosive environments, consider stainless steel sprocket options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify this sprocket is compatible with my existing chain before ordering?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eConfirm two things: (1) your chain is #60 or 12A duplex roller chain with a 19.05 mm pitch, and (2) your chain is double-strand (duplex), not single-strand. You can measure chain pitch by placing the chain flat and measuring center-to-center between any two roller pins 10 links apart, then dividing by 10 — the result should be 19.05 mm (¾ in). If both conditions match, these sprockets are compatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between 12A and #60 chain designation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e#60 is the ANSI designation and 12A is the ISO 606 designation for the same chain standard — both refer to roller chain with a 19.05 mm (¾ in) pitch. These sprockets are machined to this shared pitch standard and are compatible with chain sold under either designation, as long as it is the duplex (double-strand) variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003etooth count (Models)\u003c\/strong\u003e above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"12A-12 Teeth \/ 1 Pcs","offer_id":52423335837970,"sku":"GLFBQLWGLBZSJ073331x1","price":132.72,"currency_code":"USD","in_stock":true},{"title":"12A-13 Teeth \/ 1 Pcs","offer_id":52423335870738,"sku":"GLFBQLWGLBZSJ073332x1","price":147.55,"currency_code":"USD","in_stock":true},{"title":"12A-14 Teeth \/ 1 Pcs","offer_id":52423335903506,"sku":"GLFBQLWGLBZSJ073333x1","price":178.42,"currency_code":"USD","in_stock":true},{"title":"12A-15 Teeth \/ 1 Pcs","offer_id":52423335936274,"sku":"GLFBQLWGLBZSJ073334x1","price":209.29,"currency_code":"USD","in_stock":true},{"title":"12A-16 Teeth \/ 1 Pcs","offer_id":52423335969042,"sku":"GLFBQLWGLBZSJ073335x1","price":273.89,"currency_code":"USD","in_stock":true},{"title":"12A-17 Teeth \/ 1 Pcs","offer_id":52423336001810,"sku":"GLFBQLWGLBZSJ073336x1","price":315.72,"currency_code":"USD","in_stock":true},{"title":"12A-18 Teeth \/ 1 Pcs","offer_id":52423336034578,"sku":"GLFBQLWGLBZSJ073337x1","price":346.46,"currency_code":"USD","in_stock":true},{"title":"12A-19 Teeth \/ 1 Pcs","offer_id":52423336067346,"sku":"GLFBQLWGLBZSJ073338x1","price":378.34,"currency_code":"USD","in_stock":true},{"title":"12A-20 Teeth \/ 1 Pcs","offer_id":52423336100114,"sku":"GLFBQLWGLBZSJ073339x1","price":402.41,"currency_code":"USD","in_stock":true},{"title":"12A-22 Teeth \/ 1 Pcs","offer_id":52423336132882,"sku":"GLFBQLWGLBZSJ073340x1","price":472.45,"currency_code":"USD","in_stock":true},{"title":"12A-24 Teeth \/ 1 Pcs","offer_id":52423336165650,"sku":"GLFBQLWGLBZSJ073341x1","price":602.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-13_fb5c9605-92fe-48e9-bd08-ac6f6ba96797.jpg?v=1782744745","url":"https:\/\/homediyer.com\/products\/duplex-chain-sprocket-12a-12t-24t-pitch-19-05mm-60-roller-chain","provider":"HomeDIYer","version":"1.0","type":"link"}