{"product_id":"08b-double-strand-roller-chain-sprocket-10-30-teeth-45-steel","title":"Roller Chain Sprocket 10~30 Teeth 08B Double-Strand Sprocket 45# Steel Burr Hole","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e08B Double-Strand Roller Chain Sprocket — Precision-Machined 45# Steel, 11T to 30T\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or mismatched sprocket is causing chain skip, premature wear, or unexpected downtime on your conveyor, drive shaft, or power-transmission build, you need a drop-in replacement that holds tolerance under load. This 08B double-strand sprocket is engineered for makers, machine builders, and maintenance professionals who demand dimensional accuracy and consistent engagement across every tooth.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# medium-carbon steel and features a center burr hole for shaft mounting. The 08B pitch (12.7 mm \/ 0.500 in) matches standard duplex roller chain. Tooth counts range from 11T to 30T, with outer diameters scaling accordingly from approximately 46 mm (1.81 in) at 11T to approximately 122 mm (4.80 in) at 30T. Hub and bore dimensions vary by tooth count — see variant options for exact figures.\u003c\/p\u003e\n\u003cp\u003eTypical applications include industrial conveyor drives requiring 08B duplex chain sprockets, DIY gearbox and reduction drive builds using double-strand roller chain, and agricultural or light-industrial machinery replacement sprocket sourcing where standard 08B pitch components are specified.\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 standard \u003cstrong\u003e08B duplex (double-strand) roller chain\u003c\/strong\u003e with 12.7 mm (1\/2 in) pitch. Verify bore diameter and hub dimensions against your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 08B Double-Strand Roller Chain Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n\u003cstrong\u003e08B Duplex Pitch Compliance\u003c\/strong\u003e\n\u003cp\u003eMachined to 12.7 mm (0.500 in) pitch to engage standard 08B double-strand roller chain without shimming or modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eManufactured from 45# steel for a balance of machinability, surface hardness, and tensile strength suited to moderate-to-heavy drive loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eWide Tooth-Count Selection (11T–30T)\u003c\/strong\u003e\n\u003cp\u003eEighteen tooth-count variants let you dial in your exact gear ratio — from compact 11T driver sprockets to larger 30T driven sprockets — without custom fabrication.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🕳️\u003c\/div\u003e\n\u003cstrong\u003eCenter Burr Hole for Shaft Mounting\u003c\/strong\u003e\n\u003cp\u003eEach sprocket includes a machined center bore (burr hole) ready for direct shaft insertion or further boring to your required shaft diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eConsistent Tooth Profile Geometry\u003c\/strong\u003e\n\u003cp\u003eTooth flanks are cut to ISO\/DIN 08B profile standards, ensuring smooth chain seating, even load distribution, and reduced chain elongation over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eDouble-Strand (Duplex) Track Width\u003c\/strong\u003e\n\u003cp\u003eThe duplex sprocket body accommodates two parallel chain strands simultaneously, doubling load capacity compared to a single-strand 08B sprocket of the same tooth count.\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 — 08B Double-Strand Roller Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003e08B Duplex (Double-Strand)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e12.7 mm (0.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStrand Count\u003c\/th\u003e\n\u003ctd\u003e2 (Double \/ Duplex)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e11T – 30T (18 variants)\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\u003eMounting Style\u003c\/th\u003e\n\u003ctd\u003eCenter Burr Hole\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\u003eOuter 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\u003eHub Length\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\u003eNatural \/ Machined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Standard\u003c\/th\u003e\n\u003ctd\u003eISO\/DIN 08B\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 determines the tooth count pairing. Divide the driven sprocket teeth by the driver sprocket teeth to get the reduction ratio. For example, a 30T driven sprocket paired with a 15T driver gives a 2:1 reduction. Select the tooth count that achieves your target output speed or torque, then confirm the resulting pitch-circle diameter fits within your frame clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat chain does this sprocket fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis sprocket is designed exclusively for \u003cstrong\u003e08B duplex (double-strand) roller chain\u003c\/strong\u003e with a 12.7 mm (1\/2 in) pitch. It will not correctly engage 08A (ANSI #40) single-strand chain or any other pitch. Always verify the chain pitch marking before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter does the sprocket come with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach sprocket ships with a machined center burr hole. The as-supplied bore diameter varies by tooth count — please refer to the variant detail page or contact us to confirm the exact bore for your selected tooth count. The bore can typically be enlarged by a machinist to match your shaft diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# medium-carbon steel offers a tensile strength of approximately 600–800 MPa in the normalized condition, making it well-suited for moderate-to-heavy conveyor, reduction drive, and light-industrial power-transmission applications. For high-shock or very high-speed applications, consider whether a heat-treated or alloy-steel sprocket would better suit your load profile.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket rust or corrode?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel is not inherently corrosion-resistant. For outdoor, washdown, or humid environments, apply a chain lubricant or anti-rust coating after installation, or consider a stainless-steel sprocket alternative. Regular lubrication of both the chain and sprocket teeth is recommended to extend service life in all environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket with a single-strand 08B chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. This is a \u003cstrong\u003edouble-strand (duplex)\u003c\/strong\u003e sprocket with two sets of tooth tracks. Using it with a single-strand chain will result in misalignment and accelerated wear. If you need a single-strand 08B sprocket, please browse our 08B simplex sprocket listings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the sprocket will fit my shaft before ordering?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter with a caliper, then compare it to the as-supplied bore diameter for your chosen tooth count (contact us to confirm). If the bore is smaller than your shaft, a local machine shop can bore it out. If the bore is already larger than your shaft, a keyway and set-screw arrangement or a taper-lock bushing adapter may be required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003eNumber of Teeth\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":"11T","offer_id":52423379058962,"sku":"WXB073034x1","price":26.36,"currency_code":"USD","in_stock":true},{"title":"12T","offer_id":52423379091730,"sku":"WXB073035x1","price":30.16,"currency_code":"USD","in_stock":true},{"title":"13T","offer_id":52423379124498,"sku":"WXB073036x1","price":34.52,"currency_code":"USD","in_stock":true},{"title":"14T","offer_id":52423379157266,"sku":"WXB073037x1","price":40.12,"currency_code":"USD","in_stock":true},{"title":"15T","offer_id":52423379190034,"sku":"WXB073038x1","price":46.48,"currency_code":"USD","in_stock":true},{"title":"16T","offer_id":52423379222802,"sku":"WXB073039x1","price":50.56,"currency_code":"USD","in_stock":true},{"title":"17T","offer_id":52423379255570,"sku":"WXB073040x1","price":58.72,"currency_code":"USD","in_stock":true},{"title":"18T","offer_id":52423379288338,"sku":"WXB073041x1","price":70.31,"currency_code":"USD","in_stock":true},{"title":"19T","offer_id":52423379321106,"sku":"WXB073042x1","price":74.94,"currency_code":"USD","in_stock":true},{"title":"20T","offer_id":52423379353874,"sku":"WXB073043x1","price":98.06,"currency_code":"USD","in_stock":true},{"title":"21T","offer_id":52423379386642,"sku":"WXB073044x1","price":91.36,"currency_code":"USD","in_stock":true},{"title":"22T","offer_id":52423379419410,"sku":"WXB073045x1","price":104.42,"currency_code":"USD","in_stock":true},{"title":"23T","offer_id":52423379452178,"sku":"WXB073046x1","price":118.84,"currency_code":"USD","in_stock":true},{"title":"24T","offer_id":52423379484946,"sku":"WXB073047x1","price":128.63,"currency_code":"USD","in_stock":true},{"title":"25T","offer_id":52423379517714,"sku":"WXB073048x1","price":136.95,"currency_code":"USD","in_stock":true},{"title":"26T","offer_id":52423379550482,"sku":"WXB073049x1","price":147.12,"currency_code":"USD","in_stock":true},{"title":"28T","offer_id":52423379583250,"sku":"WXB073050x1","price":165.89,"currency_code":"USD","in_stock":true},{"title":"30T","offer_id":52423379616018,"sku":"WXB073051x1","price":198.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_9a8f674f-6436-4c13-96d9-dbdbcda61755.jpg?v=1782822928","url":"https:\/\/homediyer.com\/products\/08b-double-strand-roller-chain-sprocket-10-30-teeth-45-steel","provider":"HomeDIYer","version":"1.0","type":"link"}