{"product_id":"08b-chain-drive-flat-sprocket-12-7mm-pitch-31-45-tooth","title":"08B Chain Drive Flat Sprocket Chain Links Pitch 12.7mm 31-45 Tooth Roller Chain","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e08B Roller Chain Sprocket — Precision Flat Sprocket for 12.7mm Pitch Chain Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or mismatched sprocket causes chain skip, premature wear, or unexpected downtime on your drive system, finding an exact-fit replacement becomes urgent. Whether you are a maker building a custom conveyor, a hobbyist assembling a go-kart drivetrain, or a maintenance technician replacing worn components on light industrial equipment, having the right tooth count and pitch match is non-negotiable for smooth, reliable power transmission.\u003c\/p\u003e\n\u003cp\u003eThis flat sprocket is machined to suit \u003cstrong\u003e08B roller chain with a 12.7mm (1\/2 inch) pitch\u003c\/strong\u003e. Available in tooth counts from \u003cstrong\u003e31T to 45T\u003c\/strong\u003e, each sprocket features a precision-bored center hub and evenly spaced teeth for consistent chain engagement. The flat plate (simplex) design keeps the profile compact and lightweight, making it well-suited for space-constrained drive assemblies.\u003c\/p\u003e\n\u003cp\u003eTypical applications include \u003cstrong\u003e08B chain drive conveyor systems\u003c\/strong\u003e, \u003cstrong\u003esmall engine power transmission builds\u003c\/strong\u003e, \u003cstrong\u003eDIY go-kart and mini-bike drivetrains\u003c\/strong\u003e, and \u003cstrong\u003elight-duty industrial machinery sprocket replacement\u003c\/strong\u003e. The 31–45 tooth range covers a wide gear ratio spread, giving builders and engineers the flexibility to tune speed and torque output to their specific requirements.\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 08B Simplex Roller Chain — 12.7mm (1\/2\") Pitch | ISO 08B \/ BS 08B Standard\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 08B Roller Chain Sprockets\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eExact 12.7mm Pitch Match\u003c\/strong\u003e\u003cbr\u003eEngineered to the ISO 08B \/ BS 08B standard with a 12.7mm (1\/2\") pitch, ensuring precise tooth-to-chain engagement and eliminating the chain skip that comes from mismatched components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Selection (31T–45T)\u003c\/strong\u003e\u003cbr\u003eEleven tooth count options from 31T to 45T let you dial in the exact gear ratio your drivetrain needs — whether you are optimizing for torque, speed, or a balance of both.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eFlat Simplex Plate Design\u003c\/strong\u003e\u003cbr\u003eThe single-strand flat sprocket profile keeps axial width minimal, making it ideal for compact drive assemblies where clearance between components is limited.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eMachined Tooth Profile for Reduced Wear\u003c\/strong\u003e\u003cbr\u003eTeeth are precision-formed to the standard involute profile, distributing chain load evenly across each tooth flank to extend both sprocket and chain service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eVersatile Drive System Compatibility\u003c\/strong\u003e\u003cbr\u003eSuitable for conveyors, go-karts, mini-bikes, agricultural equipment, and light industrial machinery — anywhere an 08B simplex chain drive is specified.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSold Individually for Flexible Ordering\u003c\/strong\u003e\u003cbr\u003eEach listing is for one (1) sprocket, so you can order exactly the tooth count and quantity you need without paying for parts you do not require.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 08B Roller Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003eISO 08B \/ BS 08B Simplex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e12.7mm (1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e31T, 32T, 33T, 34T, 35T, 36T, 37T, 38T, 39T, 40T, 45T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSprocket Type\u003c\/th\u003e\n\u003ctd\u003eFlat \/ Simplex (Single Strand)\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\u003ePitch Circle 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\u003eFlat plate (no hub projection)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\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\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pcs per order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 (31T–45T) is right 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 ratio. A larger driven sprocket (more teeth) reduces output speed and increases torque; a smaller one does the opposite. For example, pairing a 15T drive sprocket with a 45T driven sprocket gives a 3:1 reduction. Use our tooth count range to fine-tune your speed and torque output to match your specific build requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with standard 08B roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This sprocket is designed specifically for \u003cstrong\u003eISO 08B \/ BS 08B simplex roller chain\u003c\/strong\u003e with a 12.7mm (1\/2\") pitch. It will not fit 40 ANSI chain (also 1\/2\" pitch) because the roller diameter and inner link width differ between the ISO and ANSI standards. Always confirm your chain standard before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size does this sprocket have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count and is listed in the variant details. If you need a specific bore size to match your shaft diameter, please check the variant specifications or contact us to confirm before purchasing. Many flat sprockets can also be re-bored by a machine shop to a custom diameter if needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow resistant is this sprocket to corrosion and outdoor use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCorrosion resistance depends on the material and surface finish of the specific variant. For outdoor or high-moisture environments, we recommend selecting a variant with a protective coating or using a compatible chain lubricant to extend service life. Contact us to confirm the finish specification for your chosen tooth count.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket on a go-kart or mini-bike drivetrain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — 08B simplex sprockets are widely used in go-kart and mini-bike builds. Verify that your existing chain is 08B (12.7mm pitch) and confirm the bore diameter matches your axle or jackshaft. The 31T–45T range gives you good flexibility for tuning top speed versus acceleration on small vehicle drivetrains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I check if my existing chain is worn and needs replacement along with the sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA worn chain will cause accelerated sprocket tooth wear even on a new sprocket. To check chain wear, measure 12 links end-to-end: a new 08B chain should measure exactly 152.4mm (12 × 12.7mm). If the measured length exceeds 154mm or more, the chain has stretched beyond the recommended service limit and should be replaced at the same time as the sprocket to avoid premature wear on both components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the sprocket sold as a set or individually?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach order is for \u003cstrong\u003eone (1) sprocket\u003c\/strong\u003e in the tooth count you select. This lets you order exactly what your build requires — whether you need a single replacement or multiple units for a multi-stage drive system. Simply adjust the quantity in your cart if you need more than one.\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 (Size) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"08B - 31T \/ 1 pcs","offer_id":52423402225938,"sku":"GYWYPSHXJZC1709x1","price":32.76,"currency_code":"USD","in_stock":true},{"title":"08B - 32T \/ 1 pcs","offer_id":52423402258706,"sku":"GYWYPSHXJZC1710x1","price":32.9,"currency_code":"USD","in_stock":true},{"title":"08B - 33T \/ 1 pcs","offer_id":52423402291474,"sku":"GYWYPSHXJZC1711x1","price":35.48,"currency_code":"USD","in_stock":true},{"title":"08B - 34T \/ 1 pcs","offer_id":52423402324242,"sku":"GYWYPSHXJZC1712x1","price":39.43,"currency_code":"USD","in_stock":true},{"title":"08B - 35T \/ 1 pcs","offer_id":52423402357010,"sku":"GYWYPSHXJZC1713x1","price":40.46,"currency_code":"USD","in_stock":true},{"title":"08B - 36T \/ 1 pcs","offer_id":52423402389778,"sku":"GYWYPSHXJZC1714x1","price":42.15,"currency_code":"USD","in_stock":true},{"title":"08B - 37T \/ 1 pcs","offer_id":52423402422546,"sku":"GYWYPSHXJZC1715x1","price":43.78,"currency_code":"USD","in_stock":true},{"title":"08B - 38T \/ 1 pcs","offer_id":52423402455314,"sku":"GYWYPSHXJZC1716x1","price":48.27,"currency_code":"USD","in_stock":true},{"title":"08B - 39T \/ 1 pcs","offer_id":52423402488082,"sku":"GYWYPSHXJZC1717x1","price":53.38,"currency_code":"USD","in_stock":true},{"title":"08B - 40T \/ 1 pcs","offer_id":52423402520850,"sku":"GYWYPSHXJZC1718x1","price":52.84,"currency_code":"USD","in_stock":true},{"title":"08B - 45T \/ 1 pcs","offer_id":52423402553618,"sku":"GYWYPSHXJZC1719x1","price":67.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of5_95d8219b-c7e8-4d9e-bb7c-8b68910382be.jpg?v=1782827439","url":"https:\/\/homediyer.com\/products\/08b-chain-drive-flat-sprocket-12-7mm-pitch-31-45-tooth","provider":"HomeDIYer","version":"1.0","type":"link"}