{"product_id":"simplex-sprocket-wheel-40-08b-roller-chain-9t-60t","title":"Simplex Sprocket Wheel for #40 ( 08B ) Roller Chain, 9T to 60T, Pitch 1\/2\" inch","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSimplex Sprocket Wheel for #40 (08B) Roller Chain — Precision-Machined, 9T to 60T\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized sprocket causes chain skip, premature wear, or misalignment in your drive system, finding an exact-fit replacement shouldn't slow your project down. This simplex sprocket wheel is engineered for makers, machine builders, and mechanical DIYers who need a reliable, dimensionally accurate #40 (08B) sprocket without the lead time of custom fabrication.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from carbon steel with a natural or lightly finished surface, available in tooth counts from 9T to 60T and bore sizes ranging from 10 mm (0.39 in) to 20 mm (0.79 in). The 1\/2-inch (12.7 mm) pitch conforms to the ISO 08B-1 \/ ANSI #40 standard, ensuring dimensional interchangeability across compatible chain and sprocket systems.\u003c\/p\u003e\n\u003cp\u003eTypical applications include conveyor drive systems requiring a #40 chain sprocket replacement, go-kart and mini-bike rear axle sprocket upgrades, and custom automation or robotics builds using standard roller chain drive components. Whether you're sourcing a 9-tooth small drive sprocket or a 60-tooth large driven sprocket, this range covers the full spectrum of single-strand #40 chain drive configurations.\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 #40 \/ ISO 08B-1 Single-Strand Roller Chain — Pitch 1\/2 inch (12.7 mm)\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These #40 (08B) Simplex Sprocket Wheels\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eFull ANSI #40 \/ ISO 08B-1 Compliance\u003c\/strong\u003e\u003cbr\u003eTooth profile and pitch geometry conform to the 08B-1 single-strand roller chain standard, ensuring drop-in compatibility with any #40 chain without modification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Range: 9T to 60T\u003c\/strong\u003e\u003cbr\u003eChoose from 9 to 60 teeth to achieve your target gear ratio. Smaller tooth counts (9T–15T) suit high-speed drive shafts; larger counts (40T–60T) are ideal for slow, high-torque driven shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eMultiple Bore Sizes: 10 mm to 20 mm\u003c\/strong\u003e\u003cbr\u003eBore options scale with tooth count — from 10 mm for compact 9T–15T sprockets up to 20 mm for 50T–60T versions — covering the most common shaft diameters in DIY and light industrial applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from carbon steel for a balance of machinability and wear resistance. Suitable for moderate-load, moderate-speed drive applications typical of conveyors, go-karts, and custom machinery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003ePrecision-Machined Bore and Hub\u003c\/strong\u003e\u003cbr\u003eEach sprocket features a machined bore for consistent shaft fit. The hub is sized proportionally to the tooth count, providing adequate material for keyway or set-screw modifications where needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDirect Replacement or New Build Ready\u003c\/strong\u003e\u003cbr\u003eWhether you're replacing a failed sprocket in an existing drive or building a new chain drive from scratch, these sprockets are ready to install on standard shafts with no additional machining required for the listed bore sizes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — #40 (08B) Simplex Roller Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003eANSI #40 \/ ISO 08B-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Type\u003c\/th\u003e\n\u003ctd\u003eSingle-Strand (Simplex) Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e1\/2 inch (12.7 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e9T – 60T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size Range\u003c\/th\u003e\n\u003ctd\u003e10 mm – 20 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ Lightly Finished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eSolid Hub\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\u003eSet Screw\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\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\u003eThe tooth count determines your drive ratio. Divide the driven sprocket teeth by the drive sprocket teeth to get the reduction ratio. For example, a 9T drive sprocket paired with a 45T driven sprocket gives a 5:1 reduction. Use a smaller tooth count on the motor\/engine shaft and a larger count on the output shaft for speed reduction and torque multiplication.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect the bore size that matches your shaft diameter. Bore sizes in this listing range from 10 mm (for 9T–15T sprockets) up to 20 mm (for 50T–60T sprockets). Measure your shaft with a caliper before ordering. If you need a bore size not listed, the sprocket can typically be bored out by a local machine shop.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with standard #40 roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This sprocket is designed to the ANSI #40 \/ ISO 08B-1 standard with a 1\/2-inch (12.7 mm) pitch. It is compatible with any standard single-strand #40 or 08B-1 roller chain from any manufacturer, as long as the chain pitch matches.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is this sprocket under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe carbon steel construction provides solid performance for moderate-load applications such as go-karts, conveyors, and light machinery. For heavy industrial or high-shock-load applications, consult the chain manufacturer's rated working load for #40 chain and ensure your sprocket tooth count and shaft size are appropriately sized for the torque involved.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this sprocket resist corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel sprockets have moderate corrosion resistance. For outdoor or wet environments, we recommend applying a light coat of chain lubricant or anti-rust spray regularly. For highly corrosive environments, consider stainless steel sprockets instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I add a keyway or set screw to this sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe sprocket hub has sufficient material for a local machine shop to add a keyway or set screw hole if not already present. This is a common modification for securing the sprocket to a keyed shaft. Check the hub dimensions for your selected variant before proceeding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between ANSI #40 and ISO 08B-1?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBoth designations refer to roller chain with a 1\/2-inch (12.7 mm) pitch, but there are minor dimensional differences in roller diameter and inner plate width between the ANSI and ISO standards. This sprocket is designed to the ISO 08B-1 profile, which is the international standard. In most practical DIY and light industrial applications, #40 and 08B-1 chains and sprockets are interchangeable, but verify chain dimensions if mixing brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Number of Teeth \u0026amp; Bore Size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"#40（08B-1） \/ 1\/2 inch（12.7 mm） \/ 9T \u0026 10 mm","offer_id":52423346716946,"sku":"PENG072949x1","price":5.02,"currency_code":"USD","in_stock":true},{"title":"#40（08B-1） \/ 1\/2 inch（12.7 mm） \/ 10T \u0026 10 mm","offer_id":52423346749714,"sku":"PENG072950x1","price":5.56,"currency_code":"USD","in_stock":true},{"title":"#40（08B-1） \/ 1\/2 inch（12.7 mm） \/ 11T \u0026 10 mm","offer_id":52423346782482,"sku":"PENG072951x1","price":6.11,"currency_code":"USD","in_stock":true},{"title":"#40（08B-1） \/ 1\/2 inch（12.7 mm） \/ 12T \u0026 10 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mm","offer_id":52423348355346,"sku":"PENG072999x1","price":121.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of12_82fb0411-5185-4c0c-8257-507649f56542.jpg?v=1782819981","url":"https:\/\/homediyer.com\/products\/simplex-sprocket-wheel-40-08b-roller-chain-9t-60t","provider":"HomeDIYer","version":"1.0","type":"link"}