{"product_id":"45-roller-chain-sprocket-with-keyway-04c-sprocket-21t-29t-bore-8mm-25mm","title":"#45 Roller Chain Sprocket With Keyway 04C Sprocket 21T-29T Bore 8mm-25mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e#45 Roller Chain Sprocket — Precision 04C Sprocket for Reliable Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized sprocket causes chain slip, skipped teeth, or premature chain wear, finding an exact-fit replacement becomes critical. Makers, machine builders, and repair technicians working on conveyors, go-karts, mini bikes, agricultural equipment, and industrial drives need a sprocket that matches both the chain pitch and the shaft bore without custom machining.\u003c\/p\u003e\n\u003cp\u003eThis 04C roller chain sprocket is machined from carbon steel and is available in tooth counts from 21T to 29T, with bore sizes ranging from 6mm to 25mm (approximately 0.24 in to 0.98 in). Standard plain-bore and keyway variants are offered; keyway options include common keyway dimensions such as 3×1.4mm, 4×1.8mm, 5×2.3mm, and 6×2.8mm to suit a wide range of shaft configurations.\u003c\/p\u003e\n\u003cp\u003eTypical applications include #45 \/ 04C roller chain drives on go-kart rear axles, small conveyor systems, motorized garden equipment, and DIY power transmission builds. The keyway variants are especially suited for driven shafts requiring positive torque transfer without set-screw slippage, making them a reliable choice for 04C chain sprocket replacement and custom chain drive assembly projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e Compatible with \u003cstrong\u003e#45 \/ 04C roller chain\u003c\/strong\u003e (12.7mm \/ 0.500 in pitch). Verify bore size and keyway dimensions against your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 04C 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\u003eWide Tooth Count Range\u003c\/strong\u003e — Available in 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, and 29T to match your target gear ratio and chain drive layout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eMultiple Bore Options\u003c\/strong\u003e — Plain bore sizes from 6mm to 25mm (0.24–0.98 in) accommodate a broad range of shaft diameters without additional machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🗝️\u003c\/span\u003e \u003cstrong\u003eKeyway Variants Available\u003c\/strong\u003e — Keyway options (3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm) provide positive shaft engagement and prevent rotational slippage under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e — Machined from carbon steel for the hardness and wear resistance needed in continuous-duty chain drive applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e04C \/ #45 Chain Standard\u003c\/strong\u003e — Tooth profile conforms to the 04C (12.7mm pitch) roller chain standard, ensuring correct engagement and minimizing chain wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDirect Replacement Fit\u003c\/strong\u003e — Designed as a drop-in replacement for worn 04C sprockets on go-karts, conveyors, agricultural drives, and DIY power transmission builds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 04C Roller Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003e04C \/ #45 Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e12.7mm (0.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (T)\u003c\/th\u003e\n\u003ctd\u003e21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6mm – 25mm (0.24 in – 0.98 in) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm (keyway variants only)\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\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\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pc per order\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 21T drive sprocket paired with a 42T driven sprocket gives a 2:1 reduction. Choose a tooth count that achieves your target output speed or torque based on your motor RPM and load requirements.\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\u003eMeasure your shaft diameter with a caliper before ordering. Select the bore size that matches your shaft exactly. For keyway variants, also confirm the keyway width and depth on your shaft matches one of the available keyway dimensions (3×1.4mm, 4×1.8mm, 5×2.3mm, or 6×2.8mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway version or a plain bore version?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA keyway version is recommended when the sprocket must transmit significant torque without slipping on the shaft, such as on driven axles or output shafts. A plain bore version secured with a set screw is suitable for lighter-duty or positioning applications. If your shaft already has a machined keyway, select the matching keyway variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with #40 or #50 roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. This sprocket is designed specifically for 04C \/ #45 roller chain with a 12.7mm (0.500 in) pitch. It is not compatible with #40 chain (12.7mm pitch but different roller diameter) or #50 chain (15.875mm pitch). Always verify the chain pitch and roller diameter match before installing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is a carbon steel sprocket under continuous load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel provides a good balance of hardness and toughness for roller chain sprocket applications. It resists tooth wear under normal continuous-duty loads. For very high-speed or high-shock applications, ensure the sprocket is properly lubricated and that chain tension is correctly adjusted to maximize service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I prevent corrosion on this sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel sprockets are susceptible to surface rust in humid or wet environments. Apply a light coat of chain lubricant or anti-rust oil during storage and regular use. For outdoor or wash-down environments, consider periodic re-lubrication and inspect for surface corrosion during routine maintenance.\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?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. 04C \/ #45 chain and sprockets are commonly used on go-karts and mini bikes. Select the tooth count that matches your desired top speed and torque, and choose a bore size that fits your rear axle diameter. Keyway variants are recommended for the driven rear sprocket to prevent slippage under acceleration loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Type (tooth count \u0026amp; keyway) and Bore size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"04C 21T \/ 8mm \/ 1","offer_id":52423199064338,"sku":"DGYNYGLCDPJ00291x1","price":12.7,"currency_code":"USD","in_stock":true},{"title":"04C 21T \/ 10mm \/ 1","offer_id":52423199097106,"sku":"DGYNYGLCDPJ00292x1","price":12.7,"currency_code":"USD","in_stock":true},{"title":"04C 21T \/ 13mm \/ 1","offer_id":52423199129874,"sku":"DGYNYGLCDPJ00293x1","price":12.7,"currency_code":"USD","in_stock":true},{"title":"04C 21T \/ 15mm \/ 1","offer_id":52423199162642,"sku":"DGYNYGLCDPJ00294x1","price":12.7,"currency_code":"USD","in_stock":true},{"title":"04C 21T \/ 17mm \/ 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