{"product_id":"roller-chain-drive-sprocket-1-4-04c-10t-30t-pitch-6-35mm-m5-thread-45-steel","title":"Roller Chain Drive Sprocket 1\/4\" 04C 10T-30T Pitch 6.35mm M5 Thread 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e04C Roller Chain Drive Sprocket — Precision 1\/4\" Pitch for Small-Scale Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen your go-kart, mini bike, motorized bicycle, or DIY conveyor project demands a reliable drive sprocket that won't slip, strip, or wobble under load, finding the right 04C sprocket with the exact bore size can be a frustrating search. These 04C roller chain drive sprockets are engineered for makers, hobbyists, and repair technicians who need a drop-in replacement or a purpose-built drive component that fits first time.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# medium-carbon steel, offering a solid balance of hardness and toughness for small-pitch chain drive applications. The tooth profile is cut to match the 1\/4\" (6.35mm) pitch of standard 04C roller chain. Tooth counts range from 8T to 30T, and bore diameters span 6mm to 15mm, covering the most common shaft sizes in this class. The M5 threaded set-screw hole locks the sprocket firmly onto the shaft without requiring a keyway.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include go-kart and mini-moto drive systems, small conveyor belt drives for DIY automation projects, and motorized bicycle or e-bike reduction stages — anywhere a compact, low-pitch chain drive sprocket is needed to transmit torque from a motor shaft to a driven axle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eChain Compatibility:\u003c\/strong\u003e Designed for standard \u003cstrong\u003e04C \/ 1\/4\" pitch (6.35mm)\u003c\/strong\u003e roller chain. Also available: matching 1\/2\" roller chain lengths (0.5m \/ 1.5m) — select from the Specification dropdown above.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 04C Roller Chain Drive Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003ePrecision 04C Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eTooth geometry is cut to match the 6.35mm (1\/4\") pitch of standard 04C roller chain, ensuring smooth engagement and reduced chain wear over extended operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# medium-carbon steel for a reliable combination of surface hardness and core toughness — resists deformation under the cyclic loads typical of small-pitch chain drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth \u0026amp; Bore Selection\u003c\/strong\u003e\n\u003cp\u003eAvailable in 8T through 30T tooth counts with bore options from 6mm to 15mm, covering the most common shaft diameters used in go-karts, mini bikes, and DIY conveyor systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔐\u003c\/span\u003e \u003cstrong\u003eM5 Set-Screw Locking\u003c\/strong\u003e\n\u003cp\u003eAn M5 threaded set-screw port secures the sprocket directly to the shaft without requiring a keyway, simplifying installation on smooth or lightly knurled shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDirect Replacement Fit\u003c\/strong\u003e\n\u003cp\u003eDimensionally compatible with other standard 04C sprockets, making these a straightforward swap-in for worn or damaged sprockets on existing chain drive assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSold Individually — Exact Spec Selection\u003c\/strong\u003e\n\u003cp\u003eEach unit is sold as a single sprocket (or chain length where applicable). Select your exact tooth count and bore diameter from the Specification dropdown to receive the correct part.\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 — 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 (1\/4\" pitch roller chain)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e6.35mm (1\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (T)\u003c\/th\u003e\n\u003ctd\u003e8T, 10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T, 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6mm, 8mm, 10mm, 12mm, 14mm, 15mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet-Screw Thread\u003c\/th\u003e\n\u003ctd\u003eM5\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Outer Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 piece per order (chain variants sold by length)\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 10T drive sprocket paired with a 30T driven sprocket gives a 3:1 reduction — the output shaft turns at one-third the motor speed with three times the torque. For go-karts and mini bikes, common drive sprockets range from 10T to 18T depending on the desired top speed and motor RPM.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or axle shaft diameter with a caliper. The bore must match the shaft diameter exactly — a bore that is too large will allow the sprocket to wobble even with the set screw tightened. Available bores are 6mm, 8mm, 10mm, 12mm, 14mm, and 15mm. Select the bore that matches your shaft from the Specification dropdown.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat chain does this sprocket work with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese sprockets are designed for standard 04C roller chain with a 6.35mm (1\/4\") pitch. This is also commonly labeled as 25H chain in some markets. Do not use with 08B, 40, or other pitch chains — the tooth profile will not mesh correctly and will cause rapid wear or chain skipping. Matching 1\/2\" roller chain lengths are also available as a separate variant in the Specification dropdown.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# steel for chain drive use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel (equivalent to SAE 1045 carbon steel) is a widely used engineering material for sprockets and gears in light-to-medium duty applications. It offers a tensile strength typically in the range of 600–800 MPa depending on heat treatment, which is well-suited for the torque loads encountered in go-karts, mini bikes, and small conveyor systems. For heavy industrial applications with continuous high-load cycling, hardened or alloy steel sprockets would be more appropriate.\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# carbon steel will oxidize if left unprotected in humid or wet environments. For outdoor or damp applications, apply a light coat of chain lubricant or anti-rust spray to both the sprocket and chain. If corrosion resistance is a primary requirement, consider stainless steel sprockets instead. Regular lubrication of the chain drive will significantly extend the service life of both the chain and sprocket.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the set screw require a keyway on the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo keyway is required. The M5 set screw clamps directly against the shaft surface. For best holding power on smooth shafts, ensure the set screw is tightened firmly with the correct hex key (typically 3mm or 4mm). For applications with high shock loads or frequent direction reversals, a flat ground onto the shaft at the set-screw contact point will improve retention significantly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket on a motorized bicycle or e-bike?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. 04C sprockets are commonly used in motorized bicycle friction drive systems and small mid-drive reduction stages where a compact chain pitch is needed. Verify that your existing chain is 04C \/ 1\/4\" pitch and that the shaft diameter matches your selected bore before ordering. The tooth count you need will depend on your motor's output shaft size and your target gear ratio.\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 and bore diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"10T Bore 6mm","offer_id":52423244742930,"sku":"GLFBNHHHXCDZH0001x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"10T Bore 8mm","offer_id":52423244775698,"sku":"GLFBNHHHXCDZH0002x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"10T Bore 10mm","offer_id":52423244808466,"sku":"GLFBNHHHXCDZH0003x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"11T Bore 6mm","offer_id":52423244841234,"sku":"GLFBNHHHXCDZH0004x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"11T Bore 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