{"product_id":"04c-roller-chain-sprocket-10t-30t-635mm-pitch-45-steel","title":"45# Steel Roller Chain Sprockets 10T - 30T Pitch 1\/4\" 6.35mm 04C Drive Sprocket","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e04C Roller Chain Sprockets — Precision 45# Steel Drive Sprockets for 1\/4\" Pitch Chain\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or worn sprocket brings your conveyor, go-kart, mini-bike, or small machinery to a halt, finding an exact-fit replacement in the right tooth count and bore diameter is the real challenge. These 04C drive sprockets are engineered for makers, hobbyists, and maintenance technicians who need a dimensionally accurate, drop-in solution for standard #04C (1\/4\" pitch) roller chain systems.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# carbon steel, offering a solid balance of hardness and machinability. The pitch is 6.35mm (1\/4\"), conforming to the ISO 04C \/ ANSI 25 chain standard. Tooth counts range from 10T to 30T, and bore diameters span 5mm to 16mm (~0.197\" to 0.630\"), covering the most common shaft sizes used in light-duty drivetrain applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include go-kart and mini-bike final drive replacement, small conveyor and feeder mechanism upgrades, robotics and automation prototype builds requiring a compact 04C chain drive sprocket, and DIY power transmission projects where a keyed or plain bore 6.35mm pitch sprocket is specified.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e\n\u003cstrong\u003eChain Compatibility:\u003c\/strong\u003e Designed for ISO 04C \/ ANSI 25 roller chain — pitch 6.35mm (1\/4\"). Not compatible with 08B, #35, #40, or other pitch chains.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 04C Drive 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 (10T–30T)\u003c\/strong\u003e\u003cbr\u003eNineteen tooth count options from 10 to 30 teeth let you dial in the exact gear ratio your drivetrain requires — whether you need a fast-spinning driver or a torque-multiplying driven sprocket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes (5–16mm)\u003c\/strong\u003e\u003cbr\u003eAvailable in nine bore diameters — 5, 6, 7, 8, 10, 12, 14, 15, and 16mm — to match common shaft sizes in go-karts, conveyors, and small machinery without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eManufactured from 45# medium-carbon steel, these sprockets offer reliable hardness and wear resistance for sustained light-to-medium duty cycling loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eISO 04C \/ ANSI 25 Standard Pitch\u003c\/strong\u003e\u003cbr\u003eThe 6.35mm (1\/4\") pitch conforms to the ISO 04C and ANSI 25 chain standard, ensuring dimensional interchangeability with any compliant #04C roller chain on the market.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eConsistent Tooth Profile for Smooth Engagement\u003c\/strong\u003e\u003cbr\u003eTooth geometry is machined to standard involute profile tolerances, promoting smooth chain engagement, reduced vibration, and even load distribution across all teeth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eReady for Keyway or Set-Screw Modification\u003c\/strong\u003e\u003cbr\u003eThe plain bore design is suitable for direct shaft press-fit or can be machined to accept a keyway or set-screw for positive torque transmission in your specific application.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\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\u003eISO 04C \/ ANSI 25\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 Options\u003c\/th\u003e\n\u003ctd\u003e10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 28T, 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 15mm, 16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# 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 Style\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003ePlain bore (field-machinable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall 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\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eGo-kart, mini-bike, conveyor, robotics, light machinery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\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\u003cp\u003eThe tooth count determines your drive ratio. Divide the driven sprocket teeth by the driver sprocket teeth to get the reduction ratio. For example, a 10T driver paired with a 30T driven sprocket gives a 3:1 reduction — tripling torque while reducing speed by two-thirds. Match your required output speed and torque to select the correct combination.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore diameter should I select for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper and select the matching bore size. Available bores are 5, 6, 7, 8, 10, 12, 14, 15, and 16mm. If your shaft is imperial (e.g., 3\/8\" = 9.525mm), choose the nearest metric bore and plan to machine a keyway or use a set-screw collar for a secure fit.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with ANSI #25 chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The ISO 04C standard and ANSI 25 standard both specify a 6.35mm (1\/4\") pitch, making these sprockets dimensionally interchangeable with any compliant #25 or #04C roller chain. Always verify the chain's inner width and roller diameter match the sprocket tooth profile before installation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# carbon steel for sprocket use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel (equivalent to SAE 1045) has a typical tensile strength of approximately 600–700 MPa in the as-machined condition. It is well-suited for light-to-medium duty cycling loads such as go-karts, small conveyors, and robotics. For heavy-duty industrial applications with shock loads, consider a hardened or alloy steel sprocket.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDoes this sprocket resist corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has moderate corrosion resistance. For outdoor or humid environments, apply a light coat of chain lubricant or anti-rust spray to the sprocket surface. If long-term corrosion resistance is critical, consider a zinc-plated or stainless steel alternative for your application.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I machine a keyway into the plain bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The plain bore design is intentionally left unfinished to allow field machining. A standard broach or CNC mill can cut a keyway to your required DIN or ANSI key specification. Ensure the hub wall thickness is sufficient for your keyway depth before machining — refer to the hub dimensions for your selected tooth count.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the pitch circle diameter for a given tooth count?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pitch circle diameter (PCD) for a 04C sprocket is calculated as: PCD = Pitch ÷ sin(180° ÷ T), where Pitch = 6.35mm and T = number of teeth. For example, a 20T sprocket has a PCD of approximately 6.35 ÷ sin(9°) ≈ 40.6mm (~1.60\"). Use this formula to verify clearance in your assembly before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Model (tooth count) and Bore Diameter above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"04C - 10 Teeth \/ Bore 5mm \/ 1 Pcs","offer_id":52423415365906,"sku":"QTLJJGJXCD0717x1","price":2.49,"currency_code":"USD","in_stock":true},{"title":"04C - 10 Teeth \/ Bore 6mm \/ 1 Pcs","offer_id":52423415398674,"sku":"QTLJJGJXCD0718x1","price":2.49,"currency_code":"USD","in_stock":true},{"title":"04C - 10 Teeth \/ Bore 7mm \/ 1 Pcs","offer_id":52423415431442,"sku":"QTLJJGJXCD0719x1","price":2.49,"currency_code":"USD","in_stock":true},{"title":"04C - 10 Teeth \/ Bore 8mm \/ 1 Pcs","offer_id":52423415464210,"sku":"QTLJJGJXCD0720x1","price":2.49,"currency_code":"USD","in_stock":true},{"title":"04C - 10 Teeth \/ Bore 10mm \/ 1 Pcs","offer_id":52423415496978,"sku":"QTLJJGJXCD0721x1","price":2.49,"currency_code":"USD","in_stock":true},{"title":"04C - 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