{"product_id":"roller-chain-drive-sprocket-04c-25h-6-35mm-pitch-45-steel-8t-80t","title":"Roller Chain Drive Sprocket 1\/4\" 04C 8T-80T Pitch 6.35mm 45# Steel 25H Sprocket","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e#25 04C Roller Chain Sprocket — Precision 6.35mm Pitch Drive for DIY \u0026amp; Industrial Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or mismatched sprocket causes chain skip, noise, or premature wear, the entire drivetrain suffers — and so does your project timeline. Whether you're a maker building a go-kart, a hobbyist assembling a conveyor, or a technician replacing a drive component, you need a sprocket machined to tight tolerances that meshes cleanly with your #25 roller chain from the very first revolution.\u003c\/p\u003e\n\u003cp\u003eThis #25 04C roller chain sprocket is machined from 45# medium-carbon steel, offering a solid balance of hardness and toughness for demanding drive applications. The bore and hub dimensions vary by tooth count; the pitch is a fixed 6.35mm (1\/4 in) across the full 8T–80T range, with sprocket outer diameters scaling from approximately 18mm (0.71 in) at 8 teeth to roughly 163mm (6.42 in) at 80 teeth. Roller chain compatibility is #25 \/ 04C (pitch 6.35mm, roller diameter 3.30mm).\u003c\/p\u003e\n\u003cp\u003eTypical use cases include small go-kart and mini-bike final drives where a compact #25 chain sprocket keeps weight low, light-duty conveyor and indexing systems requiring precise tooth engagement, and DIY automation rigs — such as CNC axis drives or robotic arm joints — where a 6.35mm pitch roller chain sprocket delivers repeatable positioning without backlash.\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 #25 \/ 04C Roller Chain — Pitch 6.35mm (1\/4\"), Roller Diameter 3.30mm (0.130\"). Also available: matching roller chain and connecting links — select your Model above.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These #25 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\u003eStandardized #25 \/ 04C Pitch\u003c\/strong\u003e\u003cbr\u003eFixed 6.35mm (1\/4\") pitch across all tooth counts (8T–80T) ensures drop-in compatibility with any standard #25 roller chain without shimming or adjustment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from 45# steel for a tensile strength typically in the 600–800 MPa range, resisting deformation under cyclic load far better than cast iron or low-carbon alternatives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Selection (8T–80T)\u003c\/strong\u003e\u003cbr\u003eChoose from 8 to 80 teeth to dial in your exact gear ratio — whether you need high torque multiplication at low speed or a near 1:1 drive for direct coupling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eMachined Tooth Profile for Smooth Engagement\u003c\/strong\u003e\u003cbr\u003eTooth flanks are cut to ANSI\/ISO sprocket profile geometry, reducing impact load at each chain link engagement and extending both chain and sprocket service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eComplete Drive Kit in One Listing\u003c\/strong\u003e\u003cbr\u003ePair your sprocket with the matching #25 04C roller chain (0.5m–10m) and connecting links (full buckle or half buckle) — all available as Model options in this listing for a single-order drivetrain solution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e \u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e\u003cbr\u003eSuited for go-karts, mini-bikes, conveyor systems, agricultural equipment, robotics, and general-purpose mechanical drives where #25 chain is the specified standard.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — #25 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\u003e#25 \/ 04C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e6.35 mm (1\/4 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRoller Diameter\u003c\/th\u003e\n\u003ctd\u003e3.30 mm (0.130 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e8T – 80T (see variant options)\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\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ uncoated machined steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Model\u003c\/th\u003e\n\u003ctd\u003e#25 04C — Sprocket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnecting Links\u003c\/th\u003e\n\u003ctd\u003e#25 04C Full Buckle (5 PCS) \/ Half Buckle (1 PCS) — available as Model option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRoller Chain Option\u003c\/th\u003e\n\u003ctd\u003e#25 04C Roller Chain — 0.5m, 1.5m, 5m, 10m lengths available\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\u003eTooth count determines your drive ratio. Divide the driven sprocket teeth by the driver sprocket teeth to get the ratio — for example, a 10T driver paired with a 30T driven sprocket gives a 3:1 reduction. Higher tooth counts on the driven side increase torque and reduce output speed; lower counts do the opposite. For go-karts and mini-bikes, common driver sprockets range from 8T–12T; for conveyors, match the ratio to your required belt speed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with #25 and 04C roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. #25 and 04C are two designations for the same chain standard: 6.35mm (1\/4\") pitch with a 3.30mm roller diameter. This sprocket is machined to that pitch, so it meshes correctly with any #25 or 04C roller chain meeting ANSI or ISO standards. The matching roller chain and connecting links are also available as Model options in this listing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of 45# steel, and is it strong enough for my drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# medium-carbon steel typically achieves a tensile strength of 600–800 MPa in the normalized or quenched-and-tempered condition, with a surface hardness in the HRC 20–35 range depending on heat treatment. For #25 chain drives — which have a rated breaking load of approximately 3.5 kN — this material provides a substantial safety margin under normal operating loads. For high-cycle or high-shock applications, consider whether additional surface hardening is appropriate for your specific duty cycle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket rust or corrode in outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel is not inherently corrosion-resistant. In outdoor, humid, or wet environments, surface oxidation will occur over time. To extend service life, apply a light machine oil or chain lubricant to both the sprocket teeth and the roller chain regularly. For applications requiring higher corrosion resistance, consider pairing with a stainless-steel #25 chain and applying a protective coating to the sprocket, or contact us to discuss alternative material options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size does this sprocket have, and can it be re-bored?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count and is listed under the variant specifications. Many tooth-count variants ship with a pilot bore that can be machined to a custom diameter by a local machine shop to fit your shaft. If you need a specific bore size confirmed before ordering, please use the Contact Us page with your tooth count and required bore diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order the sprocket, roller chain, and connecting links together?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — this listing covers the complete #25 04C drivetrain. Use the Model selector to choose between the Sprocket (8T–80T), Roller Chain (0.5m, 1.5m, 5m, or 10m lengths), Full Buckle connecting links (pack of 5), or Half Buckle connecting links (single piece). Adding all required components from this one listing simplifies ordering and ensures chain-to-sprocket compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I determine how much roller chain length I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA common formula for chain length in links is: L = 2C\/P + (T1 + T2)\/2 + (T2 − T1)²\/(4π²C\/P), where C is center distance, P is pitch (6.35mm), T1 is driver teeth, and T2 is driven teeth. Round up to the nearest even number of links, then add one connecting link. For most small drives with center distances under 300mm, a 0.5m or 1.5m chain length is sufficient; larger conveyor runs may require the 5m or 10m option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003eModel\u003c\/strong\u003e and \u003cstrong\u003eTeeth\/meter \u0026amp; Amount\u003c\/strong\u003e above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"45# Steel \/ #25 04C - Sprocket \/ 8 Teeth \u0026 1 PCS","offer_id":52423447249170,"sku":"GYJLTHXCDZH1743x1","price":4.12,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ #25 04C - Sprocket \/ 9 Teeth \u0026 1 PCS","offer_id":52423447281938,"sku":"GYJLTHXCDZH1744x1","price":4.12,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ #25 04C - Sprocket \/ 10 Teeth \u0026 1 PCS","offer_id":52423447314706,"sku":"GYJLTHXCDZH1745x1","price":4.72,"currency_code":"USD","in_stock":true},{"title":"45# Steel \/ #25 04C - 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