{"product_id":"25-chain-drive-sprocket-9t-80t-pitch-6-35mm-for-25-04c-roller-chain","title":"#25 Chain Drive Sprocket 9T-80T Pitch 1\/4\" 6.35mm For #25 04C Roller Chain","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e#25 Chain Drive Sprocket — Precision 6.35mm Pitch for #25 \u0026amp; 04C Roller Chain\u003c\/h2\u003e\n\u003cp\u003eWhen your drivetrain demands exact tooth engagement and consistent power transfer, a mismatched sprocket creates skipping, accelerated wear, and unexpected downtime. Makers, robotics builders, go-kart enthusiasts, and light industrial assemblers who rely on #25 roller chain need a sprocket machined to the correct pitch — not an approximation. These #25 chain drive sprockets are engineered specifically for #25 (04C) roller chain with a 1\/4\" (6.35mm) pitch, available in a wide tooth range from 9T to 80T to match your exact gear ratio requirement.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from carbon steel with a natural or lightly finished surface. The bore diameter and hub dimensions vary by tooth count; refer to variant options for exact measurements. Tooth counts span 9T through 80T, covering a broad range of reduction ratios for both high-speed and high-torque applications. The 6.35mm pitch matches the ANSI #25 \/ ISO 04C chain standard precisely.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include small go-kart and mini-bike final drive assemblies, robotics and automation chain drive systems requiring compact #25 chain, conveyor and feeder mechanisms in light industrial or DIY workshop builds, and electric bicycle or motorized scooter reduction stages using #25 roller chain.\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 #25 Roller Chain \u0026amp; ISO 04C Roller Chain — Pitch 1\/4\" (6.35mm)\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These #25 Chain Drive 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 Range (9T–80T)\u003c\/strong\u003e — Choose from 14 tooth count variants to dial in your exact gear ratio, whether you need fast output or maximum torque multiplication in your #25 chain drivetrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eExact 6.35mm (1\/4\") Pitch\u003c\/strong\u003e — Machined to match the ANSI #25 \/ ISO 04C chain pitch standard, ensuring full tooth engagement and smooth chain wrap without skipping or premature wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e — Manufactured from carbon steel for reliable strength under cyclic loading, suitable for go-karts, robotics, conveyors, and other light-to-medium duty chain drive applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eConsistent Tooth Profile\u003c\/strong\u003e — Each sprocket features a machined tooth profile that conforms to standard #25 chain geometry, reducing chain articulation noise and extending chain service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e — Fits go-karts, mini bikes, electric scooters, robotics platforms, conveyor systems, and any DIY drivetrain project running #25 or 04C roller chain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eReady-to-Install Format\u003c\/strong\u003e — Sprockets are supplied individually and ready to mount. Bore and keyway details vary by tooth count — select your variant above to confirm fitment before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — #25 Chain Drive Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003eANSI #25 \/ ISO 04C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e1\/4\" (6.35mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e9T – 80T (select variant)\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\u003eBore 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\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\u003eOuter Diameter\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\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ Lightly Finished\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\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\u003eYour gear ratio is determined by dividing the driven sprocket tooth count by the drive sprocket tooth count. For example, a 9T drive sprocket paired with a 36T driven sprocket gives a 4:1 reduction. Lower tooth counts on the drive sprocket increase torque; higher tooth counts increase output speed. Select the tooth count that achieves your target ratio based on your motor RPM and desired output speed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket fit my #25 roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These sprockets are machined specifically for ANSI #25 and ISO 04C roller chain, both of which share a 1\/4\" (6.35mm) pitch. As long as your chain is a genuine #25 or 04C standard chain, the tooth profile and pitch will match correctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size does each sprocket have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count. Please refer to the individual variant listing or contact us to confirm the bore size for your selected tooth count before ordering. We recommend verifying bore diameter against your shaft size to ensure a proper fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket strong enough for go-kart or mini-bike use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese carbon steel sprockets are suitable for light-to-medium duty applications including go-karts, mini bikes, and electric scooters running #25 chain. For sustained high-load or high-speed racing applications, verify the tooth count and bore size match your drivetrain requirements and inspect the sprocket regularly for wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the sprocket include a keyway or set screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eKeyway and set screw availability varies by tooth count variant. Please select your specific tooth count above or contact us to confirm whether your chosen variant includes a keyway, set screw, or plain bore configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket with 04C chain instead of #25?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. ANSI #25 and ISO 04C are functionally equivalent standards — both use a 6.35mm (1\/4\") pitch. These sprockets are compatible with both designations. If your chain is labeled 04C, it will mesh correctly with these #25 sprockets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know if the sprocket outer diameter will clear my frame or housing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOuter diameter increases with tooth count. For clearance-critical installations, contact us with your selected tooth count and we can provide the outer diameter measurement. As a general reference, a 9T #25 sprocket has an outer diameter of approximately 20–22mm (~0.8\"), while an 80T sprocket will be significantly larger. Confirm dimensions before installation in tight enclosures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Sprocket Type (tooth count) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"#25-9T","offer_id":52423303430418,"sku":"GF2521A-0","price":4.94,"currency_code":"USD","in_stock":true},{"title":"#25-11T","offer_id":52423303463186,"sku":"GF2521A-1","price":4.94,"currency_code":"USD","in_stock":true},{"title":"#25-12T","offer_id":52423303495954,"sku":"GF2521A-2","price":5.06,"currency_code":"USD","in_stock":true},{"title":"#25-13T","offer_id":52423303528722,"sku":"GF2521A-3","price":5.49,"currency_code":"USD","in_stock":true},{"title":"#25-14T","offer_id":52423303561490,"sku":"GF2521A-4","price":5.74,"currency_code":"USD","in_stock":true},{"title":"#25-15T","offer_id":52423303594258,"sku":"GF2521A-5","price":6.96,"currency_code":"USD","in_stock":true},{"title":"#25-16T","offer_id":52423303627026,"sku":"GF2521A-6","price":6.95,"currency_code":"USD","in_stock":true},{"title":"#25-17T","offer_id":52423303659794,"sku":"GF2521A-7","price":7.68,"currency_code":"USD","in_stock":true},{"title":"#25-18T","offer_id":52423303692562,"sku":"GF2521A-8","price":8.62,"currency_code":"USD","in_stock":true},{"title":"#25-19T","offer_id":52423303725330,"sku":"GF2521A-9","price":9.11,"currency_code":"USD","in_stock":true},{"title":"#25-20T","offer_id":52423303758098,"sku":"GF2521A-10","price":9.11,"currency_code":"USD","in_stock":true},{"title":"#25-21T","offer_id":52423303790866,"sku":"GF2521A-11","price":9.36,"currency_code":"USD","in_stock":true},{"title":"#25-22T","offer_id":52423303823634,"sku":"GF2521A-12","price":10.08,"currency_code":"USD","in_stock":true},{"title":"#25-23T","offer_id":52423303856402,"sku":"GF2521A-13","price":11.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of6_637f11f4-d313-4ed8-9614-012d7f748815.jpg?v=1782734573","url":"https:\/\/homediyer.com\/products\/25-chain-drive-sprocket-9t-80t-pitch-6-35mm-for-25-04c-roller-chain","provider":"HomeDIYer","version":"1.0","type":"link"}