{"product_id":"25-chain-sprocket-9t-tooth-bore-5mm-6-35mm-pitch-6-35mm-for-25-roller-chain","title":"#25 Chain Sprocket 9T Tooth Bore 5mm - 6.35mm Pitch 6.35mm for #25 Roller Chain","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e#25 Roller Chain Sprocket 9T — Precision 6.35mm Pitch Drive Component for Compact Builds\u003c\/h2\u003e\n\u003cp\u003eWhen your small-scale drivetrain demands exact tooth engagement and zero slop, a mismatched sprocket becomes the weakest link in the system. Makers, robotics builders, and automation hobbyists working with #25 roller chain need a sprocket that holds tight tolerances across every bore size — whether you're mounting to a 5mm motor shaft or a 6.35mm (1\/4\") keyed axle.\u003c\/p\u003e\n\u003cp\u003eThis #25 chain sprocket features 9 teeth and a 6.35mm pitch, machined to match ANSI #25 roller chain geometry. The hub is available in four bore diameters — 5mm, 6mm, 6.35mm, and 8mm — spanning approximately 5–8mm (0.197\"–0.315\"). The sprocket body is constructed from carbon steel with a natural or lightly treated finish, offering solid wear resistance for indoor and light-duty outdoor drive applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include small conveyor drives, robotics joint actuators, go-kart throttle linkages, and DIY chain-drive transmission builds where a compact 9-tooth sprocket keeps the drive ratio tight and the package size minimal. The #25 chain sprocket 9T is also a go-to for educators and prototypers building chain-drive demonstration rigs or iterating on custom gearbox designs.\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 (6.35mm \/ 1\/4\" pitch) — verify bore diameter matches your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These #25 Chain Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eANSI #25 Standard Geometry\u003c\/strong\u003e\n\u003cp\u003eTooth profile and pitch (6.35mm) are machined to ANSI #25 roller chain specifications, ensuring smooth engagement and consistent chain wrap across the 9-tooth count.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eFour Bore Options in One Listing\u003c\/strong\u003e\n\u003cp\u003eChoose from 5mm, 6mm, 6.35mm (1\/4\"), or 8mm bore to match your motor shaft, axle, or drive rod — no adapter sleeve required for standard shaft sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eThe sprocket body is made from carbon steel, delivering the hardness and wear resistance needed for sustained chain contact under moderate load cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Quantity Tiers\u003c\/strong\u003e\n\u003cp\u003eAvailable in packs of 1, 2, 5, 10, 25, or 50 pieces — order a single unit for prototyping or stock up in bulk for production runs and repair inventory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eCompact 9-Tooth Drive Ratio\u003c\/strong\u003e\n\u003cp\u003eA 9-tooth driver sprocket enables high reduction ratios when paired with a larger driven sprocket, making it ideal for torque-multiplying applications in small robotics and automation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement Compatibility\u003c\/strong\u003e\n\u003cp\u003eDimensionally consistent with standard #25 sprocket hubs — fits existing chain drive assemblies without modification to chain length or frame geometry in most applications.\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 — #25 Roller Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003eANSI #25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e9T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e6.35mm (1\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e5mm \/ 6mm \/ 6.35mm \/ 8mm\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\u003eFinish\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\u003eSetscrew \/ Keyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eTypically 18–20mm (0.71\"–0.79\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eTypically 20–23mm (0.79\"–0.91\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Length (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 5 \/ 10 \/ 25 \/ 50 pcs\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 know which bore size to choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of your motor shaft or axle with a caliper. Match that measurement to the available bore options: 5mm, 6mm, 6.35mm (1\/4\"), or 8mm. If your shaft is slightly undersized, a setscrew or keyway can compensate — check your hub style before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with #25H (heavy) roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis sprocket is designed for standard ANSI #25 roller chain with a 6.35mm pitch. #25H chain shares the same pitch but has thicker side plates. The tooth profile will engage correctly, but verify your chain's roller diameter matches the sprocket's tooth gap before running under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can this 9-tooth sprocket handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAs a carbon steel #25 sprocket, it is suited for light-to-moderate duty applications. ANSI #25 chain has a working load of approximately 100–140 lbf (445–623 N) depending on chain grade. The 9-tooth count means fewer teeth in contact at any moment, so keep operating loads within the chain's rated working load and avoid shock loading.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket rust or corrode in outdoor use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel sprockets are susceptible to surface oxidation in humid or wet environments. For outdoor or washdown applications, apply a light machine oil or chain lubricant regularly. If corrosion resistance is a primary requirement, consider a stainless steel sprocket variant instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket with a keyed shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eKeyway availability depends on the specific variant. Check the variant options for hub style details. If a keyway is not listed, the bore is typically held by a setscrew. Contact us to confirm keyway dimensions if your application requires a specific key size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy buy in bulk quantities (10, 25, or 50 pcs)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBulk packs offer a lower per-unit cost and ensure you have replacement sprockets on hand for maintenance cycles. For production builds, robotics teams, or repair shops running multiple #25 chain drive systems, stocking spare sprockets prevents costly downtime when a tooth wears or a bore becomes damaged.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 04C and #25 chain designation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e04C is the ISO\/metric designation for the same chain standard that ANSI calls #25. Both share a 6.35mm pitch and compatible roller dimensions. This sprocket (listed as 04C 9T) is fully interchangeable with ANSI #25 chain in standard drive configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Type, Bore, and Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"04C 9T \/ 5mm \/ 1","offer_id":52423360413970,"sku":"SSZXYGLBZSJ072676x1","price":17.35,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6mm \/ 1","offer_id":52423360446738,"sku":"SSZXYGLBZSJ072677x1","price":17.35,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 8mm \/ 1","offer_id":52423360479506,"sku":"SSZXYGLBZSJ072678x1","price":17.35,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6.35mm \/ 1","offer_id":52423360512274,"sku":"SSZXYGLCDPJ00182x1","price":17.35,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 5mm \/ 2","offer_id":52423360545042,"sku":"SSZXYGLBZSJ072676x2","price":27.15,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6mm \/ 2","offer_id":52423360577810,"sku":"SSZXYGLBZSJ072677x2","price":27.15,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 8mm \/ 2","offer_id":52423360610578,"sku":"SSZXYGLBZSJ072678x2","price":27.15,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6.35mm \/ 2","offer_id":52423360643346,"sku":"SSZXYGLCDPJ00182x2","price":27.15,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 5mm \/ 5","offer_id":52423360676114,"sku":"SSZXYGLBZSJ072676x5","price":62.29,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6mm \/ 5","offer_id":52423360708882,"sku":"SSZXYGLBZSJ072677x5","price":62.29,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 8mm \/ 5","offer_id":52423360741650,"sku":"SSZXYGLBZSJ072678x5","price":62.29,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6.35mm \/ 5","offer_id":52423360774418,"sku":"SSZXYGLCDPJ00182x5","price":62.29,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 5mm \/ 10","offer_id":52423360807186,"sku":"SSZXYGLBZSJ072676x10","price":120.71,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6mm \/ 10","offer_id":52423360839954,"sku":"SSZXYGLBZSJ072677x10","price":120.71,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 8mm \/ 10","offer_id":52423360872722,"sku":"SSZXYGLBZSJ072678x10","price":120.71,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6.35mm \/ 10","offer_id":52423360905490,"sku":"SSZXYGLCDPJ00182x10","price":120.71,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 5mm \/ 25","offer_id":52423360938258,"sku":"SSZXYGLBZSJ072676x25","price":295.66,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6mm \/ 25","offer_id":52423360971026,"sku":"SSZXYGLBZSJ072677x25","price":295.66,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 8mm \/ 25","offer_id":52423361003794,"sku":"SSZXYGLBZSJ072678x25","price":295.66,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6.35mm \/ 25","offer_id":52423361036562,"sku":"SSZXYGLCDPJ00182x25","price":295.66,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 5mm \/ 50","offer_id":52423361069330,"sku":"SSZXYGLBZSJ072676x50","price":587.47,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6mm \/ 50","offer_id":52423361102098,"sku":"SSZXYGLBZSJ072677x50","price":587.47,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 8mm \/ 50","offer_id":52423361134866,"sku":"SSZXYGLBZSJ072678x50","price":587.47,"currency_code":"USD","in_stock":true},{"title":"04C 9T \/ 6.35mm \/ 50","offer_id":52423361167634,"sku":"SSZXYGLCDPJ00182x50","price":587.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-02_a586f1fe-c2f5-4a0a-833c-f3b17d4ea679.jpg?v=1782821502","url":"https:\/\/homediyer.com\/products\/25-chain-sprocket-9t-tooth-bore-5mm-6-35mm-pitch-6-35mm-for-25-roller-chain","provider":"HomeDIYer","version":"1.0","type":"link"}