{"product_id":"simplex-sprocket-wheel-25-04c-roller-chain-9t-30t-pitch-635mm","title":"Simplex Sprocket Wheel for #25 (04C) Roller Chain, 9T-30T, Pitch 1\/4\" （6.35mm）","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e#25 Roller Chain Sprocket Wheel — Precision-Cut Simplex Drive for 6.35mm Pitch Chain\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized sprocket causes your #25 roller chain to skip, stretch prematurely, or jump under load, the entire drive system loses efficiency — and downtime follows. Makers, robotics builders, go-kart enthusiasts, and light-industrial maintenance teams who rely on ANSI #25 (ISO 04C) chain need a sprocket that holds tight tooth engagement across every revolution.\u003c\/p\u003e\n\u003cp\u003eThis simplex sprocket wheel is machined to suit #25 (04C) roller chain with a standardized pitch of 1\/4 inch (6.35 mm). Available in tooth counts from 9T through 30T, outer diameters range from approximately 21.5 mm (~0.85 in) for the 9T up to 63.5 mm (~2.50 in) for the 30T. The bore is finished for standard shaft fitment; confirm your shaft diameter against the variant listing before ordering.\u003c\/p\u003e\n\u003cp\u003eTypical applications include small go-kart and mini-bike final drives, robotics and automation chain-drive stages, conveyor indexing systems using #25 chain, and DIY power-transmission projects requiring a compact, low-pitch sprocket. The compact outer diameter range makes these sprockets well-suited for tight-clearance enclosures and multi-stage reduction gearboxes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for ANSI #25 \/ ISO 04C simplex roller chain — Pitch: 1\/4 inch (6.35 mm) | Roller diameter: 3\/16 inch (4.76 mm) | Chain width: 3\/16 inch (4.76 mm). Not compatible with duplex or triplex chain.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These #25 Roller Chain Sprocket Wheels\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 Tooth Profile\u003c\/strong\u003e\u003cbr\u003eTooth geometry conforms to ANSI #25 and ISO 04C chain standards, ensuring consistent engagement and reduced chain wear across the full 9T–30T range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Selection (9T–30T)\u003c\/strong\u003e\u003cbr\u003eTwenty-two tooth-count options let you dial in your exact gear ratio without custom machining — from the compact 9T (OD ≈ 21.5 mm) to the larger 30T (OD ≈ 63.5 mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Surface Treatment\u003c\/strong\u003e\u003cbr\u003eThe sprocket surface is treated to resist oxidation in moderately humid workshop and light-outdoor environments, extending service life between maintenance intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003eFlexible Quantity Options (1, 2, 5, or 10 pcs)\u003c\/strong\u003e\u003cbr\u003eOrder a single replacement piece or stock up with a 10-pack for ongoing projects — quantity pricing is reflected in the variant selector above.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eCompact OD for Tight-Clearance Builds\u003c\/strong\u003e\u003cbr\u003eThe smallest variants (9T–12T, OD 21.5–27.5 mm \/ 0.85–1.08 in) fit inside confined enclosures where larger sprockets cannot, making them ideal for compact robotics and mini-drive assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e\u003cbr\u003eTooth pitch and roller-seating dimensions match standard #25 chain, so these sprockets serve as direct replacements in existing drive systems without modifying chain length or center distance.\u003c\/li\u003e\n\u003c\/ul\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 \/ ISO 04C Simplex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e1\/4 inch (6.35 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRoller Diameter\u003c\/th\u003e\n\u003ctd\u003e3\/16 inch (4.76 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e9T – 30T (22 options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e21.5 mm – 63.5 mm (0.85 – 2.50 in)\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eOxidation-resistant finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Type Compatibility\u003c\/th\u003e\n\u003ctd\u003eSimplex (single-strand) only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 2 PCS \/ 5 PCS \/ 10 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eRoller Chain Sprocket\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 driver sprocket teeth to get the reduction ratio. For example, a 9T driver paired with a 27T driven sprocket gives a 3:1 reduction. Smaller tooth counts produce higher speed at the output shaft; larger tooth counts increase torque. Match the outer diameter to your available center distance and chain length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket fit my existing #25 roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — provided your chain is ANSI #25 or ISO 04C simplex (single-strand) with a 6.35 mm pitch and a 4.76 mm roller diameter. These are the most common #25 chain dimensions. If your chain is duplex (#25-2) or triplex (#25-3), this sprocket is not compatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter does this sprocket have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count and is listed in the individual variant details. Please check the variant description or contact us to confirm the bore size before ordering, especially if you need a specific shaft fit (e.g., 6 mm, 8 mm, or 10 mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket suitable for outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe surface treatment provides moderate resistance to oxidation and is suitable for typical workshop conditions and light-outdoor use. For continuous outdoor exposure or wet environments, we recommend applying a chain lubricant regularly and inspecting the sprocket periodically for surface wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is this sprocket — what load can it handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eANSI #25 chain and matching sprockets are rated for light-duty to medium-duty applications. The #25 chain has a typical breaking load of approximately 3.1 kN (700 lbf). Actual working load capacity depends on speed, lubrication, and the number of teeth in engagement. For heavy-duty or high-cycle applications, consider upgrading to #35 or #40 chain and sprockets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket in a multi-stage reduction gearbox?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The compact outer diameters of the smaller tooth-count variants (9T–14T, OD 21.5–31.5 mm) make them well-suited for multi-stage chain-drive reductions in robotics, go-karts, and DIY gearboxes. Ensure adequate center distance between stages and use a chain tensioner if the chain slack cannot be managed by adjusting center distance alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy should I buy a multi-pack (5 or 10 pcs) instead of a single sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMulti-packs offer a lower per-unit cost and ensure you have spares on hand for ongoing projects or production runs. If you are building multiple identical assemblies or maintaining a fleet of machines, stocking 5 or 10 pieces reduces reorder frequency and keeps your build schedule on track.\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 and Outer Diameter \u0026amp; Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"#25 - 9T \/ 1\/4 inch (6.35mm) \/ 21.5mm \u0026 1PCS","offer_id":52423395770642,"sku":"GYJLTSHXJZC2758x1","price":1.5,"currency_code":"USD","in_stock":true},{"title":"#25 - 10T \/ 1\/4 inch (6.35mm) \/ 23.5mm \u0026 1PCS","offer_id":52423395803410,"sku":"GYJLTSHXJZC2759x1","price":4.18,"currency_code":"USD","in_stock":true},{"title":"#25 - 11T \/ 1\/4 inch (6.35mm) \/ 25.5mm \u0026 1PCS","offer_id":52423395836178,"sku":"GYJLTSHXJZC2760x1","price":4.72,"currency_code":"USD","in_stock":true},{"title":"#25 - 12T \/ 1\/4 inch (6.35mm) \/ 27.5mm \u0026 1PCS","offer_id":52423395868946,"sku":"GYJLTSHXJZC2761x1","price":4.72,"currency_code":"USD","in_stock":true},{"title":"#25 - 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