{"product_id":"25-roller-chain-sprocket-04c-40t-bore-8mm-30mm-pitch-6-35mm","title":"#25 Roller Chain Sprocket 04C 40T Tooth Bore 8mm-30mm Pitch 6.35mm (1\/4 inch)","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e#25 Roller Chain Sprocket 04C 40T — Precision Drive for DIY Builders \u0026amp; Engineers\u003c\/h2\u003e\n\u003cp\u003eFinding a sprocket that fits your shaft exactly — without slop, wobble, or guesswork — is one of the most frustrating parts of building a chain drive system. Whether you're a hobbyist assembling a go-kart, a maker building a conveyor, or a technician replacing worn drivetrain components, this #25 roller chain sprocket (04C, 40-tooth) gives you the dimensional precision and bore flexibility to get the job done right the first time.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from carbon steel with a natural or lightly finished surface, featuring a 40-tooth profile engineered for #25 (04C) roller chain with a pitch of 6.35 mm (1\/4 inch). Bore options range from 8 mm to 30 mm (~0.31\" to 1.18\"), with plain round bores and keyed variants (4×1.8 mm, 5×2.3 mm, and 6×2.8 mm, 8×3.3 mm keyways) available to suit standard shaft configurations.\u003c\/p\u003e\n\u003cp\u003eTypical applications include #25 chain go-kart drive systems, small conveyor belt sprocket replacements, DIY robotics and automation chain drives, and light-duty power transmission projects where a compact 1\/4-inch pitch sprocket is required. The 40-tooth count delivers a smooth, low-noise engagement ideal for moderate-speed reduction ratios.\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 \u003cstrong\u003e#25 \/ 04C roller chain\u003c\/strong\u003e with a pitch of \u003cstrong\u003e6.35 mm (1\/4\")\u003c\/strong\u003e. Verify your shaft diameter and keyway dimensions before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These #25 Roller Chain Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e40-Tooth 04C Profile\u003c\/strong\u003e\n\u003cp\u003ePrecisely cut 40-tooth geometry matches #25 \/ 04C roller chain pitch of 6.35 mm (1\/4\") for accurate, low-vibration engagement across the full tooth wrap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Bore Range: 8 mm – 30 mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in plain round bores from 8 mm to 30 mm (~0.31\" to 1.18\"), covering the most common shaft sizes used in DIY and light industrial applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e \u003cstrong\u003eKeyway Options for Positive Drive\u003c\/strong\u003e\n\u003cp\u003eSelect keyed bore variants (4×1.8 mm, 5×2.3 mm, 6×2.8 mm, or 8×3.3 mm) to lock the sprocket to your shaft and eliminate rotational slip under load.\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\u003eMachined from carbon steel for reliable strength and wear resistance in typical chain drive environments, including go-karts, conveyors, and automation rigs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Quantity Packs\u003c\/strong\u003e\n\u003cp\u003eOrder as a single piece for a one-off repair, or choose 5-pack or 10-pack quantities for project builds, spare parts inventory, or multi-axis drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDirect Drop-In Replacement\u003c\/strong\u003e\n\u003cp\u003eDimensionally consistent with standard 04C sprocket specifications, making this a reliable drop-in replacement for worn or damaged sprockets in existing #25 chain drives.\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\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\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e40T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm – 30 mm (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003ePlain bore \/ 4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 mm \/ 8×3.3 mm (See variant options)\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter (OD)\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\u003eWeight (per piece)\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 pc \/ 5 pcs \/ 10 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 if this sprocket is compatible with my chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis sprocket is designed for \u003cstrong\u003e#25 roller chain\u003c\/strong\u003e, also known as 04C chain, with a pitch of 6.35 mm (1\/4\"). Check the markings on your existing chain or measure the center-to-center distance between two adjacent pins — if it measures 6.35 mm, this sprocket is the correct match.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter with a caliper. Select the bore that matches your shaft exactly — for example, if your shaft is 12 mm, choose the 12 mm bore. If your shaft uses a key for torque transmission, select the corresponding keyway variant (e.g., 12 mm \/ 5×2.3 mm Keyway). When in doubt, a plain bore can be machined to a custom fit by a local machine shop.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway, or is a plain bore sufficient?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA plain bore is suitable for low-torque applications where the sprocket is secured with a set screw or press fit. For higher-torque drives — such as go-kart axles or motorized conveyors — a keyway bore provides a positive mechanical lock between the sprocket and shaft, preventing rotational slip under load. Check your shaft for an existing keyway slot to determine which option applies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is this sprocket under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe sprocket is machined from carbon steel, which provides solid tensile strength for light-to-moderate duty chain drive applications. Exact load ratings depend on the specific bore size and operating conditions. For heavy industrial or continuous high-speed applications, consult the chain manufacturer's load tables and match the sprocket rating to your drive requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket corrosion resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel has moderate corrosion resistance. For outdoor or humid environments, we recommend applying a light coat of chain lubricant or anti-rust spray to the sprocket surface. If your application requires stainless steel or zinc-plated variants, please contact us to confirm availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket as a direct replacement for a worn 04C 40T sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This sprocket is manufactured to standard 04C \/ #25 chain specifications, making it dimensionally compatible with most OEM and aftermarket 40-tooth sprockets of the same pitch. Match the bore size and keyway (if applicable) to your existing sprocket before ordering to ensure a drop-in fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the advantage of ordering a 5-pack or 10-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMulti-piece packs are ideal for builders running multiple drive axes, teams stocking spare parts for maintenance, or anyone who wants to keep replacement sprockets on hand. The per-unit cost decreases with larger quantities, making packs a practical choice for project builds and workshop inventory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Gears, Bore size, and Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"#25-40T \/ 8mm \/ 1","offer_id":52423296942354,"sku":"WBJHHZGLCDPJ00438x1","price":34.68,"currency_code":"USD","in_stock":true},{"title":"#25-40T \/ 10mm \/ 1","offer_id":52423296975122,"sku":"WBJHHZGLBZSJ072790x1","price":34.24,"currency_code":"USD","in_stock":true},{"title":"#25-40T \/ 12mm \/ 1","offer_id":52423297007890,"sku":"WBJHHZGLBZSJ072791x1","price":34.24,"currency_code":"USD","in_stock":true},{"title":"#25-40T \/ 14mm \/ 1","offer_id":52423297040658,"sku":"WBJHHZGLBZSJ072792x1","price":34.68,"currency_code":"USD","in_stock":true},{"title":"#25-40T \/ 15mm \/ 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