{"product_id":"45-steel-9-40-tooth-04c-chain-drive-sprocket-roller-chain-chain-connector","title":"45# Steel 9 - 40 Tooth 04C Chain Drive Sprocket-Roller Chain-Chain Connector","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e04C Chain Drive Sprocket — Precision 45# Steel for Reliable Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched sprocket brings your project to a halt, you need a drop-in replacement that fits right the first time. Makers, robotics builders, and light-industrial DIYers who work with 04C roller chain systems demand dimensional accuracy and consistent tooth geometry — and that is exactly what this 04C chain drive sprocket delivers across every tooth count and bore size in the range.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to chain drive applications. The 04C pitch (6.35 mm \/ 0.25 in) matches standard 04C roller chain. Tooth counts span 9 T through 40 T, and bore diameters range from 5 mm (approx. 0.197 in) up to 20 mm (approx. 0.787 in), including keyed-bore variants for positive shaft engagement. Matching 04C roller chain (sold by the 0.5 m or 5 m length) and both closed-loop and extension chain connectors are available as variant options on this same listing.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include small conveyor drives for DIY automation rigs, gear-reduction stages in electric go-kart and e-bike projects, and replacement sprockets for light agricultural or workshop equipment running 04C chain. Long-tail searches such as \"04C sprocket 20 tooth 8mm bore\", \"45 steel chain sprocket replacement\", and \"04C roller chain drive kit\" all point to this versatile component family.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eChain Compatibility:\u003c\/strong\u003e Designed for standard \u003cstrong\u003e04C roller chain\u003c\/strong\u003e (pitch 6.35 mm \/ 0.25 in). Verify your chain pitch and bore diameter before ordering. Roller chain and chain connectors are available as variant options on this listing.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 04C 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\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Machined from 45# steel for a practical balance of surface hardness, wear resistance, and ease of secondary machining such as keyway cutting or set-screw drilling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e04C Pitch Precision\u003c\/strong\u003e — Tooth profile and pitch (6.35 mm \/ 0.25 in) are held to standard 04C chain dimensions, ensuring smooth chain engagement and minimising noise and wear across the full tooth-count range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Selection (9 T – 40 T)\u003c\/strong\u003e — Choose the exact tooth count you need to achieve your target gear ratio without resorting to custom machining. Covers common reduction stages from high-speed motor outputs to slow-speed driven shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes Including Keyed Options\u003c\/strong\u003e — Standard round bores from 5 mm to 20 mm, plus keyed-bore variants (e.g. 10 mm 3×1.4 mm, 12 mm 4×1.8 mm, 15 mm 5×2.3 mm, 18 mm 6×2.8 mm) for positive, slip-free shaft coupling without adhesive or set screws alone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔗\u003c\/span\u003e\u003cstrong\u003eComplete Drive System in One Listing\u003c\/strong\u003e — Pair your sprocket with matching 04C roller chain (0.5 m or 5 m lengths) and closed-loop or extension chain connectors, all selectable as variants, so you can source the full drivetrain in a single order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eCompact, Lightweight Profile\u003c\/strong\u003e — The 04C sprocket series is sized for space-constrained builds. Smaller tooth counts (9–12 T) are particularly suited to motor pinions where envelope size matters, while larger counts (30–40 T) serve as driven sprockets in reduction stages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 04C Chain Drive Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003e04C (ISO\/DIN)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e6.35 mm (0.25 in)\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\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e9 T, 10 T, 11 T, 12 T, 15 T, 16 T, 17 T, 20 T, 24 T, 25 T, 30 T, 35 T, 40 T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 20 mm (round); keyed bores available — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyed Bore Options\u003c\/th\u003e\n\u003ctd\u003e10 mm (3×1.4 mm key), 12 mm (4×1.8 mm key), 14 mm (5×2.5 mm key), 15 mm (5×2.3 mm key), 16 mm (5×2.3 mm key), 17 mm (5×2.3 mm \/ 5×2.5 mm key), 18 mm (6×2.8 mm key), 19 mm (6×2.8 mm key), 20 mm (6×2.8 mm key)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Outer 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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ lightly oiled (mill finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRoller Chain Available\u003c\/th\u003e\n\u003ctd\u003e04C, 0.5 m and 5 m lengths (select as variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Connectors Available\u003c\/th\u003e\n\u003ctd\u003eClosed-loop connector; Extension connector (select as variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pcs (default); multi-pack options — see variant options\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 9 T driver paired with a 27 T driven sprocket gives a 3:1 reduction. Select a smaller tooth count on the motor side for speed reduction and torque multiplication, or match tooth counts for a 1:1 direct drive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter with a calliper and select the matching bore. For a secure, slip-free connection on a keyed shaft, choose a keyed-bore variant whose key dimensions match your shaft keyway (e.g. a 12 mm shaft with a 4×1.8 mm keyway requires the \"12mm(4×1.8mm)\" variant). For plain shafts, a round bore with a set screw is typical — drill and tap the hub after delivery if needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# medium-carbon steel has a tensile strength of approximately 600–800 MPa in the normalised condition, making it well suited to light-to-medium duty chain drives such as small conveyors, robotics, e-bikes, and workshop machinery. For heavy shock loads or continuous high-speed industrial duty, consider whether a hardened or alloy-steel sprocket is more appropriate for your specific torque and speed requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sprocket resist rust and corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe sprockets are supplied with a light mill-finish oil coating that provides short-term corrosion protection during storage and transit. For outdoor or humid environments, apply a chain lubricant or anti-rust spray regularly. If corrosion resistance is a primary requirement, consider stainless-steel sprocket alternatives or apply a suitable surface treatment after purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this sprocket with chains other than 04C?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These sprockets are machined specifically for 04C roller chain with a 6.35 mm (0.25 in) pitch. Using them with a different chain pitch — such as 25H, 35, or 06B — will result in poor engagement, accelerated wear, and potential chain derailment. Always match sprocket and chain pitch exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to buy the roller chain and connectors separately?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatching 04C roller chain and chain connectors are available as variant options directly on this listing. Select \"Roller Chain\" in the Number of Tooth dropdown and then choose your required length (0.5 m or 5 m). For connectors, select \"Chain connector (Close)\" for a closed-loop link or \"Chain connector (Open)\" for an extension link. This allows you to source the complete drive system in a single order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I determine the correct chain length for my build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUse the standard chain-length formula: L = 2C\/P + (T1+T2)\/2 + (T2−T1)²\/(4π²C\/P), where C is the centre distance, P is the chain pitch (6.35 mm), T1 is the driver tooth count, and T2 is the driven tooth count. Round up to the nearest even number of links and use a chain connector to close the loop. The 0.5 m chain option (approx. 79 links) suits short-centre drives, while the 5 m option covers longer runs or multiple cuts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Number of Tooth and Bore Width above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"9 Tooth \/ 6mm \/ 1 pcs","offer_id":52423305953554,"sku":"WSS072677x1","price":3.47,"currency_code":"USD","in_stock":true},{"title":"9 Tooth \/ 8mm \/ 1 pcs","offer_id":52423305986322,"sku":"WSS072678x1","price":3.47,"currency_code":"USD","in_stock":true},{"title":"10 Tooth \/ 5mm \/ 1 pcs","offer_id":52423306019090,"sku":"WSS072679x1","price":3.44,"currency_code":"USD","in_stock":true},{"title":"10 Tooth \/ 6mm \/ 1 pcs","offer_id":52423306051858,"sku":"WSS072680x1","price":3.55,"currency_code":"USD","in_stock":true},{"title":"10 Tooth \/ 8mm \/ 1 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