{"product_id":"black-45-steel-roller-chain-drive-sprocket-gear-1-4-inch-9-14-teeth-with-steps","title":"Black 45# Steel Roller Chain Drive Sprocket Gear 1\/4 inch 9-14 Teeth with Steps","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e45# Steel Roller Chain Drive Sprocket — Reliable Power Transmission for DIY Builders\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized sprocket causes chain skip, vibration, or premature wear on your drive system, finding an exact-fit replacement becomes urgent. This 45# steel roller chain drive sprocket is designed for makers, hobbyists, and repair technicians who need a dependable, dimensionally accurate sprocket without sourcing from an OEM. Available in 9 through 14 tooth counts, it suits a wide range of speed-ratio requirements in compact drive assemblies.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# medium-carbon steel and finished with a black oxide coating for corrosion resistance. The stepped hub design accommodates bore diameters of 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm (approximately 0.197\"–0.472\"), making it compatible with common motor and shaft sizes. The chain pitch is 1\/4 inch (6.35 mm), matching standard #25 roller chain.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include go-kart and mini-bike drive trains requiring a 9–14T front sprocket, small conveyor systems where a compact stepped-hub sprocket simplifies shaft mounting, and DIY robotics or automation rigs that run #25 roller chain for precise torque transfer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with standard \u003cstrong\u003e#25 roller chain (1\/4\" \/ 6.35 mm pitch)\u003c\/strong\u003e. Bore options: 5 mm, 6 mm, 8 mm, 10 mm, 12 mm. Select teeth count and bore diameter from the variant options above.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Roller Chain Drive Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# steel for a balance of hardness and toughness, resisting deformation under cyclic chain loads in continuous-duty applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e \u003cstrong\u003eBlack Oxide Finish\u003c\/strong\u003e\n\u003cp\u003eThe black oxide surface treatment reduces surface friction and provides a baseline level of corrosion resistance suitable for indoor and sheltered outdoor environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eStepped Hub for Secure Shaft Engagement\u003c\/strong\u003e\n\u003cp\u003eThe integrated stepped hub allows the sprocket to seat firmly against a shaft shoulder, reducing axial movement and simplifying alignment during assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e \u003cstrong\u003e9–14 Tooth Range for Flexible Gear Ratios\u003c\/strong\u003e\n\u003cp\u003eSix tooth-count options let you dial in the drive ratio for your specific speed and torque requirements without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e \u003cstrong\u003eMultiple Bore Sizes (5–12 mm)\u003c\/strong\u003e\n\u003cp\u003eFive bore diameter options — 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm — cover the most common motor output shaft and axle sizes used in small-scale drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1, 2, 3, 5, or 10 pieces per transaction to match your project needs, whether you are replacing a single sprocket or stocking spares for a fleet of machines.\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 — Roller Chain Drive Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e1\/4 inch (6.35 mm) — #25 Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e9 T, 10 T, 11 T, 12 T, 13 T, 14 T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e5 mm, 6 mm, 8 mm, 10 mm, 12 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped Hub\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\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\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 Pcs, 2 Pcs, 3 Pcs, 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 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's tooth count by the drive sprocket's tooth count to get the ratio. A lower tooth count on the drive sprocket increases torque at the output but reduces speed. For go-karts and mini-bikes, 9–11 T drive sprockets are common for higher top-end speed, while 12–14 T suits lower-speed, higher-torque setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore diameter should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor output shaft or axle diameter with a caliper. Match it to the available bore options: 5 mm, 6 mm, 8 mm, 10 mm, or 12 mm. If your shaft falls between sizes, the bore can typically be enlarged by a machine shop, but it cannot be reduced. When in doubt, choose the bore that matches your shaft exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with #25 roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This sprocket is designed for standard #25 roller chain with a 1\/4 inch (6.35 mm) pitch. Verify that your existing chain is #25 before ordering. Using a mismatched chain pitch will cause rapid wear and potential chain derailment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# steel for drive sprocket applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# medium-carbon steel has a typical tensile strength of approximately 600–700 MPa after standard heat treatment, making it well-suited for moderate-load drive applications such as go-karts, small conveyors, and robotics. For very high-shock or heavy industrial loads, consider a hardened or alloy-steel sprocket instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the black oxide finish prevent rust outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBlack oxide provides light corrosion resistance and is best suited for indoor or sheltered environments. For outdoor or wet conditions, apply a light coat of chain lubricant or anti-rust spray to the sprocket surface after installation. This significantly extends service life in humid or exposed environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the stepped hub do and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe stepped hub creates a shoulder that the sprocket seats against on the shaft, preventing axial (side-to-side) movement during operation. This simplifies alignment, reduces the need for additional retaining hardware in many setups, and helps maintain consistent chain tension over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a set screw or keyway with this sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe bore is machined as a plain bore. Whether a set screw flat or keyway is present depends on the specific variant — please contact us to confirm before ordering if your application requires a keyed or set-screw bore. For plain-bore mounting, a shaft collar or retaining ring on the shaft is recommended to secure axial position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Teeth count, Bore Diameter, and Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"9 T \/ 5mm \/ 1 Pcs","offer_id":52423283966226,"sku":"BGMSHXJZC3060x1","price":6.72,"currency_code":"USD","in_stock":true},{"title":"9 T \/ 5mm \/ 2 Pcs","offer_id":52423283998994,"sku":"BGMSHXJZC3060x2","price":10.01,"currency_code":"USD","in_stock":true},{"title":"9 T \/ 5mm \/ 3 Pcs","offer_id":52423284031762,"sku":"BGMSHXJZC3060x3","price":13.95,"currency_code":"USD","in_stock":true},{"title":"9 T \/ 5mm \/ 5 Pcs","offer_id":52423284064530,"sku":"BGMSHXJZC3060x5","price":22.07,"currency_code":"USD","in_stock":true},{"title":"9 T \/ 5mm \/ 10 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