{"product_id":"gt2-10mm-timing-belt-idler-drive-pulley-20-30-tooth","title":"GT2 For 10mm Timing Belt,Idler Drive Pulley 20\/22\/24\/25\/26\/28\/30 Tooth 3-12 Bore","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eGT2 Idler Drive Pulley for 10mm Timing Belt — Precise Motion for Every DIY Build\u003c\/h2\u003e\n    \u003cp\u003eWhen your 3D printer skips steps, your CNC router loses position, or your belt-driven automation project vibrates under load, the culprit is often a poorly fitted pulley. Makers, hobbyists, and small-workshop engineers who demand repeatable, low-backlash motion need a GT2 idler drive pulley they can trust across hundreds of hours of operation.\u003c\/p\u003e\n    \u003cp\u003eThese GT2 timing belt pulleys are machined from aluminum alloy and designed specifically for 10mm-wide GT2 belts. The belt-contact width is 11mm, accommodating the belt with proper lateral clearance. Tooth counts range from 20T to 30T, and bore diameters span Φ3mm to Φ12.7mm (approximately 0.12\" to 0.50\"), with select variants featuring a keyway (K3 or K4) for positive shaft locking. Overall pulley outer diameter varies by tooth count, typically in the range of approximately 12–20mm (0.47\"–0.79\").\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include GT2 idler pulley replacement on Ender-series and Voron 3D printers, belt tensioner upgrades on desktop CNC routers and laser engravers, and drive pulley installations in custom DIY linear motion and conveyor automation systems.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for \u003cstrong\u003eGT2 profile, 10mm-wide timing belts\u003c\/strong\u003e. Verify your shaft diameter and tooth count before ordering. Keyway variants (K3\/K4) require a matching keyed shaft.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These GT2 Timing Belt Idler Drive Pulleys\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Selection (20T–30T)\u003c\/strong\u003e\u003cbr\u003e\n        Choose from 20, 22, 24, 25, 26, 28, or 30 teeth to match your drive ratio and belt wrap requirements without custom machining.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eBroad Bore Range (Φ3mm–Φ12.7mm)\u003c\/strong\u003e\u003cbr\u003e\n        Bore options from 3mm to 12.7mm (including 6.35mm \/ ¼\" for imperial shafts) cover the most common motor and shaft sizes used in DIY automation.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\n        \u003cstrong\u003eKeyway Variants Available (K3 \/ K4)\u003c\/strong\u003e\u003cbr\u003e\n        Select K3 or K4 keyway variants for positive, slip-free shaft engagement on higher-torque applications where set-screw retention alone is insufficient.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n        \u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\u003cbr\u003e\n        Lightweight yet rigid aluminum alloy body keeps rotational inertia low while resisting deformation under continuous belt tension loads.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eGT2 Profile, 11mm Belt-Contact Width\u003c\/strong\u003e\u003cbr\u003e\n        Machined to the GT2 tooth profile standard with an 11mm-wide belt groove, ensuring smooth, low-noise engagement with standard 10mm GT2 belts.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eIdler \u0026amp; Drive Configurations\u003c\/strong\u003e\u003cbr\u003e\n        Suitable for use as both a drive pulley (motor shaft) and an idler\/tensioner pulley, giving you flexibility across different positions in your belt system.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — GT2 Timing Belt Pulley\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eBelt Profile\u003c\/th\u003e\n\u003ctd\u003eGT2\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBelt-Contact Width (Pulley)\u003c\/th\u003e\n\u003ctd\u003e11mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e20T \/ 22T \/ 24T \/ 25T \/ 26T \/ 28T \/ 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003eΦ3 \/ 4 \/ 5 \/ 6 \/ 6.35 \/ 8 \/ 10 \/ 12 \/ 12.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003eNone (standard) \/ K3 \/ K4 (select variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum Alloy\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\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Pitch\u003c\/th\u003e\n\u003ctd\u003e2mm (GT2)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ machined\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 piece per order\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right tooth count for my build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eTooth count determines the effective pitch diameter and, combined with your motor pulley, sets your drive ratio. For most 3D printers and light CNC routers, 20T is the standard drive pulley size. Higher tooth counts (24T–30T) are used when you need a larger pitch diameter, reduced belt wrap angle on an idler, or a specific gear ratio in a multi-pulley system. Match the tooth count to your design's geometry requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore size should I select for my stepper motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMost NEMA 17 stepper motors have a 5mm shaft, so Φ5mm is the most common choice for drive pulleys. NEMA 23 motors typically use an 8mm shaft. If you are using an imperial shaft (e.g., ¼\" = 6.35mm), select the Φ6.35mm bore variant. Always measure your shaft diameter with calipers before ordering to confirm the correct bore.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the standard and keyway (K3\/K4) variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStandard variants use one or two set screws to secure the pulley to the shaft. Keyway variants (K3 or K4) include a machined keyway slot that accepts a matching key on the shaft, providing a positive mechanical lock that prevents rotational slipping under higher torque loads. Use keyway variants when set-screw retention is insufficient for your application's torque demands.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these pulleys compatible with 2GT and GT2 belts interchangeably?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The GT2 and 2GT tooth profiles are functionally identical and fully interchangeable. These pulleys will mesh correctly with any standard GT2 \/ 2GT timing belt with a 2mm pitch. Ensure the belt width matches — these pulleys are designed for 10mm-wide belts.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these as idler pulleys without a shaft bore?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese are toothed pulleys intended to engage the belt's tooth profile. When used as an idler, select a bore that fits your idler bolt or bearing shaft. For smooth idler applications (where the belt runs on the outside of a flanged bearing), a different flat idler pulley is typically used. These toothed variants are best suited as driven idlers or tensioners where tooth engagement is desired.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat material are these pulleys made from, and will they corrode?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese pulleys are machined from aluminum alloy, which offers a favorable strength-to-weight ratio and natural corrosion resistance in typical indoor environments. For applications exposed to moisture, humidity, or mild chemicals, the natural oxide layer on aluminum provides adequate protection. Avoid prolonged exposure to strong acids or alkalis, which can degrade aluminum surfaces over time.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pulleys are included per order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach order includes \u003cstrong\u003e1 piece\u003c\/strong\u003e. If your project requires multiple pulleys (e.g., a CoreXY printer with two drive pulleys and several idlers), please add the required quantity to your cart or place multiple orders for different size variants as needed.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat should I check before installing the pulley on my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBefore installation, verify that the bore diameter matches your shaft diameter (a snug but not forced fit is ideal), confirm the tooth count matches your belt system's design, and check that the belt width (10mm) matches your existing belt. For keyway variants, ensure your shaft has a matching keyway cut. Tighten set screws (standard variants) against a flat on the motor shaft where possible to prevent slipping.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your tooth count and bore diameter above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right tooth count for my build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Tooth count determines the effective pitch diameter and drive ratio. For most 3D printers and light CNC routers, 20T is standard. Higher tooth counts (24T–30T) are used for larger pitch diameters or specific gear ratios. Match the tooth count to your design's geometry requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for my stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Most NEMA 17 stepper motors have a 5mm shaft. NEMA 23 motors typically use an 8mm shaft. For imperial shafts (¼\\\" = 6.35mm), select the Φ6.35mm bore variant. Always measure your shaft diameter with calipers before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the standard and keyway (K3\/K4) variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard variants use set screws to secure the pulley. Keyway variants (K3\/K4) include a machined keyway slot for a positive mechanical lock, preventing rotational slipping under higher torque loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these pulleys compatible with 2GT and GT2 belts interchangeably?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. GT2 and 2GT tooth profiles are functionally identical and fully interchangeable. These pulleys mesh correctly with any standard GT2\/2GT timing belt with a 2mm pitch and 10mm width.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What material are these pulleys made from, and will they corrode?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These pulleys are machined from aluminum alloy, offering a favorable strength-to-weight ratio and natural corrosion resistance in typical indoor environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pulleys are included per order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each order includes 1 piece. Add the required quantity to your cart or place multiple orders for different size variants as needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What should I check before installing the pulley on my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Verify the bore diameter matches your shaft, confirm the tooth count matches your belt system, and check that the belt width (10mm) matches your belt. For keyway variants, ensure your shaft has a matching keyway. Tighten set screws against a flat on the motor shaft where possible.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"20T Width11mm Bore Φ3mm","offer_id":52446325080338,"sku":"YSS2GT20TC11D3AFx1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"20T Width11mm Bore Φ4mm","offer_id":52446325113106,"sku":"YSS2GT20TC11D4AFx1","price":3.33,"currency_code":"USD","in_stock":true},{"title":"20T Width11mm Bore Φ5mm","offer_id":52446325145874,"sku":"YSS2GT20TC11D5AFx1","price":3.33,"currency_code":"USD","in_stock":true},{"title":"20T Width11mm Bore Φ6mm","offer_id":52446325178642,"sku":"YSS2GT20TC11D6AFx1","price":3.33,"currency_code":"USD","in_stock":true},{"title":"20T Width11mm Bore Φ6.35mm","offer_id":52446325211410,"sku":"YSS2GT20TC11D6.35AFx1","price":3.33,"currency_code":"USD","in_stock":true},{"title":"20T Width11mm Bore 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