{"product_id":"htd-3m-timing-belt-pulley-12t-20t-step-drive-11mm","title":"HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD-3M Timing Belt Pulley — Precise 3mm Pitch Step Drive for Makers \u0026amp; Engineers\u003c\/h2\u003e\n\u003cp\u003eWhen belt slip or misalignment is costing you accuracy on your build, the right pulley makes all the difference. Whether you're a CNC hobbyist, robotics builder, or small-shop engineer, these HTD-3M step drive timing belt pulleys give you the repeatable, slip-free motion control your project demands.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a natural anodized finish, featuring an HTD (High Torque Drive) 3mm pitch tooth profile and a fixed belt width of 11mm (0.43 in). Tooth counts range from 12T to 20T, with bore options spanning 3mm to 14mm (0.12–0.55 in) to suit a wide range of shaft sizes. A set-screw hub secures the pulley firmly to the shaft.\u003c\/p\u003e\n\u003cp\u003eThese pulleys are well-suited for 3D printer X\/Y axis drives using HTD-3M belts, CNC router and laser cutter motion systems requiring precise step-per-mm calibration, and lightweight robotics or automation rigs where low backlash timing drive pulleys are essential.\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 use with HTD-3M (3mm pitch) timing belts, 11mm belt width. Verify bore diameter matches your motor or drive shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These HTD-3M Timing Belt Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷 \u003cstrong\u003e12T to 20T Tooth Range\u003c\/strong\u003e\u003cbr\u003eSeven tooth-count options (12, 14, 15, 16, 17, 18, 20 teeth) let you dial in the exact gear ratio and belt speed for your drive system.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐 \u003cstrong\u003e3mm HTD Pitch Profile\u003c\/strong\u003e\u003cbr\u003eThe HTD tooth form provides a larger contact area than trapezoidal profiles, reducing tooth load and improving torque transmission without belt skip.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩 \u003cstrong\u003eWide Bore Selection (3–14mm)\u003c\/strong\u003e\u003cbr\u003eAvailable in 3, 4, 5, 6, 6.35, 8, 10, 12, 12.7, and 14mm bores — covering standard metric shafts and common imperial sizes like 1\/4\" (6.35mm) and 1\/2\" (12.7mm).\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️ \u003cstrong\u003eStep Drive (Flanged) Design\u003c\/strong\u003e\u003cbr\u003eIntegrated flanges on both sides of the belt groove keep the belt tracking true, preventing lateral drift during high-speed or high-load operation.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚖️ \u003cstrong\u003eLightweight Aluminum Construction\u003c\/strong\u003e\u003cbr\u003eMachined aluminum alloy body keeps rotating mass low, reducing inertia for faster acceleration and deceleration in motion-control applications.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧 \u003cstrong\u003eSet-Screw Hub Retention\u003c\/strong\u003e\u003cbr\u003eEach pulley includes a set-screw bore for secure shaft mounting. Tighten against a flat on the shaft for maximum holding force and easy repositioning.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — HTD-3M Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e3mm (HTD-3M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e11mm (0.43 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e12T, 14T, 15T, 16T, 17T, 18T, 20T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e3, 4, 5, 6, 6.35, 8, 10, 12, 12.7, 14mm\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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Retention\u003c\/th\u003e\n\u003ctd\u003eSet-screw\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\u003eFlange Type\u003c\/th\u003e\n\u003ctd\u003eStep drive (double-flanged)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt\u003c\/th\u003e\n\u003ctd\u003eHTD-3M, 11mm width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e1 piece per order (multi-pack options available)\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\u003eTooth count determines your drive ratio and belt speed. A smaller pulley (e.g., 12T) on the motor paired with a larger pulley on the driven shaft reduces speed and increases torque. For 3D printers, 16T–20T on the motor is common for a good balance of speed and resolution. Match both pulleys to the same pitch (HTD-3M) for correct meshing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\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\n\u003cp\u003eMost NEMA 17 stepper motors use a 5mm shaft; NEMA 23 motors typically use an 8mm shaft. For servo motors or custom shafts, measure the shaft diameter with calipers before ordering. Common imperial sizes are also covered: 6.35mm = 1\/4\", 12.7mm = 1\/2\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with standard HTD-3M timing belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pulleys are designed specifically for HTD-3M (3mm pitch) timing belts with an 11mm belt width. Ensure your belt is also 11mm wide for proper flange clearance. Do not use with GT2 or MXL belts — the tooth profiles are not interchangeable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the set-screw connection? Will the pulley slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe set-screw provides solid retention for typical maker and light industrial loads. For maximum holding strength, align the set-screw with a flat ground on the motor shaft. In high-torque applications, consider using thread-locking compound on the set-screw. The aluminum body is rigid and does not flex under normal belt tension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these pulleys corrode or degrade over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anodized aluminum finish provides good resistance to oxidation and light corrosion in typical indoor environments. These pulleys are not rated for continuous immersion or highly corrosive atmospheres. For outdoor or humid environments, periodic inspection is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys in a 3D printer or CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — these are a popular choice for both applications. For 3D printers using HTD-3M belt drives (common on CoreXY and Cartesian designs), select the tooth count that matches your existing idler\/motor pulley setup. For CNC routers, verify the bore matches your spindle or motor shaft and that the 11mm belt width fits your belt path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between HTD and GT2 pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eHTD (High Torque Drive) uses a rounded, curvilinear tooth profile optimized for higher torque loads with reduced stress concentration. GT2 uses a modified curvilinear profile with slightly tighter tolerances, often preferred for very high-precision positioning (e.g., high-resolution 3D printers). These pulleys are HTD-3M only and are not interchangeable with GT2 belts or pulleys.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Gears (tooth count) and Bore diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"12 Teeth \/ 3mm \/ 1 Pcs","offer_id":52446085841170,"sku":"YMXS3M12TC11D3KFx1","price":6.11,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 4mm \/ 1 Pcs","offer_id":52446085873938,"sku":"YMXS3M12TC11D4KFx1","price":4.2,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 5mm \/ 1 Pcs","offer_id":52446085906706,"sku":"YMXS3M12TC11D5KFx1","price":4.2,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 6mm \/ 1 Pcs","offer_id":52446085939474,"sku":"YMXS3M12TC11D6KFx1","price":4.2,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 6.35mm \/ 1 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