{"product_id":"htd-3m-45t-150t-timing-belt-pulley-pitch-3mm-step-drive-width-11mm","title":"HTD-3M 45T-150T Timing Belt Pulley Pitch 3mmm With Step Drive Pulleys Width 11mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003ch2\u003eHTD-3M Timing Belt Pulleys — Precise Power Transmission for DIY \u0026amp; CNC Drives\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003cp\u003eWhen your motion system slips, skips, or loses sync, the culprit is often an undersized or mismatched pulley. Engineers, makers, and CNC hobbyists who demand repeatable, backlash-free motion need a timing belt pulley that locks onto the shaft cleanly and meshes with the belt without play. The HTD-3M timing belt pulley series is engineered for exactly that — delivering consistent, slip-free power transfer across a wide range of gear ratios.\u003c\/p\u003e\n\u003cp\u003eThese HTD-3M pulleys feature a 3 mm pitch HTD tooth profile machined from aluminum alloy, with a stepped hub design and a belt-contact width of 11 mm. Tooth counts span from 45T to 150T, and bore options range from 5 mm to 25 mm (approximately 0.20 in to 0.98 in), covering the most common shaft diameters used in hobby and light-industrial motion systems. Each pulley includes a set-screw-ready hub for secure shaft retention.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router X\/Y axis drives, 3D printer extruder and motion systems, robotic arm joint actuators, and custom conveyor or indexing mechanisms — anywhere a synchronous belt drive with a 3 mm pitch HTD belt is required.\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 synchronous timing belts (3 mm pitch, 11 mm width). Verify bore size matches your shaft diameter before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These HTD-3M Timing Belt Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Range\u003c\/strong\u003e\n\u003cp\u003eAvailable from 45T to 150T, enabling flexible gear ratio selection for speed reduction or torque multiplication in your drive system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eMultiple Bore Sizes\u003c\/strong\u003e\n\u003cp\u003eBore options from 5 mm to 25 mm accommodate the most common shaft diameters used in CNC machines, 3D printers, and robotics platforms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eStepped Hub Design\u003c\/strong\u003e\n\u003cp\u003eThe integrated step hub provides axial positioning reference and added shaft contact area for more stable, vibration-resistant mounting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eHTD Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eThe rounded HTD tooth form distributes belt load across a larger contact area, reducing tooth stress and extending belt life compared to trapezoidal profiles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eSet-Screw Hub Retention\u003c\/strong\u003e\n\u003cp\u003eEach pulley hub is pre-drilled and tapped for a set screw, allowing tool-free shaft locking and quick repositioning during prototyping or assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003e11 mm Belt Width\u003c\/strong\u003e\n\u003cp\u003eMatched to standard 11 mm wide HTD-3M belts, ensuring full tooth engagement across the belt width for consistent torque transmission without edge loading.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — HTD-3M Timing Belt Pulley\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eHTD-3M (3 mm pitch, rounded tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (Types)\u003c\/th\u003e\n\u003ctd\u003e45T, 46T, 48T, 50T, 55T, 60T, 65T, 70T, 72T, 75T, 80T, 90T, 100T, 120T, 140T, 150T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e11 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped hub with set-screw\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\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\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\u003eSelect the tooth count based on your desired gear ratio. Divide the driven pulley tooth count by the drive pulley tooth count to get the reduction ratio. For example, pairing a 45T drive pulley with a 90T driven pulley gives a 2:1 speed reduction. Larger tooth counts also increase the pulley's pitch diameter, which affects belt length requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I order for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOrder the bore size that matches your shaft diameter exactly. Common shaft sizes for CNC and 3D printer applications include 5 mm, 6 mm, 6.35 mm (1\/4 in), 8 mm, 10 mm, and 12 mm. If your shaft is metric, select the matching metric bore. For imperial shafts, 6.35 mm corresponds to 1\/4 inch and 12.7 mm corresponds to 1\/2 inch.\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 to mesh with standard HTD-3M synchronous timing belts with a 3 mm pitch and 11 mm width. Ensure your belt width matches the 11 mm pulley groove width for full tooth engagement. Do not use with MXL, GT2, or other non-HTD belt profiles, as tooth geometry differs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the set-screw connection — will it slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe set screw provides adequate retention for typical hobby and light-duty CNC loads when properly torqued against a flat or keyway on the shaft. For high-torque applications, we recommend using a shaft with a machined flat to prevent rotation. Adding a second set screw at 90° (if the hub allows) further improves retention under reversing or shock loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\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\n\u003cp\u003eThese pulleys are machined from aluminum alloy, which offers a good strength-to-weight ratio and natural oxidation resistance suitable for indoor and dry-environment use. For humid or outdoor environments, consider applying a light coat of corrosion-inhibiting lubricant to the bore and hub surfaces. Aluminum is not recommended for highly corrosive chemical environments.\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. HTD-3M pulleys are widely used in 3D printer motion systems (particularly CoreXY and Cartesian designs) and CNC router axis drives. Verify that your existing belt is HTD-3M profile and 11 mm wide before ordering. The stepped hub design also makes these suitable for robotic joint actuators and custom indexing tables.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I determine the correct belt length when changing pulley sizes?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBelt length depends on center distance and the pitch diameters of both pulleys. Use the formula: Belt Length ≈ 2C + π(D1+D2)\/2 + (D2−D1)²\/(4C), where C is center distance and D1\/D2 are pitch diameters. Online HTD belt length calculators can simplify this. When switching to a larger tooth count pulley, you will typically need a longer belt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count (Types) and bore size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"3M-45T \/ 6mm \/ 1pcs","offer_id":52444082077970,"sku":"FXL1278-0","price":5.78,"currency_code":"USD","in_stock":true},{"title":"3M-45T \/ 6.35mm \/ 1pcs","offer_id":52444082110738,"sku":"FXL1278-1","price":5.78,"currency_code":"USD","in_stock":true},{"title":"3M-45T \/ 7mm \/ 1pcs","offer_id":52444082143506,"sku":"FXL1278-2","price":5.78,"currency_code":"USD","in_stock":true},{"title":"3M-45T \/ 8mm \/ 1pcs","offer_id":52444082176274,"sku":"FXL1278-3","price":5.78,"currency_code":"USD","in_stock":true},{"title":"3M-45T \/ 10mm \/ 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