{"product_id":"htd-3m-timing-belt-pulley-12-30-teeth-3mm-pitch-16mm","title":"Synchronous Wheel HTD-3M 12 - 30 Teeth Timing Belt Pulleys Pitch 3mm ,Width 16mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD-3M Timing Belt Pulley — Precise Synchronous Drive for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen slipping or misaligned pulleys cause positioning errors in your CNC router, 3D printer, or automation rig, the root cause is often an undersized or poorly matched synchronous wheel. Engineers and makers who demand repeatable, zero-slip motion need an HTD-3M timing belt pulley that is machined to spec and ready to mount without rework.\u003c\/p\u003e\n\u003cp\u003eThese HTD-3M synchronous wheels feature a 3 mm pitch HTD tooth profile and a 16 mm belt-contact width. Tooth counts span 12 to 30 teeth, covering pitch diameters from approximately 11.5 mm (0.45 in) for 12T up to approximately 28.6 mm (1.13 in) for 30T. Bore options range from 5 mm to 20 mm (0.20 in – 0.79 in), including a 6.35 mm (1\/4 in) and 12.7 mm (1\/2 in) imperial bore for mixed metric\/imperial builds. Each pulley ships with a set-screw collar for secure shaft retention.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: stepper-motor drive trains in desktop CNC mills and laser cutters requiring HTD-3M belt pulley replacement; extruder and axis drives in FDM 3D printers needing a 3mm pitch synchronous wheel upgrade; and compact servo or BLDC motor gearless reduction stages in robotics and pick-and-place automation where a timing pulley gear ratio change is needed without adding a gearbox.\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 timing belts, 16 mm belt width. Verify shaft diameter matches your selected bore 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\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eHTD-3M Tooth Profile\u003c\/strong\u003e — 3 mm pitch curvilinear tooth form delivers smooth, low-noise power transfer and reduces belt fatigue compared to trapezoidal profiles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e16 mm Belt Width\u003c\/strong\u003e — Matched to standard 16 mm wide HTD-3M belts; wider contact surface distributes load evenly for sustained torque transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Range (12–30T)\u003c\/strong\u003e — Fourteen tooth-count options let you dial in the exact gear ratio or pitch diameter your drive system requires without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eMulti-Bore Options (5–20 mm)\u003c\/strong\u003e — Bore sizes from 5 mm to 20 mm, including 6.35 mm and 12.7 mm imperial sizes, accommodate stepper shafts, servo shafts, and standard motor outputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eSet-Screw Shaft Retention\u003c\/strong\u003e — Each pulley includes a radial set-screw collar to lock the wheel firmly onto the shaft and prevent axial or rotational slip under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e — Standard HTD-3M flange and hub dimensions ensure direct compatibility with off-the-shelf HTD-3M belts and most open-frame CNC and 3D-printer carriages.\u003c\/li\u003e\n\u003c\/ul\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 Profile\u003c\/th\u003e\n\u003ctd\u003eHTD-3M (curvilinear)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e12 \/ 13 \/ 14 \/ 15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20 \/ 24 \/ 25 \/ 26 \/ 28 \/ 30 Teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12 \/ 12.7 \/ 14 \/ 15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003eApprox. 11.5 mm (12T) – 28.6 mm (30T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Retention\u003c\/th\u003e\n\u003ctd\u003eSet-screw collar (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange\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\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 the pitch diameter and, combined with your belt length and center distance, sets the gear ratio. For a 1:1 drive use identical pulleys on both shafts. To reduce speed (increase torque) use a larger tooth count on the driven shaft. Use an online belt-drive calculator: enter pitch (3 mm), desired center distance, and tooth counts to confirm belt length before ordering.\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\u003eCommon NEMA 17 stepper shafts are 5 mm; NEMA 23 shafts are typically 6.35 mm (1\/4 in) or 8 mm. Measure your shaft diameter with calipers before selecting a bore. The set-screw collar accommodates minor shaft tolerance variation, but the bore must match the shaft diameter — do not attempt to force a smaller bore onto a larger shaft.\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 machined to the HTD-3M tooth profile standard (3 mm pitch, curvilinear tooth form) and are compatible with any HTD-3M timing belt of 16 mm width. They are not interchangeable with MXL, GT2, or T5 profile belts — verify your belt profile before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these pulleys under continuous load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eLoad capacity depends on tooth count, belt tension, and operating speed. The HTD-3M profile distributes stress across the curved tooth root, reducing peak stress versus trapezoidal profiles. For continuous-duty or high-cycle applications, keep belt tension within the belt manufacturer's recommended range and avoid shock loads that exceed the belt's rated tensile strength. Contact us if you need load data for a specific configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these pulleys resist corrosion in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCorrosion resistance depends on the pulley material. Please refer to the variant listing or contact us to confirm the material and surface finish for your selected variant. For humid or mildly corrosive environments, consider applying a light machine oil or dry-film lubricant to the bore and set-screw area after installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys for a speed-reduction drive in a robotics project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Pair a small-tooth-count pulley (e.g., 12T) on the motor shaft with a large-tooth-count pulley (e.g., 30T) on the output shaft to achieve a 2.5:1 speed reduction with corresponding torque multiplication. The 16 mm belt width provides adequate torque capacity for most small-robot and pick-and-place applications. Confirm center distance and belt length using a belt-drive calculator before finalising your design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between HTD-3M and GT2 3mm pitch pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBoth use a 3 mm pitch but have different tooth profiles. HTD-3M uses a circular-arc (curvilinear) tooth form optimised for higher torque and power transmission. GT2 (Gates Tooth) uses a modified curvilinear profile with tighter tolerances, often preferred in precision 3D-printer motion systems. These pulleys are HTD-3M profile only and are not interchangeable with GT2 belts.\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 \/ 5mm \/ 1 Pcs","offer_id":52444890005778,"sku":"YMXS3M12TC16D5KFx1","price":8.69,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 6mm \/ 1 Pcs","offer_id":52444890038546,"sku":"YMXS3M12TC16D6KFx1","price":8.69,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 6,35mm \/ 1 Pcs","offer_id":52444890071314,"sku":"YMXS3M12TC16D6.35KFx1","price":8.69,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 7mm \/ 1 Pcs","offer_id":52444890104082,"sku":"YMXS3M12TC16D7KFx1","price":8.69,"currency_code":"USD","in_stock":true},{"title":"13 Teeth \/ 5mm \/ 1 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