{"product_id":"3m-htd-timing-belt-drive-pulley-3mm-pitch-aluminium","title":"3M 10mm Timing Belt Drive Pulley 3mm Pitch 15-50 Tooth 4-20mm Bore HTD Aluminium","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M HTD Timing Belt Drive Pulleys — Precision Aluminium for Reliable Motion Control\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched pulley causes your CNC router, 3D printer, or robotic axis to lose steps, the entire project stalls. Engineers, makers, and automation builders who need repeatable, backlash-free linear motion rely on correctly specified 3M HTD timing belt drive pulleys to keep every cycle on track.\u003c\/p\u003e\n\u003cp\u003eThese 3M HTD drive pulleys are CNC-machined from aluminium alloy and designed for 3mm-pitch HTD timing belts with a maximum belt width of 10mm (3\/8 inch). Available in three flange types — AF (flanged both sides), BF (single flange), and K (no flange) — with tooth counts from 15 to 50 and bore sizes from 4mm to 20mm (approx. 5\/32 inch to 25\/32 inch). Each pulley ships individually (1 pc per order).\u003c\/p\u003e\n\u003cp\u003eTypical applications include desktop 3D printer X\/Y axes, DIY CNC routing machines requiring a 3M HTD drive pulley replacement, lightweight robotic arm joints, and compact conveyor or indexing systems where a low-profile aluminium timing pulley keeps moving mass to a minimum.\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 Fits standard 3M HTD timing belts with a width up to 10mm (3\/8 inch). Verify your shaft diameter against the bore size options before ordering. Keyway availability depends on type — Type K pulleys include a keyway slot; Types AF and BF use a set-screw bore.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3M HTD Aluminium Drive Pulleys\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e3mm HTD Tooth Profile\u003c\/strong\u003e — Matches standard 3M HTD belts for positive, slip-free engagement and accurate positioning in motion-control systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eAluminium Alloy Construction\u003c\/strong\u003e — Lightweight yet rigid material reduces rotational inertia, making it well-suited for high-speed or high-cycle applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Bore Range (4–20mm)\u003c\/strong\u003e — Fourteen bore size options accommodate motor shafts from 4mm up to 20mm, covering the majority of NEMA 17, NEMA 23, and servo motor shaft diameters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\u003cstrong\u003eMultiple Tooth Counts (15–50T)\u003c\/strong\u003e — Six tooth count options per flange type let you dial in the exact drive ratio needed without resorting to custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eThree Flange Types (AF \/ BF \/ K)\u003c\/strong\u003e — Type AF keeps the belt centred with flanges on both sides; Type BF uses a single flange for space-constrained layouts; Type K adds a keyway for positive shaft locking under higher torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cstrong\u003eCNC-Machined Tooth Form\u003c\/strong\u003e — Consistent tooth geometry across the full range ensures smooth meshing, reduced vibration, and predictable belt life in continuous-duty use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 3M HTD Timing Belt Drive 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\u003eMax. Belt Width\u003c\/th\u003e\n\u003ctd\u003e10mm (3\/8 inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e15 \/ 20 \/ 25 \/ 30 \/ 40 \/ 50 Tooth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size Options\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 \/ 7 \/ 8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Type\u003c\/th\u003e\n\u003ctd\u003eAF (double flange) \/ BF (single flange) \/ K (keyway)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminium alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside 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\u003eSet Screw\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\u003eThe tooth count determines the pulley's pitch diameter and, combined with your motor's RPM, sets the linear speed of your belt. A smaller tooth count (e.g., 15T) gives a smaller diameter and higher belt speed per revolution, while a larger count (e.g., 50T) increases torque multiplication. Match the tooth count to your drive ratio requirements and verify that the resulting pitch diameter fits within your machine's frame clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between Type AF, Type BF, and Type K?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eType AF has flanges on both sides of the tooth face, which keeps the belt centred automatically — ideal for open-loop systems or where belt tracking is critical. Type BF has a flange on one side only, useful when space on one side is restricted. Type K has no flanges but includes a keyway slot in the bore, providing a positive mechanical lock to the shaft under higher torque loads where a set screw alone may not be sufficient.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm the correct bore size for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or drive shaft diameter with a vernier caliper. Select the bore size that matches exactly — these pulleys are machined to close tolerances and are not intended to be bored out further. If your shaft is between two listed sizes, contact us before ordering to confirm the best fit or whether a bushing solution is appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with GT2 or MXL belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These pulleys are specifically designed for the HTD 3M tooth profile, which has a rounded, curvilinear tooth form. GT2 belts use a different tooth geometry and will not mesh correctly with HTD pulleys. MXL belts use a trapezoidal profile and are also incompatible. Always match the pulley tooth profile to your belt specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the aluminium pulley corrode or wear quickly in my environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminium alloy has natural oxidation resistance suitable for most indoor automation, 3D printing, and light industrial environments. In high-humidity or chemically aggressive settings, consider applying a light coating of dry lubricant to the tooth face. For outdoor or washdown environments, contact us to discuss whether an anodised or alternative material option is available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys on a NEMA 17 or NEMA 23 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. NEMA 17 motors typically have a 5mm shaft, so the 5mm bore variant is the standard choice. NEMA 23 motors commonly use an 8mm or 1\/4-inch shaft — select the 8mm bore accordingly. Always verify your specific motor's datasheet for the exact shaft diameter before ordering, as some manufacturers deviate from the nominal size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pulleys are included per order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach order includes 1 pulley (1 pc) as listed in the variant options. If you need multiple pulleys for a multi-axis machine or a paired drive\/idler setup, simply adjust the quantity at checkout or place separate orders for different bore or tooth count combinations.\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, flange type, 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 Drive Pulley 【Pitch: 3mm】 \u0026 10mm (3\/8 inch) Max. \/ 15 Tooth【Type AF】 \/ 4mm \u0026 1 pcs","offer_id":52444179792146,"sku":"PENGDZ00712x1","price":3.2,"currency_code":"USD","in_stock":true},{"title":"3M Drive Pulley 【Pitch: 3mm】 \u0026 10mm (3\/8 inch) Max. \/ 15 Tooth【Type AF】 \/ 5mm \u0026 1 pcs","offer_id":52444179824914,"sku":"PENGDZ00713x1","price":3.2,"currency_code":"USD","in_stock":true},{"title":"3M Drive Pulley 【Pitch: 3mm】 \u0026 10mm (3\/8 inch) Max. \/ 15 Tooth【Type AF】 \/ 6mm 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