{"product_id":"htd-3m-90t-120t-timing-belt-pulley-pitch-3mm-af-type-with-keyway-width-11mm","title":"HTD-3M 90T-120T Timing Belt Pulley Pitch 3mm AF-type With Keyway Width 11mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD-3M Timing Belt Pulleys — Precise AF-Type Drive for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or misaligned pulley derails your CNC router mid-cut or throws off your robot arm's repeatability, the root cause is almost always a pulley that wasn't machined to spec. Engineers, makers, and machine builders who demand consistent tooth engagement and zero-backseat motion need a pulley they can trust run after run.\u003c\/p\u003e\n\u003cp\u003eThese HTD-3M timing belt pulleys are machined from aluminum alloy and feature an AF-type (flanged) hub with a 11mm belt-width groove. Available in four tooth counts — 90T, 100T, 110T, and 120T — with bore options ranging from 8mm to 25mm (approximately 0.31\" to 0.98\"). Each pulley ships with a matching keyway slot sized to the bore (3×1.4mm up to 8×3.3mm) for positive shaft locking.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include 3mm-pitch HTD belt drive systems for desktop CNC machines and laser cutters, stepper-motor-driven axis drives in 3D printers and pick-and-place machines, and rotary indexing or conveyor systems in light industrial automation where synchronous, slip-free motion is critical.\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 HTD-3M (3mm pitch) synchronous timing belts with 11mm belt width. Verify your belt pitch, width, and shaft 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\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eAF-Type Flanged Hub\u003c\/strong\u003e\n\u003cp\u003eDual flanges on both sides of the belt groove keep the HTD-3M belt tracking straight, reducing edge wear and preventing belt walk during high-speed or reversing operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Selection\u003c\/strong\u003e\n\u003cp\u003eFour models — 90T, 100T, 110T, 120T — let you dial in the exact gear ratio your drive system requires without resorting to custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e \u003cstrong\u003eMultiple Bore Sizes with Matched Keyways\u003c\/strong\u003e\n\u003cp\u003eBore options from 8mm to 25mm, each paired with a standard DIN keyway (3×1.4mm to 8×3.3mm), ensure a positive, torque-transmitting fit on common motor and gearbox shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eLightweight aluminum keeps rotational inertia low — an important factor in servo and stepper applications where rapid acceleration and deceleration cycles are frequent.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003e11mm Groove Width for Standard HTD-3M Belts\u003c\/strong\u003e\n\u003cp\u003eThe 11mm groove width matches the most common HTD-3M belt widths used in desktop CNC, 3D printing, and light automation, so no belt trimming or shimming is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eSynchronous, Slip-Free Power Transmission\u003c\/strong\u003e\n\u003cp\u003eHTD tooth profile provides positive engagement with the belt's rounded tooth form, eliminating the slip inherent in V-belt or flat-belt systems and maintaining precise positional accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\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 Type\u003c\/th\u003e\n\u003ctd\u003eHTD-3M (3mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (Models)\u003c\/th\u003e\n\u003ctd\u003e90T \/ 100T \/ 110T \/ 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width (Groove)\u003c\/th\u003e\n\u003ctd\u003e11mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Type\u003c\/th\u003e\n\u003ctd\u003eAF-Type (flanged, both sides)\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\u003eBore Range\u003c\/th\u003e\n\u003ctd\u003e8mm – 25mm (0.31\" – 0.98\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Sizes\u003c\/th\u003e\n\u003ctd\u003e3×1.4mm \/ 4×1.8mm \/ 5×2.3mm \/ 6×2.8mm \/ 8×3.3mm (matched to bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (90T)\u003c\/th\u003e\n\u003ctd\u003eApprox. 85.9mm (3.38\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (100T)\u003c\/th\u003e\n\u003ctd\u003eApprox. 95.5mm (3.76\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (110T)\u003c\/th\u003e\n\u003ctd\u003eApprox. 105.0mm (4.13\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (120T)\u003c\/th\u003e\n\u003ctd\u003eApprox. 114.6mm (4.51\")\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\u003ctr\u003e\n\u003cth\u003eFinish\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 (90T, 100T, 110T, or 120T)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines the pitch diameter and, combined with your motor-side pulley tooth count, sets your drive ratio. A larger tooth count gives a larger pitch diameter and a lower reduction ratio when paired with a smaller drive pulley. Calculate your required ratio first, then select the tooth count that achieves it. Use the pitch diameter values in the spec table above to verify belt length compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or gearbox output shaft diameter with a caliper. Select the bore that matches exactly — available options are 8, 10, 12, 14, 15, 17, 19, 20, and 25mm. Each bore comes with a pre-cut keyway matched to standard DIN dimensions for that shaft size, so no additional machining is required for a keyed shaft.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat keyway size comes with each bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eKeyway dimensions are matched to the bore per standard practice: 8mm and 10mm bores use a 3×1.4mm keyway; 10mm (alt) and 12mm bores use 4×1.8mm; 14mm and 15mm bores use 5×2.3mm; 17mm bore also uses 5×2.3mm; 19mm and 20mm bores use 6×2.8mm; 25mm bore uses 8×3.3mm. The keyway is already cut — you supply the matching key stock.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley 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 belts with a 3mm pitch and 11mm width. They will not fit GT2 or MXL belts, which use different tooth profiles. Confirm your belt is labeled HTD-3M (or 3M) and is 11mm wide before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum alloy hub — can it handle high torque?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for the torque levels typical of NEMA 17\/23 stepper motors and small servo motors used in desktop CNC, 3D printing, and light automation. For very high-torque industrial applications (e.g., large servo drives above 5 Nm continuous), consider whether a steel pulley would be more appropriate. The keyway connection significantly increases torque capacity compared to a set-screw-only bore.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the pulley resist corrosion in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor workshop or light industrial environments. For prolonged exposure to moisture, salt spray, or aggressive chemicals, applying a clear anodize coating or protective spray after installation is recommended to extend service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley without a keyway (set-screw only)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe keyway is pre-cut into the bore, but you are not required to use a key. You can secure the pulley with a set screw alone if your shaft does not have a keyway slot. However, for applications with reversing loads or high torque, using the keyway with a matching key is strongly recommended to prevent rotational slippage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model (tooth count), Bore size, and Keyway \u0026amp; Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"3M90T \/ 10mm \/ 3x1.4mm \u0026 1Pcs","offer_id":52445648421138,"sku":"FXL3M90TC11D10K3AFx1","price":19.71,"currency_code":"USD","in_stock":true},{"title":"3M90T \/ 10mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52445648453906,"sku":"FXL3M90TC11D10K4AFx1","price":19.71,"currency_code":"USD","in_stock":true},{"title":"3M90T \/ 12mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52445648486674,"sku":"FXL3M90TC11D12K4AFx1","price":19.65,"currency_code":"USD","in_stock":true},{"title":"3M90T \/ 14mm \/ 5x2.3mm \u0026 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