{"product_id":"htd-3m-90-120teeth-timing-belt-pulley-pitch-3mm-af-type-keyway-width-16mm","title":"HTD-3M 90-120Teeth Timing Belt Pulley Pitch 3mm AF-type With Keyway, Width 16mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD-3M Timing Belt Pulley — Precision AF-Type Drive for CNC \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched pulley stalls your CNC router, 3D printer, or robotic axis mid-job, the cost is more than downtime — it's lost accuracy and rework. Engineers, makers, and machine builders who demand repeatable, zero-backlash motion need an HTD-3M timing belt pulley they can trust to stay locked in sync. This AF-type pulley is designed for exactly that: reliable synchronous drive in compact, high-cycle applications.\u003c\/p\u003e\n\u003cp\u003eEach HTD-3M timing belt pulley features an aluminum alloy body with a 3mm HTD tooth pitch and a 16mm belt width (W16). Available in four tooth counts — 90T, 100T, 110T, and 120T — with bore options ranging from 8mm to 25mm (approximately 0.31\" to 0.98\"). The AF-type split-hub design accepts a standard keyway (3×1.4mm up to 8×3.3mm depending on bore) for positive torque transmission without set-screw slippage.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC gantry and axis drives requiring precise lead-screw synchronization, desktop 3D printer extruder and motion systems using HTD-3M belt loops, and light-duty robotic joint actuators where a compact timing belt pulley for robotics replaces heavier gear trains. The 90–120 tooth range also suits low-speed, high-torque reduction stages in automation conveyor systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatible with:\u003c\/strong\u003e HTD-3M open-end and closed-loop timing belts, 16mm belt width. Verify bore and keyway dimensions against your shaft spec 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\u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n\u003cstrong\u003e90–120 Tooth Range\u003c\/strong\u003e\n\u003cp\u003eFour models (3M90T, 3M100T, 3M110T, 3M120T) cover a wide reduction ratio spread, letting you dial in the exact speed-torque trade-off for your drive system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e3mm HTD Pitch, 16mm Width\u003c\/strong\u003e\n\u003cp\u003eMatches standard HTD-3M belt profiles. The 16mm face width distributes belt load evenly, reducing edge wear and extending belt life in continuous-duty cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eAF-Type Split Hub with Keyway\u003c\/strong\u003e\n\u003cp\u003eThe AF-type bore accepts a machined keyway (3×1.4mm to 8×3.3mm) for positive shaft locking — no set-screw cam-out under reversing loads or vibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eBore Options 8–25mm\u003c\/strong\u003e\n\u003cp\u003eNine bore sizes (8, 10, 12, 14, 15, 17, 19, 20, 25mm) accommodate common metric shaft diameters used in stepper motors, servo motors, and linear actuators.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚖️\u003c\/div\u003e\n\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eLightweight aluminum alloy body keeps rotating inertia low — critical for high-acceleration CNC and robotics axes — while maintaining dimensional stability under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eZero-Backlash Synchronous Drive\u003c\/strong\u003e\n\u003cp\u003eHTD tooth profile provides positive engagement with the belt, eliminating the positional error that plagues friction-drive and V-belt systems in precision motion applications.\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 (3mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e90T \/ 100T \/ 110T \/ 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width (Face Width)\u003c\/th\u003e\n\u003ctd\u003e16mm (0.63\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Type\u003c\/th\u003e\n\u003ctd\u003eAF-type (split hub with keyway)\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 Dimensions\u003c\/th\u003e\n\u003ctd\u003eSee variant options (3×1.4mm to 8×3.3mm)\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\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\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\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ anodized aluminum\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 higher tooth count gives a larger pitch diameter, which increases belt contact arc and reduces tooth load — useful for higher-torque or lower-speed output stages. Calculate your required ratio first, then select the tooth count that achieves it with a standard belt length.\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 or servo motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bore to your motor shaft diameter. NEMA 23 stepper shafts are typically 8mm, and servo motors often use 10–25mm shafts. Select the bore that matches your shaft, then confirm the keyway dimensions align with your shaft's existing keyway cut.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat keyway size comes with each bore option?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eKeyway dimensions are paired to bore size per standard metric keyway tables: 8mm bore → 3×1.4mm; 10mm bore → 3×1.4mm or 4×1.8mm; 12mm bore → 4×1.8mm; 14mm bore → 5×2.3mm; 15mm bore → 5×2.3mm; 17mm bore → 5×2.3mm; 19mm bore → 6×2.8mm; 20mm bore → 6×2.8mm; 25mm bore → 8×3.3mm. Select the Keyway \u0026amp; Amount variant option that matches your shaft's keyway.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with HTD-3M closed-loop timing belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This pulley is designed for the HTD-3M tooth profile (3mm pitch, rounded tooth form) and is compatible with both open-end HTD-3M belts and closed-loop HTD-3M timing belt loops, provided the belt width is 16mm. Do not use with GT2 or MXL profile belts — the tooth geometry is different and will cause premature wear or skipping.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum alloy body — can it handle high-torque applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium duty synchronous drives typical of CNC machines, 3D printers, and small robotic joints. For very high-torque or heavy industrial applications, consider steel pulleys. The AF-type keyway hub provides significantly better torque transmission than set-screw-only designs, reducing the risk of slippage under reversing loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the pulley include a belt, key stock, or fasteners?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach order includes 1 piece of the timing belt pulley only. Belt, key stock, set screws, and flanges are not included. Browse our related components or contact us for bundle options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I estimate the outer diameter before ordering?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe pitch diameter of an HTD-3M pulley can be estimated as: PD = Teeth × Pitch \/ π. For a 90T pulley: PD ≈ 90 × 3 \/ π ≈ 85.9mm; outer diameter is slightly larger. Contact us and we can provide a dimensional drawing for your selected model and bore.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model, Bore, 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":52445666083090,"sku":"FXL3M90TC16D10K3AFx1","price":22.02,"currency_code":"USD","in_stock":true},{"title":"3M90T \/ 10mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52445666115858,"sku":"FXL3M90TC16D10K4AFx1","price":22.02,"currency_code":"USD","in_stock":true},{"title":"3M90T \/ 12mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52445666148626,"sku":"FXL3M90TC16D12K4AFx1","price":21.96,"currency_code":"USD","in_stock":true},{"title":"3M90T \/ 14mm \/ 5x2.3mm \u0026 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