{"product_id":"htd-5m-80-120teeth-timing-belt-pulleys-pitch-5mm-af-type-with-keyway-width-21mm","title":"HTD-5M 80-120Teeth Timing Belt Pulleys Pitch 5mm AF-type With Keyway Width 21mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD-5M Timing Belt Pulleys — Precision AF-Type Synchronous Drive for CNC \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or misaligned pulley brings your CNC router, 3D printer, or automation stage to a halt, every minute of downtime costs you. Engineers, makers, and machine builders who demand repeatable, zero-backlash motion need a timing pulley they can trust across thousands of cycles. These HTD-5M timing belt pulleys are machined for exacting synchronous drive applications where positional accuracy is non-negotiable.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with an anodized finish, featuring an AF-type hub with a precision-cut keyway for secure shaft locking. The belt-contact width is 21mm, matching standard 5M timing belts. Tooth counts range from 80T to 120T, with bore options from 10mm (0.39 in) to 25mm (0.98 in) and keyway dimensions from 3×1.4mm up to 8×3.3mm to suit a wide range of shaft standards.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC gantry axis drives requiring consistent step accuracy, servo motor output stages in industrial automation panels, and high-torque belt drive systems in robotics joints and conveyor indexing mechanisms — all applications where an HTD-5M synchronous pulley with keyway must maintain precise timing under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with standard \u003cstrong\u003eHTD-5M timing belts\u003c\/strong\u003e (5mm pitch, 21mm width). Verify bore diameter and keyway dimensions against your shaft spec before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These HTD-5M 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\u003eAF-Type Hub with Keyway\u003c\/strong\u003e — Positive shaft engagement via machined keyway (3×1.4mm to 8×3.3mm depending on bore), eliminating rotational slip under torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eFour Tooth Count Options\u003c\/strong\u003e — Available in 80T, 90T, 100T, and 120T to dial in your drive ratio without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e\u003cstrong\u003eWide Bore Range\u003c\/strong\u003e — Bore sizes from 10mm to 25mm accommodate common motor and gearbox shaft diameters across servo, stepper, and DC motor platforms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003e21mm Belt Width\u003c\/strong\u003e — Matches standard 5M belt widths for direct drop-in replacement or new build integration without belt trimming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e — Lightweight yet rigid material keeps rotational inertia low for responsive acceleration in servo-driven axes and pick-and-place systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eHTD Tooth Profile\u003c\/strong\u003e — Rounded HTD tooth geometry distributes belt load across a larger contact area, reducing tooth shear stress and extending belt life in continuous-duty drives.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — HTD-5M Timing Belt Pulleys\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e5mm (HTD-5M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e80T \/ 90T \/ 100T \/ 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e21mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Type\u003c\/th\u003e\n\u003ctd\u003eAF-type (with keyway)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Options\u003c\/th\u003e\n\u003ctd\u003e10mm \/ 12mm \/ 14mm \/ 15mm \/ 19mm \/ 20mm \/ 25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Dimensions\u003c\/th\u003e\n\u003ctd\u003e3×1.4mm \/ 4×1.8mm \/ 5×2.3mm \/ 6×2.8mm \/ 8×3.3mm (bore-dependent)\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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eAnodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eHTD (rounded)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (80T)\u003c\/th\u003e\n\u003ctd\u003eapprox. 127.3mm (5.01 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (90T)\u003c\/th\u003e\n\u003ctd\u003eapprox. 143.2mm (5.64 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (100T)\u003c\/th\u003e\n\u003ctd\u003eapprox. 159.2mm (6.27 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (120T)\u003c\/th\u003e\n\u003ctd\u003eapprox. 190.9mm (7.52 in)\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 drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines the pitch diameter and, combined with your motor pulley tooth count, sets your drive ratio. For a 1:1 ratio use matching tooth counts on both pulleys. For speed reduction, pair a smaller driver pulley with a larger driven pulley — for example, a 20T motor pulley with an 80T load pulley gives a 4:1 reduction. Calculate center distance and belt length after selecting your ratio.\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 shaft diameter with calipers and select the matching bore. Available bores are 10, 12, 14, 15, 19, 20, and 25mm. The bore must match the shaft exactly — an oversized bore will cause runout even with a keyway. If your shaft is imperial (e.g., 0.5 in \/ 12.7mm), choose the nearest metric bore and confirm the keyway fits your shaft key.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat keyway dimensions correspond to each bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eKeyway dimensions follow standard metric shaft key sizing: 10mm bore → 3×1.4mm; 12mm bore → 4×1.8mm; 15mm bore → 5×2.3mm; 19–20mm bore → 6×2.8mm; 25mm bore → 8×3.3mm. The 14mm bore uses a 5×2.3mm keyway. These match DIN 6885 \/ ISO 773 standard key dimensions for the respective shaft diameters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with any 5M timing belt, or only specific brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are compatible with any standard HTD-5M timing belt with a 21mm width and 5mm pitch, regardless of brand. The HTD tooth profile is an industry-standard geometry, so belts from Gates, Bando, or equivalent manufacturers will mesh correctly. Confirm your belt width is 21mm — narrower or wider belts will not track properly on this pulley.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum construction for high-torque applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for most CNC, robotics, and automation drives operating at moderate torque levels. For very high-torque or shock-load applications (e.g., heavy industrial conveyors), consider whether a steel pulley is more appropriate. The AF-type keyway hub significantly increases torque capacity compared to set-screw-only designs by distributing load across the key rather than a single contact point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the anodized finish resist corrosion in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAnodizing creates an aluminum oxide layer that resists oxidation and mild corrosion in typical indoor and light-industrial environments. For prolonged exposure to moisture, salt spray, or aggressive chemicals, additional protective measures (such as a sealant or enclosure) are recommended. The anodized finish also reduces surface wear from belt contact over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley as a direct replacement for an existing worn pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided the replacement matches on all critical dimensions: tooth count, belt pitch (5M), belt width (21mm), bore diameter, and keyway size. Measure your existing pulley's pitch diameter or count the teeth, then select the matching variant. If the original pulley used a set screw without a keyway, verify your shaft has a keyway cut before installing this AF-type hub.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Number of Teeth, 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":"5M-80T \/ 10mm \/ 3x1.4mm \u0026 1Pcs","offer_id":52445484974354,"sku":"FXL5M80TC21D10K3AFx1","price":43.72,"currency_code":"USD","in_stock":true},{"title":"5M-80T \/ 10mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52445485007122,"sku":"FXL5M80TC21D10K4AFx1","price":43.72,"currency_code":"USD","in_stock":true},{"title":"5M-80T \/ 12mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52445485039890,"sku":"FXL5M80TC21D12K4AFx1","price":43.64,"currency_code":"USD","in_stock":true},{"title":"5M-80T \/ 15mm \/ 5x2.3mm \u0026 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