{"product_id":"3m-timing-belt-pulley-af-type-50t-120t-belt-15mm-bore-5-40mm","title":"3M Timing Belt Pulley AF-Type 50T-120T Applicable Belt Width 15mm Bore 5mm~40mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M Timing Belt Pulley AF-Type — Precision Motion Control for Makers \u0026amp; Engineers\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a mismatched or worn pulley. This 3M timing belt pulley in AF-Type (flange-on-both-sides) configuration is engineered for makers, automation builders, and small-shop machinists who need repeatable, slip-free power transmission without the guesswork of custom machining.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a natural anodized finish, offering a balance of light weight and wear resistance. The 3M pitch (3 mm tooth spacing) profile mates with standard 3M open-ended or closed-loop timing belts. Tooth counts span 50T to 120T, and the applicable belt width is 15 mm (0.59 in). Bore diameters range from 5 mm to 40 mm (0.20 in – 1.57 in), with select variants featuring keyway bores (e.g., 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm) for positive shaft locking under torque.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: desktop 3D printer X\/Y axis drives requiring low-backlash 3M belt pulleys; DIY CNC router Z-axis lead-screw alternatives using 3M timing pulley sets; and lightweight robotic arm joint actuators where a small-bore 3M AF-type pulley keeps the assembly compact and balanced.\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 pitch (3 mm) timing belts with 15 mm width. AF-Type flanges on both sides keep the belt tracked. Verify bore diameter and keyway dimensions against your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 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\u003eWide Tooth-Count Range (50T–120T)\u003c\/strong\u003e\n\u003cp\u003eTen tooth-count options from 50T to 120T let you dial in the exact gear ratio your drive system needs — from fast, low-torque 3D printer axes to slower, high-torque CNC feeds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eAF-Type Double-Flange Design\u003c\/strong\u003e\n\u003cp\u003eFlanges on both sides of the pulley body keep the 15 mm belt centered under load, reducing edge wear and eliminating the need for external belt guides in most applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eBroad Bore Selection (5 mm – 40 mm)\u003c\/strong\u003e\n\u003cp\u003eRound bores from 5 mm to 25 mm and keyway bores up to 25 mm (8×3.3 mm key) accommodate a wide range of motor shafts and drive spindles without custom machining.\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 alloy body reduces rotational inertia for faster acceleration in servo and stepper motor systems, while maintaining dimensional stability across typical operating temperatures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eStandard 3M Pitch Compatibility\u003c\/strong\u003e\n\u003cp\u003eThe 3 mm tooth pitch is an internationally recognized standard, ensuring straightforward belt sourcing and drop-in replacement compatibility with existing 3M drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e \u003cstrong\u003eKeyway Bore Options for Positive Shaft Lock\u003c\/strong\u003e\n\u003cp\u003eSelect variants include machined keyways (4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm) that prevent rotational slip under sustained torque loads — critical for CNC and robotics applications.\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 — 3M Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e3M (3 mm tooth pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Belt Width\u003c\/th\u003e\n\u003ctd\u003e15 mm (0.59 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eAF-Type (double-flange)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e50T \/ 55T \/ 60T \/ 65T \/ 70T \/ 72T \/ 80T \/ 90T \/ 100T \/ 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 mm – 40 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 mm \/ 8×3.3 mm (select variants)\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\u003eNatural anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Width\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\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 number of teeth for my application?\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, sets the drive ratio. A higher tooth count (e.g., 120T) gives a larger pitch diameter and slower output speed with more torque; a lower count (e.g., 50T) gives a smaller diameter and faster output. Calculate your required ratio by dividing the driven pulley teeth by the driver pulley teeth. For 3D printers, 20T driver + 60T driven = 3:1 reduction is a common starting point for Z-axis drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I select 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 caliper. Select the bore that matches exactly — a loose bore causes runout and positioning errors. If your shaft has a flat (D-cut) or keyway, choose a keyway bore variant (e.g., 5×2.3 mm for a 14 mm shaft with a 5 mm key) to prevent rotational slip. Round bores are suitable for shafts secured with a set screw.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with GT2 or HTD belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. This pulley uses the 3M trapezoidal tooth profile with a 3 mm pitch. It is not interchangeable with GT2 (2 mm pitch, curvilinear) or HTD 3M (3 mm pitch, curvilinear) profiles. Always match the pulley tooth profile to your belt profile. If you are unsure, check your belt's part number for the pitch designation (3M = 3 mm trapezoidal).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is an aluminum pulley compared to steel for my CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium CNC routing, 3D printing, and robotics where rotational inertia and weight matter. For heavy-duty industrial applications with sustained high torque or abrasive environments, steel pulleys may be preferred. For most DIY CNC routers and desktop machines operating within the belt's rated tension, aluminum provides adequate strength and significantly reduces moving mass.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this pulley corrode if used in a humid workshop environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anodized aluminum finish provides a layer of corrosion resistance suitable for typical indoor workshop conditions, including moderate humidity. Anodizing is not a substitute for stainless steel in wet or salt-spray environments. For outdoor or high-moisture applications, apply a light coat of dry lubricant or corrosion inhibitor to the bore and hub area periodically.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a round bore and a keyway bore variant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA round bore relies on one or two set screws to grip the shaft. This is adequate for low-to-medium torque applications but can slip under shock loads. A keyway bore uses a machined slot that accepts a matching key inserted between the shaft and pulley, creating a positive mechanical lock. Keyway variants (4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm) are recommended for CNC spindles, servo motors, and any application where consistent positioning under varying torque is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley with a closed-loop timing belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. AF-Type pulleys work with both open-ended (cut-to-length) and closed-loop (endless) 3M timing belts of 15 mm width. When using a closed-loop belt, ensure the belt's inner circumference is compatible with your center-to-center distance and the pitch diameters of both pulleys in the drive system.\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 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":"AF-Type \/ 50T \/ 5mm \u0026 15mm","offer_id":52446025580818,"sku":"GLFBBYWGLBZSJ068354x1","price":15.48,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 50T \/ 6mm \u0026 15mm","offer_id":52446025613586,"sku":"GLFBBYWGLBZSJ068355x1","price":14.96,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 50T \/ 6.35mm \u0026 15mm","offer_id":52446025646354,"sku":"GLFBBYWGLBZSJ068356x1","price":15.48,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 50T \/ 8mm \u0026 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