{"product_id":"3m-timing-belt-drive-pulley-af-type-pitch-3mm-cnc-stepper-motor","title":"3M Timing Belt Drive Pulley AF-Type Pitch 3mm For CNC Step Motor 12~40 Teeth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M Timing Belt Drive Pulley AF-Type — Precision Synchronous Drive for CNC \u0026amp; Stepper Motor Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router skips steps or your 3D printer loses positional accuracy, the culprit is often a mismatched or worn drive pulley. Engineers, makers, and automation builders who demand repeatable motion need a pulley that holds tolerance under continuous load — and that is exactly what the AF-Type 3M timing belt drive pulley is designed to deliver.\u003c\/p\u003e\n\u003cp\u003eThis pulley series features an AF-Type flange profile machined to accept standard 3M pitch (3 mm \/ 0.118 in) synchronous belts. The hub is precision-bored with a set-screw slot for secure shaft clamping. Bore sizes range from 4 mm to 20 mm (approx. 0.157 in – 0.787 in), and tooth counts span 12 T through 40 T, covering a wide range of drive ratios. The slot width is 16 mm across all variants, matching standard 3M belt widths. Body material is aluminum alloy with a natural anodized or machined finish, keeping rotating mass low while maintaining dimensional stability.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router X\/Y axis drives requiring low-backlash 3M belt pulley replacement, stepper motor timing pulley upgrades for RepRap or CoreXY 3D printers, and light-duty conveyor or indexing table synchronous drive systems where a 3M pitch aluminum pulley with selectable bore is needed.\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 standard 3M pitch (3 mm tooth pitch) synchronous timing belts with 16 mm width. Verify your belt pitch, belt width, and shaft diameter before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 3M AF-Type Timing Belt Drive Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e3 mm Pitch Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eMachined AF-Type tooth geometry matches standard 3M synchronous belts for positive, slip-free engagement and consistent step accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eWide Bore Selection\u003c\/strong\u003e\n\u003cp\u003eAvailable bore diameters from 4 mm to 20 mm (0.157 in – 0.787 in) accommodate common stepper motor shaft sizes including 4, 5, 6, 6.35, 8, 10, 12, 12.7, 14, 15, 16, 17, 19, and 20 mm.\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 reduces rotational inertia, enabling faster acceleration and deceleration in motion control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003e12 to 40 Tooth Range\u003c\/strong\u003e\n\u003cp\u003eThirteen tooth-count options (12 T, 15 T, 16 T, 18 T, 20 T, 24 T, 25 T, 28 T, 30 T, 32 T, 35 T, 36 T, 40 T) let you dial in the exact drive ratio your system requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eSet-Screw Slot Clamping\u003c\/strong\u003e\n\u003cp\u003eThe AF-Type hub includes a machined keyway slot for set-screw or key-based shaft retention, preventing rotational slip under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003e16 mm Belt Width Compatibility\u003c\/strong\u003e\n\u003cp\u003eAll variants are sized for 16 mm wide 3M belts, a widely stocked standard width that simplifies belt sourcing for repairs and new builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — 3M AF-Type 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 Pitch\u003c\/th\u003e\n\u003ctd\u003e3 mm (3M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eAF-Type (flanged, set-screw hub)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003eSee variant options (12 T – 40 T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (4 mm – 20 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e16 mm\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 machined \/ anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (varies by tooth count)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eAF-Type with set-screw slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e1 piece per order\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 your drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the ratio. For a 1:1 ratio use matching tooth counts on both pulleys. For speed reduction, use fewer teeth on the motor pulley and more on the driven pulley. Common CNC and 3D printer setups use 20 T pulleys on the motor shaft paired with a matching 20 T idler, or a 16 T \/ 20 T combination for a slight reduction.\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 motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor shaft diameter with calipers before ordering. NEMA 17 stepper motors typically have a 5 mm shaft; NEMA 23 motors commonly use 6.35 mm (1\/4 in) or 8 mm shafts. Select the bore that matches your shaft exactly — a loose bore will cause runout and positional error even with the set screw tightened.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the slot width of 16 mm mean, and which belt do I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe slot width (16 mm) refers to the usable belt-running width between the flanges. You need a 3M pitch timing belt that is 16 mm wide (commonly listed as 3M-16 or T3-16). Verify both the pitch (3 mm tooth spacing) and the width (16 mm) when purchasing a replacement or mating belt.\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 is machined for the 3M (trapezoidal) tooth profile with a 3 mm pitch. GT2 belts use a 2 mm pitch curvilinear profile, and HTD 3M belts use a rounded tooth profile — neither is interchangeable with this AF-Type 3M trapezoidal pulley. Always match the belt tooth profile and pitch to the pulley specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the set-screw clamping, and can I use a key?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe AF-Type hub includes a machined flat or keyway slot designed for set-screw retention. For light-to-medium CNC and 3D printer loads this is sufficient. For higher-torque applications, select a variant with a keyed bore slot (indicated by the slot dimension in the variant name, e.g., 8mm(3×1.4mm)) and use a matching key for positive torque transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill aluminum pulleys corrode or wear out quickly?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy has good natural corrosion resistance in typical indoor environments. The anodized or machined surface finish adds a further protective layer. For outdoor or high-humidity environments, periodic inspection is recommended. Belt wear is typically the limiting factor in service life rather than pulley wear, provided the belt tension and alignment are correctly set.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley on a servo motor or DC motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided the shaft diameter matches the selected bore and the torque requirement is within the set-screw clamping capacity. This pulley is not limited to stepper motors — it is suitable for any motor or shaft application requiring a 3M pitch synchronous belt drive with a 16 mm belt width.\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 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":"AF-Type \/ 3M 12T \/ 4mm \u0026 16mm","offer_id":52445130785042,"sku":"GLFBBYWGLBZSJ068180x1","price":12.17,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 12T \/ 5mm \u0026 16mm","offer_id":52445130817810,"sku":"GLFBBYWGLBZSJ068181x1","price":12.17,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 15T \/ 4mm \u0026 16mm","offer_id":52445130850578,"sku":"GLFBBYWGLBZSJ068182x1","price":12.24,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 15T \/ 5mm \u0026 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