{"product_id":"3m-timing-belt-drive-pulley-af-type-pitch-3mm-for-cnc-step-motor-45-120-teeth","title":"3M Timing Belt Drive Pulley AF-Type Pitch 3mm For CNC Step Motor 45~120 Teeth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M AF-Type Timing Belt Drive Pulley — Precision Motion Control for CNC \u0026amp; Stepper Motor Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or stepper motor drive system demands repeatable, slip-free power transmission, a mismatched or worn pulley becomes the weakest link in the chain. Engineers, makers, and automation integrators who need a dependable 3M pitch drive pulley with a wide tooth-count selection will find this AF-type series purpose-built for the task.\u003c\/p\u003e\n\u003cp\u003eThese pulleys feature a 3mm pitch (3M) AF-type tooth profile machined to accept standard 3M synchronous timing belts. The bore diameter ranges from 5mm to 40mm (~0.20\" to ~1.57\") depending on variant, and the slot width is 16mm across all configurations. Tooth counts span 45T through 120T, allowing fine-tuning of gear ratios for speed or torque. The body is typically machined from aluminum alloy, keeping rotating mass low while maintaining dimensional stability.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router X\/Y axis drives requiring precise positioning, open-loop stepper motor belt drives in laser engravers and plasma cutters, and lightweight robotics joint actuators where a compact 3M pulley with a keyed or plain bore is needed for direct shaft mounting.\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\u003e3M pitch (3mm) synchronous timing belts\u003c\/strong\u003e, 16mm belt width. Verify bore size and tooth count match your shaft diameter and drive ratio before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3M AF-Type Timing Belt Drive Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e3mm Pitch AF-Type Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eEngineered to the 3M synchronous belt standard, the AF-type tooth form provides positive engagement with matching 3M belts, minimizing backlash and tooth jump under dynamic loads typical of CNC and stepper motor applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eWide Bore Selection — 5mm to 40mm\u003c\/strong\u003e\n\u003cp\u003eAvailable bore diameters from 5mm up to 40mm (~0.20\" to ~1.57\") cover the most common stepper motor shaft sizes (5mm, 6.35mm, 8mm) as well as larger servo and spindle shafts, reducing the need for 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\u003eThe lightweight aluminum body keeps rotational inertia low — a critical factor in stepper motor systems where rapid direction changes demand fast acceleration and deceleration without overloading the motor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003e45T to 120T Tooth Range for Ratio Flexibility\u003c\/strong\u003e\n\u003cp\u003eTwelve tooth-count options from 45T to 120T let you dial in the exact drive ratio your system needs — whether you are optimizing for linear speed on a CNC gantry or torque multiplication on a heavy-duty conveyor axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e \u003cstrong\u003eKeyway \u0026amp; Plain Bore Options\u003c\/strong\u003e\n\u003cp\u003eSelect variants include keyway slots (e.g., 5×2.3mm, 6×2.8mm, 8×3.3mm) for positive torque transmission on keyed shafts, while plain bore variants suit set-screw or press-fit mounting on smooth shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003e16mm Uniform Belt Width Compatibility\u003c\/strong\u003e\n\u003cp\u003eAll variants in this series are designed for 16mm wide 3M timing belts, ensuring consistent belt tracking and even load distribution across the full tooth face — reducing edge wear and extending belt service life.\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 AF-Type Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e3mm (3M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eAF-Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e45T \/ 48T \/ 50T \/ 55T \/ 60T \/ 65T \/ 70T \/ 72T \/ 80T \/ 90T \/ 100T \/ 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e5mm – 40mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e5×2.3mm \/ 6×2.8mm \/ 8×3.3mm \/ 4×1.8mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Material\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC routers, stepper motor drives, laser engravers, robotics, automation\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 system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your drive ratio when paired with a second pulley. Divide the driven pulley teeth by the drive pulley teeth to get the ratio. For example, a 45T drive pulley paired with a 90T driven pulley gives a 2:1 reduction, doubling torque while halving speed. For CNC gantry axes where speed matters more than torque, choose a smaller tooth-count difference between the two pulleys.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select for a standard NEMA 17 or NEMA 23 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNEMA 17 stepper motors typically have a 5mm output shaft, so the 5mm bore variant is the direct fit. NEMA 23 motors commonly use an 8mm shaft, making the 8mm bore the standard choice. If your motor shaft has a flat (D-cut), a set-screw bore variant will work; if it has a keyway, select the matching keyway bore option (e.g., 5×2.3mm for a 5mm keyed shaft).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with any 3M timing belt, or only specific brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys conform to the standard 3M synchronous belt tooth profile, which means they are compatible with any 3M pitch timing belt of 16mm width from any manufacturer that follows the 3M standard. Always verify the belt pitch (3mm) and width (16mm) match before pairing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a plain bore and a keyway bore variant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA plain bore pulley relies on a set screw or press fit to secure it to the shaft. This is simpler to install but may slip under high torque. A keyway bore (e.g., 5×2.3mm, 6×2.8mm) uses a matching key inserted between the shaft and pulley to provide a positive mechanical lock, preventing rotational slip even under shock loads. Choose keyway variants for high-torque or reversing-load applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the pitch diameter and center distance for my belt drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe pitch diameter (PD) of a 3M pulley is calculated as: PD = (Number of Teeth × Pitch) ÷ π. For example, a 45T pulley: PD = (45 × 3) ÷ 3.1416 ≈ 42.97mm. Center distance depends on the belt length and both pulley pitch diameters. Use the standard belt drive center distance formula or an online belt drive calculator, inputting both pulley PDs and your chosen belt length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill aluminum pulleys corrode or wear out quickly in dusty CNC environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy has natural oxidation resistance that forms a protective layer, making it suitable for typical indoor CNC and automation environments. In dusty conditions, the primary wear factor is abrasive particles between the belt and pulley teeth. Regular cleaning of the belt and pulley groove, combined with correct belt tension, will significantly extend service life. For highly corrosive or wet environments, consider anodized variants or stainless steel alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys for a 3D printer belt drive upgrade?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Many 3D printers use 3M (or GT2\/GT3) belt systems on their X and Y axes. If your printer uses a 3M pitch belt with 16mm width, these AF-type pulleys are a direct mechanical fit. Verify the bore matches your motor shaft (commonly 5mm for NEMA 17) and that the tooth count matches your existing setup or desired ratio change. Note that GT2 and 3M are different profiles — confirm your belt is specifically 3M pitch before ordering.\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 Size \u0026amp; Slot Width 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 45T \/ 5mm \u0026 16mm","offer_id":52444847374610,"sku":"GLFBBYWGLBZSJ068322x1","price":7.6,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 45T \/ 6mm \u0026 16mm","offer_id":52444847407378,"sku":"GLFBBYWGLBZSJ068323x1","price":7.6,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 45T \/ 6.35mm \u0026 16mm","offer_id":52444847440146,"sku":"GLFBBYWGLBZSJ068324x1","price":7.6,"currency_code":"USD","in_stock":true},{"title":"AF-Type \/ 3M 45T \/ 8mm \u0026 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