{"product_id":"3m-timing-belt-drive-pulley-bf-type-pitch-3mm-for-cnc-step-motor-50-120-teeth","title":"3M Timing Belt Drive Pulley BF-Type Pitch 3mm For CNC Step Motor 50~120 Teeth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M BF-Type Timing Belt Drive Pulley — Precision 3mm Pitch for CNC \u0026amp; Stepper Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched pulley causes positioning errors in your CNC router, 3D printer, or automated conveyor, every lost step costs time and accuracy. Engineers and makers who demand repeatable, zero-backlash motion need a drive pulley that holds its tooth profile under load — and that is exactly what this BF-Type 3M timing belt pulley is designed to deliver.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined to a 3mm pitch (3M) BF-Type tooth profile and is available in tooth counts from 50T to 120T, with bore diameters ranging from 6mm (~0.24 in) to 25mm (~0.98 in). Plain round bores and keyway bores (3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm, 8×3.3mm) are offered to suit both set-screw and keyed shaft connections. Belt slot width is 16mm across all variants.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC milling and routing machines requiring precise X\/Y axis drive, stepper-motor-driven 3D printer gantries where consistent belt tension is critical, and light-duty industrial conveyor or pick-and-place automation systems that rely on synchronous belt drives for accurate indexing.\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 3M (3mm pitch) synchronous timing belts, 16mm belt 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 3M BF-Type Timing Belt Drive Pulleys\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eBF-Type Tooth Profile\u003c\/strong\u003e — Engineered BF flange tooth geometry ensures positive belt engagement and prevents lateral belt walk during high-speed operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (50T–120T)\u003c\/strong\u003e — Nine tooth count options from 50 to 120 teeth let you dial in the exact gear ratio needed for your drive system without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e\u003cstrong\u003eMultiple Bore \u0026amp; Keyway Options\u003c\/strong\u003e — Plain bores from 6mm to 25mm plus keyway variants (3×1.4mm through 8×3.3mm) accommodate a broad range of motor and shaft standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eConsistent 16mm Belt Slot Width\u003c\/strong\u003e — All variants share a uniform 16mm slot width, making it straightforward to mix tooth counts within the same belt-width system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eSynchronous Drive Accuracy\u003c\/strong\u003e — The 3mm pitch tooth spacing maintains synchronous motion between driver and driven shafts, eliminating the slip inherent in friction-based drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e — Suited for CNC machines, stepper and servo motor drives, 3D printer gantries, and light automation conveyor systems using standard 3M timing belts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 3M BF-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\u003eBF-Type (flanged)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e50T \/ 60T \/ 65T \/ 70T \/ 75T \/ 80T \/ 90T \/ 100T \/ 120T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width (Slot)\u003c\/th\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 19mm, 20mm, 22mm, 25mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm, 8×3.3mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish \/ Colour\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\u003eCompatible Belt Standard\u003c\/th\u003e\n\u003ctd\u003e3M synchronous timing belt, 16mm width\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's tooth count, sets the drive ratio. A higher tooth count gives a larger pitch diameter and a lower mechanical advantage (faster belt speed, less torque multiplication). For most CNC and 3D printer applications, 50T–80T pulleys are common on the drive side. Match the tooth count to your belt length and center distance calculations to avoid excessive tension or slack.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat 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 or drive shaft diameter precisely with calipers. NEMA 17 stepper motors typically use a 5mm shaft, NEMA 23 motors commonly use 6.35mm (1\/4 in) or 8mm shafts, and NEMA 34 motors often use 12mm or 14mm shafts. Select the bore that matches your shaft diameter. If your shaft has a flat or key, choose the corresponding keyway bore variant to prevent rotational slip under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway bore, or will a plain bore with a set screw work?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor light-duty or low-torque applications (small 3D printers, light CNC routers), a plain bore secured with a set screw is typically sufficient. For higher-torque applications — such as larger CNC machines, servo drives, or conveyor systems — a keyway bore provides a positive mechanical connection that resists rotational slip even under shock loads. If your shaft already has a machined keyway, always use the matching keyway bore variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with any 3M timing belt, or only specific brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis pulley is designed to the standard 3M (3mm pitch) tooth profile, which is an industry-standard specification. It is compatible with any 3M synchronous timing belt of 16mm width from any manufacturer that conforms to the 3M pitch standard. Always verify that your belt's pitch and width match before assembling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the pulley will fit my existing belt drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eConfirm three parameters: (1) belt pitch — must be 3mm (3M); (2) belt width — must be 16mm; (3) bore diameter — must match your shaft. If you are replacing an existing pulley, also check the tooth count to maintain the same drive ratio. If you are designing a new system, calculate the required center distance using the tooth counts of both pulleys and the belt length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the plain bore and keyway bore variants at the same bore diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003ePlain bore variants have a smooth cylindrical hole and rely on one or two set screws to clamp onto the shaft. Keyway bore variants have a machined slot (e.g., 5×2.3mm) that accepts a standard key, creating a positive interlocking connection between the shaft and pulley. Keyway variants are recommended when torque is high, direction reverses frequently, or precise angular positioning must be maintained over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these pulleys be used with servo motors as well as stepper motors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The BF-Type 3M pulley is compatible with any motor type — stepper, servo, or DC — as long as the shaft diameter matches the selected bore and the belt pitch is 3M. Servo motor applications may benefit from keyway bore variants due to the higher torque and dynamic load reversals typical of closed-loop servo systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Numbers 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":"BF-Type \/ 3M 50T \/ 6mm \u0026 16mm","offer_id":52445144154386,"sku":"GLFBBYWGLBZSJ068074x1","price":21.08,"currency_code":"USD","in_stock":true},{"title":"BF-Type \/ 3M 50T \/ 8mm \u0026 16mm","offer_id":52445144187154,"sku":"GLFBBYWGLBZSJ068075x1","price":21.08,"currency_code":"USD","in_stock":true},{"title":"BF-Type \/ 3M 50T \/ 10mm \u0026 16mm","offer_id":52445144219922,"sku":"GLFBBYWGLBZSJ068076x1","price":21.08,"currency_code":"USD","in_stock":true},{"title":"BF-Type \/ 3M 50T \/ 12mm \u0026 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