{"product_id":"3m-timing-belt-pulley-12t-35t-bf-k-type-synchronous-wheel","title":"3M Timing Belt Pulley 12T-35T BF\/K Type Synchronous Wheel Bore 4-20mm Width 16mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M Timing Belt Pulley — Precision Synchronous Drive for CNC, Robotics \u0026amp; 3D Printing\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control build demands zero-slip synchronization, a mismatched or poorly machined pulley becomes the weakest link in the entire drivetrain. Engineers, hobbyist makers, and automation integrators who need repeatable, backlash-free power transmission rely on 3M timing belt pulleys that are dimensionally consistent and ready to mount without secondary machining.\u003c\/p\u003e\n\u003cp\u003eThese 3M pitch synchronous pulleys are machined from aluminum alloy and are available in BF-type (with flange) and K-type (without flange) configurations. Tooth counts span 12T to 35T, bore diameters range from 4 mm (0.16 in) to 20 mm (0.79 in), and the belt-contact width is a standardized 16 mm (0.63 in). A set screw secures the pulley to the shaft on standard bore variants; keyway bore options (e.g., 8 mm 3×1.4 mm, 10 mm 4×1.8 mm, 12 mm 5×2.3 mm) are available for higher-torque applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include 3M belt-driven CNC router axes, desktop 3D printer extruder and motion systems, lightweight robotic joint drives, and compact conveyor or indexing mechanisms where a 3M synchronous belt pulley with a 16 mm width is the specified component.\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 a 16 mm 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 Timing Belt Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBF-type \u0026amp; K-type options\u003c\/strong\u003e — BF-type includes flanges on both sides to keep the belt tracked; K-type is flangeless for applications where the belt is guided by the frame or tensioner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide tooth-count range (12T–35T)\u003c\/strong\u003e — Select the gear ratio that matches your motor RPM and required output speed without sourcing from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore diameter 4–20 mm with keyway variants\u003c\/strong\u003e — Standard round bores suit most stepper and servo shafts; keyway bores (3×1.4 mm, 4×1.8 mm, 5×2.3 mm) handle higher torque without set-screw slip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum alloy construction\u003c\/strong\u003e — Lightweight yet rigid, resisting deformation under belt tension while keeping rotating mass low for responsive acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 mm standardized belt width\u003c\/strong\u003e — Matches widely available 3M open-end and closed-loop belts, simplifying sourcing for replacement or system expansion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined tooth profile\u003c\/strong\u003e — Consistent 3M tooth geometry ensures smooth meshing with the belt, reducing vibration and noise in precision motion stages.\u003c\/li\u003e\n\u003c\/ul\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)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eBF-type (flanged) \/ K-type (flangeless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e12T, 14T, 15T, 16T, 18T, 20T, 24T, 25T, 26T, 28T, 30T, 35T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e16 mm (0.63 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm – 20 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e3×1.4 mm, 4×1.8 mm, 5×2.3 mm (see variant options)\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 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFastening\u003c\/th\u003e\n\u003ctd\u003eSet screw (standard bore); keyway (keyway bore variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\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\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 between BF-type and K-type pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBF-type pulleys have flanges on both sides of the tooth section, which physically retain the belt and prevent it from walking off the pulley — ideal when the belt is not otherwise guided. K-type pulleys are flangeless and are used when the machine frame, idler, or tensioner already keeps the belt aligned, or when axial space is limited.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich tooth count should I select for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTooth count determines the pulley pitch diameter and, combined with your motor pulley, sets the drive ratio. A smaller tooth count (e.g., 12T) gives a smaller pitch diameter and higher belt speed per revolution; a larger count (e.g., 35T) gives a larger pitch diameter and more torque multiplication. Match the tooth count to your required linear speed or gear ratio calculation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or drive shaft diameter precisely with calipers. Select the bore that matches — for example, a NEMA 17 stepper typically has a 5 mm shaft, while larger servo motors may use 6 mm, 8 mm, or larger. For high-torque applications, choose a keyway bore variant (e.g., 8 mm 3×1.4 mm) to prevent rotational slip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with standard 3M timing belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pulleys are machined to the standard 3M tooth profile (3 mm pitch), and are compatible with any 3M open-end or closed-loop timing belt with a 16 mm width. Confirm the belt width matches the 16 mm pulley face before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are aluminum alloy pulleys compared to steel?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys offer an excellent strength-to-weight ratio for most CNC, 3D printing, and light robotics applications. They handle the belt tension and torque loads typical of 3M belt systems without deformation. For very high-torque or heavy industrial duty cycles, consult the torque rating of your belt system and consider whether a steel pulley is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill aluminum pulleys corrode or oxidize over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For humid or mildly corrosive environments, anodized variants offer additional surface protection. These pulleys are not recommended for immersion or highly corrosive chemical exposure without additional protective coating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys in a 3D printer?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. 3M pitch pulleys with a 16 mm belt width are used in larger-format 3D printers and CNC machines. Verify that your printer's belt specification calls for 3M pitch — many desktop printers use 2GT (2 mm pitch) belts, which are not compatible. Check your machine's documentation before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a standard bore and a keyway bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA standard round bore uses a set screw to clamp the pulley onto the shaft. This is sufficient for most low-to-medium torque applications. A keyway bore includes a machined slot that accepts a key inserted between the shaft and pulley, providing a positive mechanical lock that prevents rotational slip under higher torque loads. Keyway dimensions (e.g., 3×1.4 mm, 4×1.8 mm, 5×2.3 mm) must match the key on your shaft.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your model type, tooth count, 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":"K-type \/ 12T \/ 4mm \u0026 16mm","offer_id":52445287514386,"sku":"GLFBFHHGLBZSJ067912x1","price":12.09,"currency_code":"USD","in_stock":true},{"title":"K-type \/ 12T \/ 5mm \u0026 16mm","offer_id":52445287547154,"sku":"GLFBFHHGLBZSJ067913x1","price":12.09,"currency_code":"USD","in_stock":true},{"title":"K-type \/ 12T \/ 6mm \u0026 16mm","offer_id":52445287579922,"sku":"GLFBFHHGLBZSJ067914x1","price":12.09,"currency_code":"USD","in_stock":true},{"title":"K-type \/ 12T \/ 6.35mm \u0026 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