{"product_id":"3m-timing-belt-pulley-k-bf-type-10mm-width-20t-30t","title":"3M K\/BF-Type Timing Belt Pulley Applicable Belt Width 10mm 20T~30T Bore 4mm-17mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M Timing Belt Pulley — K\/BF-Type for Precise Motion Control in CNC \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eEngineers and makers building CNC routers, 3D printers, or robotic actuators know the frustration of belt slip and misalignment caused by poorly toleranced pulleys. These 3M K\/BF-type timing belt pulleys are designed for builders who need repeatable, slip-free power transmission in compact drive systems where every millimeter of accuracy counts.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a natural or anodized finish and features a 3M tooth profile (3 mm pitch). Available in two flange styles — BF-type (double-flange) and K-type (single-flange) — with tooth counts from 20T to 30T and bore diameters ranging from 4 mm (0.16 in) to 17 mm (0.67 in). All variants are matched to a 10 mm (0.39 in) belt width.\u003c\/p\u003e\n\u003cp\u003eTypical applications include DIY CNC gantry drives requiring 3M synchronous belt pulleys, desktop 3D printer X\/Y axis timing pulley replacements, and lightweight robotic arm joint drives where a low-profile aluminum timing pulley with set-screw bore is needed for precise 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 \u003cstrong\u003e3M pitch (3 mm) synchronous timing belts, 10 mm width\u003c\/strong\u003e — BF-type fits standard double-flange applications; K-type suits single-flange or open-track configurations.\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\u003eDual Model Options\u003c\/strong\u003e\n\u003cp\u003eChoose BF-type (double-flange) for guided belt tracking or K-type (single-flange) for open-track and tandem drive setups — both share the same 3M tooth geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Range\u003c\/strong\u003e\n\u003cp\u003eAvailable in 20T, 22T, 24T, 25T, 28T, and 30T to let you dial in the exact gear ratio your drive system requires without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eBroad Bore Selection\u003c\/strong\u003e\n\u003cp\u003eBore diameters from 4 mm to 17 mm (including 6.35 mm \/ 1\/4 in and 12.7 mm \/ 1\/2 in imperial sizes) cover most stepper motor and servo shaft standards out of the box.\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 yet rigid aluminum body keeps rotational inertia low — critical for high-acceleration CNC and robotics applications where motor response time matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eSet-Screw Bore Retention\u003c\/strong\u003e\n\u003cp\u003eEach pulley includes a set-screw bore for secure shaft fixation without adhesives, allowing quick swaps during prototyping or maintenance cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSold Individually, Ready to Install\u003c\/strong\u003e\n\u003cp\u003eEach unit is a single pulley — order the exact quantity you need for your drive system without paying for surplus stock.\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)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Belt Width\u003c\/th\u003e\n\u003ctd\u003e10 mm (0.39 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e20T \/ 22T \/ 24T \/ 25T \/ 28T \/ 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e4 mm – 17 mm (0.16 in – 0.67 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Bore Sizes\u003c\/th\u003e\n\u003ctd\u003e4, 5, 6, 6.35, 7, 8, 10, 12, 12.7, 14, 15, 16, 17 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Style\u003c\/th\u003e\n\u003ctd\u003eBF-type (double-flange) \/ K-type (single-flange)\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\u003eBore Retention\u003c\/th\u003e\n\u003ctd\u003eSet-screw\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 Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per unit)\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 between BF-type and K-type?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBF-type pulleys have flanges on both sides of the tooth face, which keeps the belt centered and prevents lateral drift — ideal for single-pulley drive stages. K-type pulleys have a flange on one side only, making them better suited for tandem or multi-pulley arrangements where the opposing pulley provides the second guide surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for a NEMA 17 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a D-cut shaft, ensure the set-screw is tightened against the flat for a secure fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tooth count gives me the right speed ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe speed ratio between two pulleys equals the ratio of their tooth counts. For example, pairing a 20T drive pulley with a 30T driven pulley gives a 1.5:1 reduction. Choose your tooth counts based on the desired linear speed or torque multiplication for your specific axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with GT2 or HTD belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These pulleys use a 3M tooth profile (3 mm pitch, trapezoidal). They are not interchangeable with GT2 (2 mm pitch) or HTD 3M (curvilinear profile) belts. Always match the pulley tooth profile to your belt profile for correct meshing and load transfer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum body under continuous load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium duty CNC, 3D printing, and robotics applications. For continuous high-torque industrial drives or environments with heavy side loads, verify that the pulley's rated torque capacity meets your application requirements before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these pulleys corrode in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance. For consistently humid or mildly corrosive environments, an anodized finish variant (where available) offers additional protection. For harsh outdoor or chemical exposure, consider stainless steel alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a 6.35 mm bore pulley on a 1\/4-inch shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. 6.35 mm is the metric equivalent of 1\/4 inch (0.25 in), so the 6.35 mm bore variant is the correct choice for standard 1\/4-inch motor or drive shafts. Tighten the set-screw firmly to prevent rotational slip under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model, 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":"BF-type \/ 20T \/ 4mm \u0026 10mm","offer_id":52444855763218,"sku":"GLFBBYWGLBZSJ067531x1","price":3.71,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 20T \/ 5mm \u0026 10mm","offer_id":52444855795986,"sku":"GLFBBYWGLBZSJ067532x1","price":3.58,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 20T \/ 6mm \u0026 10mm","offer_id":52444855828754,"sku":"GLFBBYWGLBZSJ067533x1","price":3.58,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 20T \/ 6.35mm \u0026 10mm","offer_id":52444855861522,"sku":"GLFBBYWGLBZSJ067534x1","price":3.58,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 20T \/ 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