{"product_id":"xl-timing-belt-pulley-bf-k-type-15-25-teeth-bore-5-20mm","title":"Timing Belt Pulley Bore 5 - 20mm Clamping Type 15 - 25 Teeth XL Timing Belt BF\/K","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eXL Timing Belt Pulleys — Clamping-Type BF\/K for Precise Motion Control\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or automation rig demands slip-free, repeatable motion, the wrong pulley becomes the weakest link in the entire drive train. Engineers and makers who need a reliable XL timing belt pulley with a secure bore fit — without the hassle of set-screw slippage — will find the clamping-style BF and K designs in this listing purpose-built for that job.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with an anodized finish, featuring an XL-pitch tooth profile (5.080 mm \/ 0.200 in pitch). Bore diameters range from 5 mm to 20 mm (approx. 0.197 in – 0.787 in), and tooth counts span 15, 18, 20, 24, and 25 teeth. The BF-type uses a through-bore with flanges on both sides; the K-type adds a clamping collar for tool-free shaft retention.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include desktop CNC gantry drives requiring backlash-free XL belt pulleys, stepper-motor output shafts on laser engravers needing a 5 mm bore XL pulley, and servo-driven conveyor systems where a 20-tooth or 24-tooth XL timing pulley keeps indexing accurate across thousands of cycles.\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 XL-pitch (1\/5 in \/ 5.080 mm) timing belts. Verify bore diameter and tooth count match your shaft and belt width before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These XL 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 Clamping Styles\u003c\/strong\u003e\n\u003cp\u003eChoose BF-type (flanged through-bore) for standard belt tracking, or K-type (clamping collar) for tool-free shaft locking — both eliminate set-screw marks on precision shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Bore Range\u003c\/strong\u003e\n\u003cp\u003eAvailable in 5, 6, 6.35, 7, 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, and 20 mm bores to fit stepper, servo, and NEMA motor shafts without adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eXL-Pitch Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eStandard 5.080 mm (0.200 in) XL pitch ensures direct interchangeability with off-the-shelf XL timing belts used in CNC, robotics, and lab automation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eAnodized Aluminum Construction\u003c\/strong\u003e\n\u003cp\u003eLightweight aluminum body with anodized surface treatment resists corrosion and wear, keeping tooth geometry accurate over extended duty cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eMultiple Tooth Counts\u003c\/strong\u003e\n\u003cp\u003e15, 18, 20, 24, and 25-tooth options let you dial in exact speed ratios and torque multiplication for your specific drive design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eFlanged Belt Retention\u003c\/strong\u003e\n\u003cp\u003eIntegrated flanges on BF-type pulleys keep the XL belt centered on the pulley face, reducing edge wear and preventing belt walk in high-cycle applications.\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 — XL Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eXL (Extra Light)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e5.080 mm (0.200 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eBF-type (flanged) \/ K-type (clamping collar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e15 \/ 18 \/ 20 \/ 24 \/ 25 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 – 20 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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eAnodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange\u003c\/th\u003e\n\u003ctd\u003eBoth sides (BF-type); See variant options (K-type)\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\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\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\u003eThe BF-type has flanges on both sides of the tooth face and uses a standard through-bore — ideal when you want belt tracking and plan to secure the pulley with a key or set screw on your own. The K-type adds a clamping collar that tightens around the shaft without a set screw, making it easier to reposition and less likely to damage polished motor shafts. Choose K-type when you need tool-free adjustment or frequently swap pulleys during prototyping.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore diameter 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, the clamping K-type is recommended for a more secure grip. For NEMA 23 motors with an 8 mm shaft, choose the 8 mm bore option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tooth count gives me a 1:1 drive ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUse the same tooth count on both the drive and driven pulleys for a 1:1 ratio. For example, pair a 20-tooth pulley on the motor with a 20-tooth pulley on the driven shaft. To reduce speed and increase torque, use a smaller tooth count on the motor side and a larger count on the driven side (e.g., 15T drive → 25T driven = 1:1.67 reduction).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with standard XL timing belts sold elsewhere?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pulleys follow the standard XL pitch of 5.080 mm (0.200 in), which is an industry-wide specification. They are compatible with any XL-pitch timing belt of the appropriate width. Confirm the belt width matches the pulley's tooth face width before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow corrosion-resistant are these pulleys for outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anodized aluminum surface provides moderate corrosion resistance suitable for indoor automation, light industrial, and workshop environments. For prolonged outdoor exposure or high-humidity conditions, consider applying a light machine oil to the bore and tooth surfaces periodically. These pulleys are not rated for submersion or marine environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys with a 6.35 mm (1\/4 inch) shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The 6.35 mm bore variant is specifically included to accommodate 1\/4-inch imperial shafts common in North American servo motors and hobby CNC spindles. Select \"6.35mm \u0026amp; 1PCS\" from the Bore Diameter option when ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum RPM or torque rating for these pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSpecific RPM and torque ratings depend on the belt width, tension, and application load — values that vary by installation. As a general guideline, aluminum XL pulleys in this size range are commonly used in applications up to 3,000 RPM with light-to-medium loads typical of desktop CNC and 3D printing. For high-torque or high-speed industrial applications, contact us to confirm suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Product Type, Number of Gear 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 \/ XL 15 Teeth \/ 5mm \u0026 1PCS","offer_id":52444983525650,"sku":"GYJLTGLBZSJ064490x1","price":13.57,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ XL 15 Teeth \/ 6mm \u0026 1PCS","offer_id":52444983558418,"sku":"GYJLTGLBZSJ064491x1","price":13.84,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ XL 15 Teeth \/ 6.35mm \u0026 1PCS","offer_id":52444983591186,"sku":"GYJLTGLBZSJ064492x1","price":13.84,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ XL 15 Teeth \/ 7mm \u0026 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