{"product_id":"xl-timing-belt-pulley-bf-type-pitch-5-08mm-10t-80t-cnc-3d-printer","title":"XL Timing Belt Pulley BF-Type Pitch 5.08mm 10T 11T 12T - 80T For CNC, 3D Printer","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eXL Timing Belt Pulley BF-Type — Precision 5.08mm Pitch Drive for CNC \u0026amp; 3D Printers\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router skips steps or your 3D printer loses positional accuracy, the culprit is often a mismatched or worn timing pulley. Engineers, makers, and small-batch manufacturers who demand repeatable motion control need a pulley that holds tight tolerances across every tooth. These XL BF-type timing belt pulleys are machined to the XL (Extra Light) standard with a 5.08 mm (0.200 in) pitch, giving you a direct drop-in solution for standard XL belt drive systems.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy, offering a balance of low rotational inertia and structural rigidity. The BF-type flange configuration keeps the belt tracking reliably on the pulley face. Available tooth counts span from 10T to 80T, with a fixed 10 mm (0.39 in) compatible belt width. Bore diameter and set-screw configuration vary by tooth count — see variant options for exact bore specs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include XL belt CNC router axis drives, FDM 3D printer X\/Y motion systems, desktop laser engraver gantries, and lightweight robotics joint actuators — all applications where an XL timing belt pulley BF-type with 5.08 mm pitch delivers the low-backlash positioning these builds require.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatible with:\u003c\/strong\u003e Standard XL timing belts (5.08 mm \/ 0.200 in pitch) — 10 mm belt width. Verify bore diameter against your shaft size before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These XL BF-Type Timing Belt Pulleys\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eXL Standard 5.08 mm Pitch\u003c\/strong\u003e — Conforms to the XL (Extra Light) timing belt profile for direct compatibility with standard XL belts used in CNC and 3D printer drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eBF-Type Flanged Design\u003c\/strong\u003e — Dual-flange construction keeps the belt centered on the pulley, reducing lateral drift and belt wear in high-cycle motion applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪙\u003c\/span\u003e\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e — Lightweight yet rigid material reduces rotational inertia for faster acceleration and deceleration in servo and stepper motor systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (10T – 80T)\u003c\/strong\u003e — 51 variants from 10 to 80 teeth let you dial in the exact gear ratio your drive system needs without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003e10 mm Belt Width Compatibility\u003c\/strong\u003e — Matched to standard 10 mm wide XL belts, the most common width in desktop CNC and 3D printer motion platforms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eSet-Screw Shaft Retention\u003c\/strong\u003e — Includes set-screw bore for secure shaft mounting; bore diameter varies by tooth count — see variant options for your specific size.\u003c\/li\u003e\n\u003c\/ul\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 Profile\u003c\/th\u003e\n\u003ctd\u003eXL (Extra Light)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e5.08 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)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 80T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e10 mm (0.39 in)\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 Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Configuration\u003c\/th\u003e\n\u003ctd\u003eDouble flange (BF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Retention\u003c\/th\u003e\n\u003ctd\u003eSet screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ machined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackage Quantity\u003c\/th\u003e\n\u003ctd\u003e1 PCS per order\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 application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the ratio. For CNC routers and 3D printers, common drive pulleys are 20T paired with larger idler or driven pulleys. Match the tooth count to your existing belt loop length and axis travel requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat belt profile and pitch does this pulley use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are machined for the XL (Extra Light) belt profile with a 5.08 mm (0.200 in) pitch. They are not compatible with GT2, T5, T10, or other profiles. Always confirm your belt's pitch before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat belt width is compatible with this pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe pulley flange is designed for 10 mm wide XL timing belts. Using a narrower or wider belt may cause tracking issues or belt edge wear. Confirm your belt width before selecting a variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the bore diameter, and can I use it on my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count. Please check the variant detail or contact us to confirm the bore size for your selected tooth count. The pulley uses a set-screw for shaft retention, which works with standard round shafts. If you need a specific bore size, please reach out before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the aluminum construction strong enough for my CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are the industry standard for desktop CNC routers, 3D printers, and light-duty automation. They provide sufficient strength for typical belt tension loads in these applications while keeping rotational mass low. For heavy industrial drives with very high belt tension, a steel pulley may be more appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the BF-type flange prevent belt derailment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The BF-type double-flange design physically constrains the belt on both sides of the pulley face, preventing lateral drift during operation. This is especially useful on long-travel axes where belt alignment can shift under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley in a 3D printer extruder or direct-drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are designed for XL belt drive systems, which are common in Cartesian and CoreXY 3D printer motion platforms. They are not typically used in extruder direct-drive mechanisms, which usually use MK8 or similar hobbed gears. For X\/Y axis belt drives using XL belts, these pulleys are a direct fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install and secure the pulley on my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSlide the pulley onto your motor or idler shaft, align it with your belt path, then tighten the set screw against the shaft using an appropriate hex key. For best retention, ensure the shaft surface is clean and consider applying a small amount of thread-locking compound to the set screw if vibration is present in your application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count (Number of Gear Teeth) 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 10T \/ 10mm \u0026 1PCS","offer_id":52445814063378,"sku":"GYJLTGLBZSJ067401x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ XL 11T \/ 10mm \u0026 1PCS","offer_id":52445814096146,"sku":"GYJLTGLBZSJ067402x1","price":4.32,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ XL 12T \/ 10mm \u0026 1PCS","offer_id":52445814128914,"sku":"GYJLTGLBZSJ067403x1","price":4.42,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ XL 13T \/ 10mm \u0026 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