{"product_id":"xl-synchronous-pulley-bore-3-20mm-for-width-10mm-timing-belt-10-19teeth-gear","title":"XL Synchronous Pulley Bore 3-20mm for Width 10mm Timing Belt 10-19teeth Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eXL Synchronous Pulley — Precision Timing Drive for 10mm Wide Belts\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched pulley throws off your CNC router, 3D printer, or conveyor drive, every axis move becomes unreliable. Engineers and makers who need repeatable, zero-backlash motion depend on a correctly sized XL synchronous pulley matched to their shaft bore and belt width. This XL timing pulley is designed for that exact scenario — a direct drop-in for 10mm wide XL-pitch timing belts across a wide range of shaft sizes.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy, featuring an XL tooth profile (pitch 5.08mm \/ 0.200 in) and a finished bore ranging from 3.175mm (0.125 in) to 20mm (0.787 in). Tooth counts span 10T to 19T, covering outer diameters from approximately 16mm (0.63 in) to 31mm (1.22 in). Two hub styles are available: BF-type (flanged, no set screw) and K-type (with keyway and set screw), letting you match the pulley to your shaft retention method.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router X\/Y axis drives requiring a compact 10T–12T pulley on a 5mm or 6mm motor shaft, 3D printer extruder and motion systems using 14T–17T pulleys on NEMA stepper shafts (5mm bore), and light industrial conveyor or indexing table drives where a 19T K-type pulley on a 16–20mm shaft provides the needed gear ratio and positive locking.\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 \u003cstrong\u003eXL-pitch (5.08mm \/ 0.200\")\u003c\/strong\u003e timing belts, \u003cstrong\u003e10mm belt width\u003c\/strong\u003e. Verify your shaft diameter and hub style (BF or K) before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These XL Synchronous Timing Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eWide Bore Range\u003c\/strong\u003e\u003cbr\u003eBore options from 3.175mm to 20mm cover miniature motor shafts through mid-size industrial shafts — no custom machining needed for common shaft sizes.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e \u003cstrong\u003e10 to 19 Tooth Selection\u003c\/strong\u003e\u003cbr\u003eFive tooth counts (10T, 12T, 14T, 17T, 19T) let you dial in the exact drive ratio for your motion system without compromising belt engagement.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eBF-Type \u0026amp; K-Type Hub Styles\u003c\/strong\u003e\u003cbr\u003eBF-type offers a clean flanged bore for press-fit or adhesive retention; K-type includes a keyway slot and set screw for positive shaft locking under load.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eXL Pitch Tooth Profile\u003c\/strong\u003e\u003cbr\u003eThe 5.08mm XL pitch delivers reliable synchronous power transmission with low noise and minimal tooth wear across typical RPM ranges for CNC and automation drives.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\u003cbr\u003eLightweight yet rigid aluminum body keeps rotational inertia low — important for servo and stepper motor systems where acceleration response matters.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSingle or Multi-Pack Options\u003c\/strong\u003e\u003cbr\u003eAvailable in 1, 2, or 3-piece packs so you can stock spares or equip multiple axes in one order at a lower per-unit cost.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — XL Synchronous Timing 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\u003e5.08mm (0.200 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e10mm (0.394 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e10T, 12T, 14T, 17T, 19T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Range\u003c\/th\u003e\n\u003ctd\u003e3.175mm – 20mm (0.125 in – 0.787 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eBF-type (flanged bore) \/ K-type (keyway + set screw)\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\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Diameter (approx.)\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\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 Pcs \/ 2 Pcs \/ 3 Pcs\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\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 the pulley's pitch diameter and, combined with your driven pulley's tooth count, sets the drive ratio. For CNC and 3D printer motion systems, 10T–14T pulleys on the motor side are common for compact, high-resolution setups. Use 17T–19T when you need higher belt speed or a larger pitch diameter to reduce belt wrap angle on longer center distances. Match the tooth count to your belt length and center distance calculation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between BF-type and K-type hubs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBF-type (Blind Flange) pulleys have a plain finished bore with flanges on both sides of the belt groove. They rely on press-fit, adhesive, or an external collar for shaft retention — common in light-load or fixed-shaft applications. K-type pulleys include a keyway slot and a set screw, providing positive mechanical locking to the shaft. K-type is recommended for applications with reversing loads, higher torque, or where shaft slippage would cause positioning errors.\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 5mm output shaft. Select the 5mm bore option. If your motor has a flat (D-cut) shaft, the BF-type bore will still fit; for a fully round shaft with positive locking, choose the K-type with a set screw. Always measure your actual shaft diameter with calipers before ordering, as some motors vary slightly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with GT2 or HTD belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. This pulley is machined specifically for the XL tooth profile (5.08mm pitch, trapezoidal tooth form). GT2 belts use a 2mm pitch curvilinear profile, and HTD belts use a different curvilinear pitch. Mixing tooth profiles causes poor engagement, accelerated wear, and potential belt skipping. Confirm your belt is XL-pitch before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum pulley under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for the torque and speed ranges typical of CNC routers, 3D printers, laser cutters, and light conveyor systems. For heavy industrial applications with sustained high torque or shock loads, verify the pulley's rated load against your system's peak torque. The K-type hub with set screw provides additional security against rotational slippage compared to the BF-type plain bore.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum has natural corrosion resistance, but the machined bore and keyway areas are bare metal and can oxidize over time in humid or wet conditions. For outdoor or washdown environments, apply a light machine oil to the bore and set screw area, or consider a stainless steel pulley for long-term corrosion resistance. The anodized outer surface provides additional protection for the belt-contact area.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo the multi-pack options (2 Pcs \/ 3 Pcs) include the same tooth count and bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. When you select a specific Teeths + Bores + Types \u0026amp; Amounts combination, all pieces in a 2 Pcs or 3 Pcs pack are identical — same tooth count, same bore diameter, and same hub style. This is useful for equipping multiple axes with the same pulley or keeping spares on hand without placing separate orders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Teeths, Bores, and Types \u0026amp; Amounts above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"10T \/ 3.175mm \/ BF-type \u0026 1Pcs","offer_id":52444279308562,"sku":"GY$$$GLBZSJ066748x1","price":4.19,"currency_code":"USD","in_stock":true},{"title":"10T \/ 4mm \/ BF-type \u0026 1Pcs","offer_id":52444279341330,"sku":"GY$$$GLBZSJ066749x1","price":3.56,"currency_code":"USD","in_stock":true},{"title":"10T \/ 5mm \/ BF-type \u0026 1Pcs","offer_id":52444279374098,"sku":"GY$$$GLBZSJ066750x1","price":3.28,"currency_code":"USD","in_stock":true},{"title":"10T \/ 6mm \/ BF-type \u0026 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