{"product_id":"l-type-14-40t-synchronous-timing-pulley-bore-5mm-30mm-20mm-belt-cnc-3d","title":"L-Type 14-40T Synchronous Timing Pulley Bore 5mm-30mm for 20mm Width Belt CNC 3D","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eL-Type Synchronous Timing Pulley — Precision Drive for CNC, 3D Printing \u0026amp; Robotics\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a mismatched or worn timing pulley. Engineers, makers, and automation builders who demand repeatable, slip-free motion need a synchronous pulley that fits their shaft exactly and meshes cleanly with their belt — every single cycle. These L-type synchronous timing pulleys are engineered for that purpose, available in a wide tooth count range from 14T to 40T with bore diameters from 5mm to 30mm (0.20\" to 1.18\").\u003c\/p\u003e\n\u003cp\u003eEach pulley features an L-pitch tooth profile (9.525mm \/ 0.375\" pitch) machined to accept a 20mm-wide (0.79\") synchronous belt. The tooth width is 21mm, providing full belt engagement with standard 20mm L-type belts. Bore diameters span 5mm through 30mm (0.20\"–1.18\"), and tooth counts range from 14T to 40T, covering a broad spectrum of drive ratios. Material is aluminum alloy with a natural or anodized finish, offering a balance of light weight and structural rigidity suitable for continuous-duty motion applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router X\/Y axis drives requiring precise linear positioning, FDM 3D printer extruder and motion systems where consistent belt tension is critical, and light industrial conveyor or robotic arm joints where a synchronous L-type timing pulley with custom bore diameter eliminates adapter sleeves and shaft play.\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 L-pitch (9.525mm) synchronous belts, 20mm width. Verify your shaft diameter matches the selected bore before ordering. Set-screw or keyway finishing may be required for your application.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These L-Type Synchronous Timing Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Selection\u003c\/strong\u003e\n\u003cp\u003eAvailable from 14T to 40T, enabling a broad range of drive ratios for speed reduction or torque multiplication in CNC and automation systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eMulti-Bore Options (5mm–30mm)\u003c\/strong\u003e\n\u003cp\u003eBore diameters from 5mm to 30mm (0.20\"–1.18\") accommodate common motor and shaft sizes without requiring custom machining or adapter bushings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eL-Pitch Profile for Zero-Slip Drive\u003c\/strong\u003e\n\u003cp\u003eThe 9.525mm L-pitch tooth geometry provides positive engagement with L-type synchronous belts, eliminating the slip and backlash common in friction-drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003e21mm Tooth Width for 20mm Belts\u003c\/strong\u003e\n\u003cp\u003eThe 21mm tooth width provides full-width engagement with standard 20mm L-type belts, maximizing load distribution and reducing belt edge wear.\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 aluminum alloy body reduces rotational inertia for faster acceleration and deceleration in dynamic motion control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement Compatibility\u003c\/strong\u003e\n\u003cp\u003eStandard L-pitch dimensions ensure direct interchangeability with other L-type pulleys in existing CNC, 3D printer, and conveyor drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — L-Type Synchronous Timing Pulley\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eL-pitch synchronous belt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e9.525mm (0.375\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e20mm (0.79\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Width\u003c\/th\u003e\n\u003ctd\u003e21mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (Variants)\u003c\/th\u003e\n\u003ctd\u003e14T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 28T, 30T, 40T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (Variants)\u003c\/th\u003e\n\u003ctd\u003e5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 15mm, 17mm, 20mm, 25mm, 30mm\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\u003eSee variant options\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\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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 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 tooth count by the drive pulley tooth count to get the ratio. For example, a 14T drive pulley paired with a 28T driven pulley gives a 2:1 reduction, halving speed and doubling torque. For CNC routers and 3D printers, 14T–20T drive pulleys are most common for direct motor coupling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct bore diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or shaft diameter with a caliper. Select the bore that matches your shaft exactly — a bore that is too large will cause runout and positioning errors. If your shaft falls between listed sizes, select the next larger bore and use a set screw or keyway to secure it, or have the bore finish-machined to your exact shaft diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with standard L-type timing belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pulleys use the standard L-pitch profile (9.525mm pitch) and are designed for 20mm-wide L-type synchronous belts. They are interchangeable with other L-pitch pulleys from any manufacturer that follows the standard L-belt tooth geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat material are these pulleys made from, and will they corrode?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe pulleys are machined from aluminum alloy, which has inherent corrosion resistance in typical indoor environments. For humid or outdoor applications, an anodized finish provides additional protection. Avoid prolonged exposure to salt spray or strong acids without additional surface treatment.\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 or CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. L-type pulleys are widely used in CNC router axis drives and some larger-format 3D printer motion systems. Confirm that your belt is L-pitch (9.525mm) and 20mm wide before ordering. Smaller desktop 3D printers typically use GT2 or T5 belts — verify your belt type before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these pulleys include a set screw or keyway?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSet screw and keyway availability varies by variant. Please contact us to confirm the hub configuration for your selected tooth count and bore combination before ordering if your application requires a specific retention method.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between tooth width and belt width?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTooth width (21mm on these pulleys) refers to the axial width of the pulley's toothed section. Belt width (20mm) is the width of the belt itself. The pulley tooth width is intentionally slightly wider than the belt to allow the belt to track centrally without riding against the flanges, which reduces edge wear and noise.\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 and Bore Dia above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"14T \/ 21mm \/ 5mm","offer_id":52444011364626,"sku":"BGML14TC21D5YFx1","price":20.59,"currency_code":"USD","in_stock":true},{"title":"14T \/ 21mm \/ 6mm","offer_id":52444011397394,"sku":"BGML14TC21D6YFx1","price":20.5,"currency_code":"USD","in_stock":true},{"title":"14T \/ 21mm \/ 7mm","offer_id":52444011430162,"sku":"BGML14TC21D7YFx1","price":20.5,"currency_code":"USD","in_stock":true},{"title":"14T \/ 21mm \/ 8mm","offer_id":52444011462930,"sku":"BGML14TC21D8YFx1","price":20.37,"currency_code":"USD","in_stock":true},{"title":"14T \/ 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