{"product_id":"u-grooved-pulley-aluminum-round-belt-4-5mm-od-20-80mm","title":"U Grooved Pulley PU Round Belt Pulleys Aluminum For 4\/5mm Width Belt OD 20-80mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eU Grooved Aluminum Pulleys for 4\/5mm Round Belts — Precise, Lightweight Drive Components\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or robotics project demands a reliable, slip-free belt drive, mismatched pulleys are the first point of failure. Engineers, makers, and automation builders who work with round PU belts need a pulley that holds groove geometry tightly and mounts without play — this U grooved aluminum pulley is built for exactly that.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a clean U-shaped groove sized for either 4 mm or 5 mm round PU belts. Outer diameters span 20 mm to 80 mm (approximately 0.79 in to 3.15 in), and bore diameters range from 3 mm to 20 mm (approximately 0.12 in to 0.79 in), covering the most common shaft sizes used in light-duty drive systems. The compact, single-piece body keeps rotating mass low while maintaining dimensional accuracy.\u003c\/p\u003e\n\u003cp\u003eTypical applications include open-loop and closed-loop belt conveyors for tabletop automation, axis drives on desktop CNC machines, tensioner and idler positions in 3D printer motion systems, and custom robotic arm joints where a round-belt drive reduces backlash compared to chain or gear alternatives.\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 4 mm or 5 mm diameter round PU belts. Select the Groove Width\/OD option that matches your belt width and required pulley diameter, then choose the Bore Diameter that fits your shaft.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These U Grooved Aluminum Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eDual Belt-Width Compatibility\u003c\/strong\u003e\n\u003cp\u003eAvailable in groove widths for both 4 mm and 5 mm round PU belts, letting you standardize one pulley family across multiple machine axes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide OD Range: 20–80 mm\u003c\/strong\u003e\n\u003cp\u003eSix outer diameter steps (20, 30, 40, 50, 60, 80 mm) give you precise speed-ratio control 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: 3–20 mm\u003c\/strong\u003e\n\u003cp\u003eEighteen bore sizes from 3 mm to 20 mm accommodate the most common motor and idler shaft diameters used in light-duty automation.\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\u003eMachined aluminum keeps the pulley lightweight, reducing inertia on high-cycle axes while providing adequate strength for round-belt tension loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eAccurate U-Groove Profile\u003c\/strong\u003e\n\u003cp\u003eThe groove geometry is matched to round PU belt cross-sections, keeping the belt centered and reducing lateral drift during operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eVersatile Drive and Idler Use\u003c\/strong\u003e\n\u003cp\u003eSuitable as a drive pulley on a motor shaft or as a tensioner\/idler — the bore range and compact body make it adaptable to both roles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — U Grooved Aluminum Pulley\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eGroove Type\u003c\/th\u003e\n\u003ctd\u003eU-groove (round belt profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e4 mm or 5 mm (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e20 \/ 30 \/ 40 \/ 50 \/ 60 \/ 80 mm (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e3 \/ 4 \/ 5 \/ 6 \/ 7 \/ 8 \/ 9 \/ 10 \/ 11 \/ 12 \/ 13 \/ 14 \/ 15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20 mm (select variant)\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\u003eHub \/ Flange Style\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw\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 the correct groove width — 4 mm or 5 mm?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the cross-sectional diameter of your round PU belt. If it is 4 mm, select a Groove Width\/OD option starting with \"4mm\". If it is 5 mm, select one starting with \"5mm\". Using a groove that is too narrow will pinch the belt; too wide will allow lateral movement and reduce tracking accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the right outer diameter (OD) for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe OD determines your drive ratio. Divide the driven pulley OD by the drive pulley OD to get the speed reduction ratio. For example, a 40 mm driven pulley paired with a 20 mm drive pulley gives a 2:1 reduction. Choose the OD combination that achieves your target speed or torque ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I order for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or idler shaft diameter with a caliper. Select the bore diameter that matches exactly — for example, a 6 mm shaft requires the 6 mm bore option. If you plan to use a set screw or keyway adapter, confirm the hub wall thickness is sufficient for your shaft size before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley strong enough for continuous-duty automation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are machined from aluminum alloy and are suited for light-to-medium duty round-belt drives typical of desktop CNC machines, 3D printers, and small robotic systems. For heavy industrial loads or high-tension applications, verify that the belt tension does not exceed the structural limits of the aluminum hub and bore wall.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this pulley corrode in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For humid, wet, or outdoor use, consider applying a light coating of machine oil or a corrosion inhibitor to the bore and outer surfaces. Anodized variants offer improved surface protection if available in your selected size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this as an idler or tensioner pulley instead of a drive pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The U-groove profile and bore range make these pulleys suitable for idler and tensioner positions. When used as an idler, mount the pulley on a fixed or adjustable shaft through the bore and allow it to spin freely using a bearing or bushing — the pulley body itself does not include an integrated bearing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm the pulley fits before I finalize my design?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCheck three dimensions: (1) groove width matches your belt diameter, (2) OD gives the correct drive ratio with your mating pulley, and (3) bore diameter matches your shaft. If you are prototyping, ordering one piece first to verify fit before committing to a larger quantity is a practical approach.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Groove Width\/OD 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":"4mm\/20mm \/ 3mm \/ 1Pcs","offer_id":52445392961810,"sku":"FXLGB793-0","price":8.09,"currency_code":"USD","in_stock":true},{"title":"4mm\/20mm \/ 4mm \/ 1Pcs","offer_id":52445392994578,"sku":"FXLGB793-1","price":8.09,"currency_code":"USD","in_stock":true},{"title":"4mm\/20mm \/ 5mm \/ 1Pcs","offer_id":52445393027346,"sku":"FXLGB793-2","price":8.09,"currency_code":"USD","in_stock":true},{"title":"4mm\/20mm \/ 6mm \/ 1Pcs","offer_id":52445393060114,"sku":"FXLGB793-3","price":8.09,"currency_code":"USD","in_stock":true},{"title":"4mm\/20mm \/ 7mm \/ 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