{"product_id":"double-v-grooved-pulley-pu-round-belt-pulleys-aluminum-width-7mm-od-30-80mm","title":"Double V Grooved Pulley PU Round Belt Pulleys Aluminum Width 7mm OD 30-80mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eDouble V Grooved Aluminum Pulleys for PU Round Belts — Precision Motion, Zero Slip\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or light conveyor loses belt tracking, the culprit is often a pulley that was never designed for round belts. Engineers and makers who rely on PU round belt drives need a pulley with a true double-V groove profile to keep the belt centered under load. These double V grooved pulleys are machined for exactly that application, giving hobbyists and automation builders a reliable, drop-in solution.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a 7mm groove width and a double-V cross-section optimized for standard PU round belts. Outer diameters span 30mm to 80mm (approximately 1.18 in to 3.15 in), and bore diameters range from 5mm to 25mm (approximately 0.20 in to 0.98 in) to suit a wide variety of shaft sizes. The aluminum construction keeps rotating mass low while providing adequate rigidity for light-to-medium duty cycles.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include desktop CNC belt-drive axes where round-belt compliance reduces backlash, small robotic arm joints requiring compact pulley geometry, and DIY conveyor systems for maker labs or light assembly lines. The double-V groove profile also suits round-belt tensioning idler applications in 3D printer extruder assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with standard PU round belts. Verify bore diameter matches your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Double V Grooved Aluminum Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eDouble-V Groove Profile\u003c\/strong\u003e\n\u003cp\u003eDual-angled groove walls grip PU round belts on both flanks, preventing lateral drift and maintaining belt alignment under varying loads.\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 from aluminum alloy for a low-inertia rotating mass that responds quickly to speed changes — ideal for servo-driven and stepper-driven axes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide OD Range: 30–80mm\u003c\/strong\u003e\n\u003cp\u003eFour outer diameter options (30, 40, 60, 80mm) let you tune belt speed ratios and torque multiplication without sourcing multiple product lines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMulti-Bore Compatibility\u003c\/strong\u003e\n\u003cp\u003eBore diameters from 5mm to 25mm cover the most common shaft standards, reducing the need for custom adapters or bushings in most builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003e7mm Groove Width\u003c\/strong\u003e\n\u003cp\u003eStandardized 7mm groove width matches widely available PU round belt stock, simplifying belt sourcing and replacement in the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eSmooth Bore Finish\u003c\/strong\u003e\n\u003cp\u003eThe bore is finished to accept a set-screw or interference-fit shaft connection; pair with a matching set-screw collar for secure axial retention.\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 — Double V Grooved Pulley\u003c\/h2\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\u003eDouble V Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Width\u003c\/th\u003e\n\u003ctd\u003e7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003ePU Round Belt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e30mm \/ 40mm \/ 60mm \/ 80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5mm – 25mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\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\u003eWhich PU round belt diameter fits the 7mm groove width?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 7mm groove width is designed for PU round belts with a cross-section diameter of typically 4–6mm. A 5mm or 6mm round belt seats well in the double-V groove and provides good lateral retention. Always verify the belt diameter against the groove depth before assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right OD for my drive ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe drive ratio equals the driven pulley OD divided by the driving pulley OD. For example, pairing a 30mm drive pulley with a 60mm driven pulley gives a 2:1 reduction. Select ODs based on your required output speed and the center distance between shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I order for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOrder the bore diameter that matches your shaft diameter exactly. If your shaft is 8mm, select the 8mm bore variant. For a loose slip-fit, you may need to ream the bore slightly; for a press-fit, consult a machinist. A set-screw collar is recommended for axial retention regardless of fit type.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs aluminum strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium duty belt drives, including desktop CNC machines, 3D printers, and small robotic joints. For heavy industrial conveyor loads or high-shock environments, a steel pulley may be more appropriate. Check your peak torque and belt tension against the pulley's load capacity before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these pulleys 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 outdoor or high-humidity applications, consider applying a clear anodize coating or a light machine oil film to the pulley surface to extend service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as idler pulleys or tensioners?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The double-V groove profile works well as an idler or tensioner for PU round belt systems. Mount the pulley on a bearing-supported shaft or bolt it to an adjustable bracket to apply the correct belt tension. Ensure the idler bore matches your idler shaft diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I secure the pulley to the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe most common method is a radial set-screw through the pulley hub, tightened against a flat on the shaft. Alternatively, a shaft collar with a set-screw can provide axial retention. For higher torque applications, a keyed bore and matching keyway on the shaft offer more reliable torque transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your 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":"30mm \/ 5mm \/ 1Pcs","offer_id":52445704847634,"sku":"FXLGB799-0","price":13.86,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 6mm \/ 1Pcs","offer_id":52445704880402,"sku":"FXLGB799-1","price":13.86,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 7mm \/ 1Pcs","offer_id":52445704913170,"sku":"FXLGB799-2","price":13.86,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 8mm \/ 1Pcs","offer_id":52445704945938,"sku":"FXLGB799-3","price":13.86,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 10mm \/ 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