{"product_id":"v-grooved-aluminum-pulley-pu-round-belt-6mm-od-20-100mm","title":"V Grooved Pulley PU Round Belt Pulleys Aluminum For 6mm Width Belt OD 20mm-100mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eV Grooved Aluminum Pulleys for 6mm PU Round Belts — Precise, Lightweight Drive Components\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, robotics platform, or custom automation rig demands reliable belt drive performance, a poorly fitted pulley creates slip, vibration, and premature belt wear. Engineers, makers, and DIY builders who work with 6mm round polyurethane belts need a pulley that holds the belt firmly in the groove without wobble or misalignment. These V grooved aluminum pulleys are machined to deliver consistent, low-friction rotation across a wide range of shaft sizes and wheel diameters.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy, offering a lightweight yet rigid construction. The V-groove profile is sized specifically for 6mm width PU round belts. Outer diameters span from 20mm (~0.79 in) to 100mm (~3.94 in), and bore diameters range from 4mm to 25mm, covering the most common shaft sizes used in maker and industrial applications. A set screw secures the pulley to the shaft for positive, slip-free engagement.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC machine axis drives where smooth belt tracking is critical, 3D printer and laser cutter belt systems requiring precise OD-to-bore ratios, and custom conveyor or pick-and-place automation builds where a lightweight aluminum V groove pulley for round belt reduces rotational inertia and improves response time.\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 6mm diameter PU round belts. Verify your shaft diameter matches the selected bore size before ordering. Set screw included for shaft fixation.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These V Grooved Aluminum Pulleys\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e — Lightweight and rigid material keeps rotational inertia low while maintaining dimensional stability under continuous operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e6mm V-Groove Profile\u003c\/strong\u003e — Groove geometry matched precisely to 6mm PU round belts, ensuring the belt seats fully and tracks without lateral drift.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide OD Range: 20–100mm\u003c\/strong\u003e — Six outer diameter options (20 \/ 30 \/ 40 \/ 60 \/ 80 \/ 100mm) let you dial in the exact drive ratio your system requires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eMulti-Bore Compatibility\u003c\/strong\u003e — Bore sizes from 4mm to 25mm accommodate a broad range of motor and idler shaft diameters used in CNC, robotics, and automation builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eSet Screw Shaft Fixation\u003c\/strong\u003e — Integrated set screw bore allows secure, tool-tightened attachment to the shaft, preventing rotational slip under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eDrop-In Fit for Standard Drive Systems\u003c\/strong\u003e — Machined to consistent tolerances so the pulley installs directly onto standard shafts without additional machining or adapters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — V Grooved Aluminum 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\u003eBelt Type Compatibility\u003c\/th\u003e\n\u003ctd\u003e6mm Width PU Round Belt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Type\u003c\/th\u003e\n\u003ctd\u003eV-Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e20 \/ 30 \/ 40 \/ 60 \/ 80 \/ 100mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 \/ 7 \/ 8 \/ 10 \/ 11 \/ 12 \/ 14 \/ 15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20 \/ 22 \/ 24 \/ 25mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Fixation\u003c\/th\u003e\n\u003ctd\u003eSet Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural Aluminum (uncoated)\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 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\u003eWhich belt type is this pulley designed for?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are machined with a V-groove sized for 6mm diameter PU (polyurethane) round belts. They are not intended for flat belts, toothed timing belts, or belts with a different cross-section diameter. Using the correct belt profile ensures the belt seats fully in the groove and tracks without slipping sideways.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bore diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or idler shaft diameter with a caliper before ordering. The bore diameter of the pulley must match your shaft diameter. Available bore sizes range from 4mm to 25mm. If your shaft is metric, select the exact matching bore. The set screw allows fine clamping adjustment, but the bore must be the correct nominal size for a proper fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct outer diameter (OD) for my drive ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDrive ratio is determined by the ratio of the driver pulley OD to the driven pulley OD. For example, a 20mm driver paired with a 60mm driven pulley gives a 3:1 reduction. Choose your OD combination based on the speed and torque requirements of your application. Six OD options — 20, 30, 40, 60, 80, and 100mm — are available to cover a wide range of drive ratio configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the set screw included, and what tool does it require?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, a set screw is included with each pulley. Set screws on pulleys of this type typically require a hex (Allen) key for tightening. The specific hex key size depends on the set screw diameter, which varies by pulley size. A standard metric hex key set will cover all variants in this range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this pulley be used as an idler (non-driven) pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pulleys can function as both driver\/driven pulleys (fixed to a shaft via set screw) and as idler pulleys when mounted on a bearing-supported shaft or axle. For idler use, ensure the bore fits your idler shaft and that the shaft is free to rotate or that a bearing is used between the shaft and pulley bore as needed by your design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the corrosion resistance of aluminum pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. These pulleys are suitable for dry or lightly humid workshop and lab conditions. For outdoor or high-humidity environments, consider applying a light coating of machine oil or using an anodized variant if available. Avoid prolonged exposure to salt spray or aggressive chemicals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with 3D printers or laser cutters?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided your machine uses 6mm PU round belts and the shaft diameter matches one of the available bore sizes. Many DIY 3D printers, laser cutters, and CNC routers use round belt drive systems. Verify the OD fits your belt path geometry and that the bore matches your motor shaft before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the load capacity of these pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eExact load ratings depend on the specific OD, bore, and operating speed of your application. Aluminum alloy pulleys of this type are suitable for light-to-medium duty drive applications typical of CNC machines, robotics, and automation equipment. For heavy industrial loads or high-speed continuous operation, consult your system's belt tension and torque requirements against the pulley's cross-section to confirm suitability.\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":"20mm \/ 4mm \/ 1Pcs","offer_id":52445390799122,"sku":"FXLGB791-0","price":5.51,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 5mm \/ 1Pcs","offer_id":52445390831890,"sku":"FXLGB791-1","price":5.51,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 6mm \/ 1Pcs","offer_id":52445390864658,"sku":"FXLGB791-2","price":5.51,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 8mm \/ 1Pcs","offer_id":52445390897426,"sku":"FXLGB791-3","price":5.51,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 10mm \/ 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