{"product_id":"u-grooved-pulley-pu-round-belt-pulleys-aluminum-od-15-30mm","title":"U Grooved Pulley PU Round Belt Pulleys Aluminum Groove Width 3mm OD 15-30mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eU Groove Pulleys for Round Belt Drives — Precision Aluminum, OD 15–30mm\u003c\/h2\u003e\n\u003cp\u003eWhen your belt-drive project demands consistent tracking and slip-free power transfer, a poorly matched pulley becomes the weakest link. Engineers, robotics builders, and CNC hobbyists who rely on PU round belts need a pulley that holds tight tolerances and resists wear across thousands of cycles — that's exactly where these U grooved pulleys deliver.\u003c\/p\u003e\n\u003cp\u003eEach U grooved pulley is machined from aluminum alloy, featuring a clean U-profile groove with a fixed 3mm groove width designed to seat standard PU round belts securely. Outer diameters span 15mm to 30mm (0.59 in to 1.18 in), with bore diameters ranging from 2mm to 15mm (0.08 in to 0.59 in) to fit a wide range of motor shafts and axles. Available in single-groove, double-groove, and triple-groove configurations to match your drive ratio and belt-count requirements.\u003c\/p\u003e\n\u003cp\u003eThese aluminum U groove pulleys are well-suited for small-scale conveyor systems requiring smooth round-belt tracking, desktop CNC machines and laser cutters using PU belt drives, and robotics platforms where compact, lightweight pulleys reduce rotational inertia. The anodized aluminum construction keeps weight low while maintaining the dimensional stability needed for repeatable positioning in maker and automation projects.\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 3mm-diameter PU round belts. Verify bore diameter matches your shaft before ordering. Set screw or press-fit mounting — confirm your shaft retention method.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These U Groove Aluminum Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum body keeps rotational mass low while providing the rigidity needed for consistent belt tracking in continuous-duty applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e3mm U-Profile Groove\u003c\/strong\u003e\n\u003cp\u003eGroove width precisely matched to standard 3mm PU round belts, preventing lateral belt wander and reducing premature belt wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eSingle, Double \u0026amp; Triple Groove Options\u003c\/strong\u003e\n\u003cp\u003eChoose single-groove for simple drives, double-groove for redundancy or dual-belt layouts, or triple-groove for high-torque multi-belt configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eWide OD Range: 15–30mm\u003c\/strong\u003e\n\u003cp\u003eFour outer diameter options (15mm \/ 20mm \/ 25mm \/ 30mm) let you dial in the exact drive ratio your project requires without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eBore Sizes 2–15mm\u003c\/strong\u003e\n\u003cp\u003eSixteen bore diameter options — from 2mm up to 15mm (including 3.17mm and 6.35mm for imperial shafts) — cover the most common motor and axle shaft sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eCompact \u0026amp; Lightweight\u003c\/strong\u003e\n\u003cp\u003eSmall form factor suits space-constrained builds such as desktop CNC gantries, robotic arms, and compact conveyor modules where every gram matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — U Groove Aluminum Pulleys\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 Profile\u003c\/th\u003e\n\u003ctd\u003eU-groove (round belt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Width\u003c\/th\u003e\n\u003ctd\u003e3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e15mm \/ 20mm \/ 25mm \/ 30mm (0.59–1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e2 \/ 3 \/ 3.17 \/ 4 \/ 5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 9 \/ 10 \/ 11 \/ 12 \/ 13 \/ 14 \/ 15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Count\u003c\/th\u003e\n\u003ctd\u003eSingle \/ Double \/ Triple\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt\u003c\/th\u003e\n\u003ctd\u003ePU round belt, 3mm diameter\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\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 OD size should I choose for my drive ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDrive ratio equals the driven pulley OD divided by the driving pulley OD. For example, pairing a 15mm drive pulley with a 30mm driven pulley gives a 2:1 reduction. Select your OD based on the speed reduction or increase your application requires, then confirm the bore matches your motor shaft.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat belt type is compatible with these pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are designed specifically for 3mm-diameter PU (polyurethane) round belts. The U-profile groove seats the round belt securely. Do not use flat belts or V-belts, as the groove geometry will not provide proper engagement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the correct bore diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or axle shaft diameter precisely with calipers. Select the bore that matches your shaft. Note that 3.17mm corresponds to 1\/8 inch and 6.35mm corresponds to 1\/4 inch — common imperial shaft sizes used in many hobby motors and stepper motors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen should I use a double or triple groove pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDouble-groove pulleys allow you to run two parallel belts simultaneously, which increases load capacity or provides redundancy. Triple-groove pulleys are suited for high-torque applications or multi-belt drive systems. For most light-duty robotics and CNC builds, a single-groove pulley is sufficient.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy offers good natural corrosion resistance for indoor and dry environments. For applications exposed to moisture or mild chemicals, the anodized surface finish provides additional protection. These pulleys are not recommended for submerged or highly corrosive environments without additional sealing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow is the pulley secured to the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eShaft retention method depends on the specific variant. Many aluminum pulleys of this type use a set screw (grub screw) to clamp onto the shaft. Confirm your variant includes a set screw or plan to use a press-fit or adhesive retention method appropriate for your torque requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in a CNC machine or laser cutter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The tight OD tolerances and consistent groove profile make these pulleys suitable for desktop CNC routers, laser cutters, and 3D printer extruder drives that use PU round belts. Pair with matching idler pulleys and tensioners for best tracking performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your groove type, 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":"Single Groove\/15mm \/ 2mm \/ 1Pcs","offer_id":52445404463378,"sku":"FXLGB797-0","price":7.96,"currency_code":"USD","in_stock":true},{"title":"Single Groove\/15mm \/ 3mm \/ 1Pcs","offer_id":52445404496146,"sku":"FXLGB797-1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"Single Groove\/15mm \/ 3.17mm \/ 1Pcs","offer_id":52445404528914,"sku":"FXLGB797-2","price":7.96,"currency_code":"USD","in_stock":true},{"title":"Single Groove\/15mm \/ 4mm \/ 1Pcs","offer_id":52445404561682,"sku":"FXLGB797-3","price":7.96,"currency_code":"USD","in_stock":true},{"title":"Single Groove\/15mm \/ 5mm \/ 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