{"product_id":"u-groove-aluminum-pulley-wheel-od-30-80mm-bearing-pulleys","title":"U-Groove Aluminum Pulley Wheel OD 30\/40\/50\/60\/80mm Bearing Pulleys Hole 5~15mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eU-Groove Aluminum Pulley Wheel — Precision Bearing Pulleys for Rope, Cable \u0026amp; Belt Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a misaligned cable jumps its track or a worn plastic pulley cracks mid-project, the whole mechanism grinds to a halt. Engineers, robotics builders, and workshop makers who need a reliable, dimensionally consistent pulley reach for a machined aluminum solution — one that stays true under load and resists the flex that plagues lighter alternatives.\u003c\/p\u003e\n\u003cp\u003eThese U-groove aluminum pulley wheels are machined from 6061-series aluminum alloy and feature a pre-installed radial bearing at the center bore. Outer diameters span 30 mm (1.18 in) to 80 mm (3.15 in); bore hole sizes range from 5 mm (0.20 in) to 15 mm (0.59 in); groove widths are available in 6 mm or 8 mm to suit different rope and cable diameters. The U-shaped groove profile keeps round-section ropes, cables, and cords seated firmly during operation.\u003c\/p\u003e\n\u003cp\u003eTypical applications include DIY rope-drive linear actuators, CNC cable tensioning systems, 3D-printer filament guide pulleys, small-scale crane and hoist mechanisms, and custom belt-redirect assemblies where a compact, low-friction idler is required.\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 Fits standard round ropes, cables, and cords with diameter up to the selected groove width (6 mm or 8 mm). Bore accepts shafts or bolts matching the selected hole size (5 \/ 6 \/ 7 \/ 8 \/ 10 \/ 12 \/ 15 mm). Verify OD clearance before installation.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These U-Groove Aluminum Pulley Wheels\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003ePre-Installed Radial Bearing\u003c\/strong\u003e\n\u003cp\u003eEach pulley ships with a radial ball bearing pressed into the bore, delivering smooth, low-friction rotation without additional assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Size Matrix\u003c\/strong\u003e\n\u003cp\u003eFive outer diameters (30 \/ 40 \/ 50 \/ 60 \/ 80 mm) combined with bore sizes from 5 to 15 mm and two groove widths (6 mm \/ 8 mm) give you precise fitment across a broad range of builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eMachined Aluminum Construction\u003c\/strong\u003e\n\u003cp\u003eThe wheel body is machined from aluminum alloy, keeping weight low while maintaining dimensional stability under the lateral and radial loads typical of rope and cable drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eU-Groove Profile\u003c\/strong\u003e\n\u003cp\u003eThe symmetrical U-shaped groove seats round-section ropes and cables securely, reducing side-slip and extending the service life of both the pulley and the running line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Finish\u003c\/strong\u003e\n\u003cp\u003eAluminum's natural oxide layer provides baseline corrosion resistance suitable for indoor workshop environments and light-duty outdoor enclosures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e\n\u003cp\u003eStandardized OD and bore dimensions make these pulleys straightforward substitutes for worn or undersized pulleys in existing frames and brackets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — U-Groove Aluminum Pulley Wheel\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 (6061-series, machined)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e30 mm \/ 40 mm \/ 50 mm \/ 60 mm \/ 80 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Hole Diameter\u003c\/th\u003e\n\u003ctd\u003e5 \/ 6 \/ 7 \/ 8 \/ 10 \/ 12 \/ 15 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Width\u003c\/th\u003e\n\u003ctd\u003e6 mm or 8 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Profile\u003c\/th\u003e\n\u003ctd\u003eU-groove (round-section rope\/cable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eRadial ball bearing (pre-installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ machined aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuitable Rope\/Cable Diameter\u003c\/th\u003e\n\u003ctd\u003eUp to groove width (6 mm or 8 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackage Contents\u003c\/th\u003e\n\u003ctd\u003e1 piece per unit (multi-pack options available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Unit\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 outer diameter for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the OD to the space available in your bracket or frame. Larger ODs (60–80 mm) provide a gentler bend radius for the rope or cable, reducing wear on the running line. Smaller ODs (30–40 mm) suit compact builds where clearance is limited. Measure your mounting envelope first, then select the largest OD that fits comfortably.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich groove width should I choose — 6 mm or 8 mm?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect the groove width that matches or slightly exceeds your rope or cable diameter. A 6 mm groove suits cords and cables up to approximately 5–6 mm in diameter; an 8 mm groove accommodates lines up to approximately 7–8 mm. Using a groove that is too narrow can cause the rope to ride on the groove edges rather than seat fully, increasing wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size do I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe bore must match your shaft or bolt diameter. Available sizes are 5, 6, 7, 8, 10, 12, and 15 mm. If you are using a standard metric bolt as an axle, select the bore that matches the bolt's nominal diameter. A snug fit prevents lateral wobble; if you need a looser fit for easy removal, size up by 1 mm and use a spacer or washer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum pulley under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e6061-series aluminum alloy offers a tensile strength of approximately 260–310 MPa and a yield strength of approximately 240–276 MPa, making it suitable for light-to-medium duty rope and cable drive applications. For heavy industrial loads or shock-load environments, consult the specific load rating of the bearing and verify that the aluminum body meets your safety factor requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley suitable for outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum's natural oxide layer provides baseline corrosion resistance adequate for dry indoor use and occasional light moisture exposure. For sustained outdoor or wet environments, consider applying a protective coating or selecting a stainless-steel alternative. The pre-installed bearing should be kept lubricated and protected from prolonged water ingress to maintain smooth operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley as a belt redirect or tensioner idler?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The U-groove profile and radial bearing make these pulleys effective as idler or redirect wheels for round-section belts and cords in light-duty drive systems, such as 3D printer axes, small CNC machines, and custom automation rigs. Ensure the belt or cord diameter is compatible with the selected groove width before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the bearing come pre-installed, or do I need to press it in myself?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe radial ball bearing is pre-installed at the factory. The pulley is ready to mount on your shaft or bolt straight out of the package — no pressing tools or additional assembly required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size (outer diameter × hole) and groove width above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"30mm x 5mm (Groove Width 6mm) \/ 1 Pcs","offer_id":52445263986962,"sku":"LRPPIDAILUN962x1","price":10.17,"currency_code":"USD","in_stock":true},{"title":"30mm x 6mm (Groove Width 6mm) \/ 1 Pcs","offer_id":52445264019730,"sku":"LRPPIDAILUN963x1","price":10.17,"currency_code":"USD","in_stock":true},{"title":"30mm x 7mm (Groove Width 6mm) \/ 1 Pcs","offer_id":52445264052498,"sku":"LRPPIDAILUN964x1","price":10.17,"currency_code":"USD","in_stock":true},{"title":"30mm x 8mm (Groove Width 6mm) \/ 1 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