{"product_id":"u-grooved-idler-pulley-pu-belt-6-8-10mm-aluminum-od-30-80mm","title":"U-Grooved Idler Pulley For Width 6\/8\/10mm PU Belt Pulleys Aluminum OD 30mm-80mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eU-Grooved Idler Pulley for PU Belt — Precise Belt Guidance for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen belt slippage or misalignment stalls your build, the culprit is often an undersized or poorly machined idler pulley. Engineers, robotics builders, and CNC hobbyists who demand repeatable motion need a U-grooved idler pulley that holds belt tracking without flex or wobble — every cycle, every time.\u003c\/p\u003e\n\u003cp\u003eThese U-grooved idler pulleys are machined from aluminum alloy and feature a precisely cut U-profile groove designed to guide flat PU belts with widths of 6mm, 8mm, or 10mm. Outer diameters range from 30mm to 80mm (~1.18\" to ~3.15\"), with bore options from 5mm to 20mm (~0.20\" to ~0.79\") to suit a wide range of shaft sizes. Each pulley ships individually (1 piece per order) unless a multi-pack variant is selected.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: tensioning and redirecting PU flat belts in desktop CNC routers and laser cutters; serving as idler wheels in 3D printer belt drive systems; and guiding conveyor belts in lightweight automation and pick-and-place rigs where low-friction, low-inertia pulleys reduce motor load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatible with:\u003c\/strong\u003e 6mm, 8mm, and 10mm width PU flat belts \u0026amp; open-ended timing belts. Bore sizes 5–20mm fit standard metric shafts. Verify your belt width and shaft diameter before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These U-Grooved Idler 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 yet rigid machined aluminum body keeps rotational inertia low while maintaining dimensional stability under continuous belt load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003ePrecision U-Profile Groove\u003c\/strong\u003e — The U-shaped groove is machined to match 6mm, 8mm, or 10mm PU belt widths, providing positive lateral belt containment and reducing edge wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide OD Range: 30mm–80mm\u003c\/strong\u003e — Four outer diameter options (30 \/ 40 \/ 60 \/ 80mm) let you match the correct wrap angle and belt speed ratio for your specific drive geometry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes: 5–20mm\u003c\/strong\u003e — Bore options from 5mm to 20mm accommodate a broad range of metric shafts and shoulder bolts, eliminating the need for custom bushings in most builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eIdler \/ Tensioner Ready\u003c\/strong\u003e — Designed for free-spinning idler and tensioner applications; mount on a fixed shaft or adjustable tensioner bracket to maintain consistent belt tension throughout the drive path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eDrop-In Fit for Common Platforms\u003c\/strong\u003e — Standard metric bore sizing and flat-face hub geometry make these pulleys straightforward to integrate into OpenBuilds, V-slot, and custom aluminum extrusion frames.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — U-Grooved Idler 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 Profile\u003c\/th\u003e\n\u003ctd\u003eU-Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e6mm \/ 8mm \/ 10mm\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 \/ 6mm \/ 7mm \/ 8mm \/ 10mm \/ 12mm \/ 14mm \/ 15mm \/ 16mm \/ 18mm \/ 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Thickness\u003c\/th\u003e\n\u003ctd\u003eSee 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\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eIdler \/ Tensioner for PU flat belt drives\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 OD for my belt drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe outer diameter affects the wrap angle and the surface speed of the belt at the idler. For tensioner applications, a smaller OD (30–40mm) is typically sufficient. For redirecting pulleys where the belt wraps more than 90°, a larger OD (60–80mm) reduces bending stress on the belt and extends belt life. Match the OD to your available mounting space and desired belt path geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect a bore diameter that matches your shaft or shoulder bolt diameter exactly. Available bores range from 5mm to 20mm. If you are using a standard M5 shoulder bolt, choose the 5mm bore; for an M8 shaft, choose 8mm, and so on. A precise bore-to-shaft fit prevents radial play that would cause belt tracking issues.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys suitable for high-speed or continuous-duty applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese aluminum idler pulleys are well-suited for the moderate speeds typical of desktop CNC, 3D printers, and light automation. For continuous high-speed or heavy-load industrial duty cycles, verify that the bore fit and any bearing arrangement you use are rated for your RPM and radial load. Contact us to confirm suitability for demanding applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these pulleys include a bearing, or do they mount directly on a shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are supplied as the aluminum pulley body only. They are designed to be mounted on a shaft with an appropriate bearing (such as a flanged or standard radial ball bearing pressed into the bore) or used directly on a shoulder bolt with a smooth bore fit. Please confirm your mounting method and select the matching bore size accordingly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these pulleys work with timing belts as well as flat PU belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe U-groove profile is optimized for flat PU belts and open-ended flat belts of 6mm, 8mm, or 10mm width. They can also function as smooth idlers for the back side of toothed timing belts (where the flat back of the belt contacts the pulley). They are not designed to mesh with the tooth profile of a timing belt on the toothed face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the groove width matches my belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe groove width is matched to the belt width variant you select (6mm, 8mm, or 10mm). Measure your belt width with calipers and select the corresponding groove width option. A groove that is too wide allows lateral belt wander; a groove that is too narrow can pinch the belt edges and cause premature wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs aluminum suitable for my application, or should I look for a steel pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum is an excellent choice for most maker, robotics, and light CNC applications because it offers a favorable strength-to-weight ratio and resists corrosion in typical indoor environments. If your application involves heavy radial loads, abrasive environments, or elevated temperatures beyond what aluminum alloy handles reliably, a steel pulley may be more appropriate. For standard desktop CNC and 3D printer use, aluminum is the practical choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your OD, Groove Width, 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 \/ 6mm \/ 5mm \u0026 1Pcs","offer_id":52445419634962,"sku":"FXLGB808-0","price":6.92,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 6mm \/ 6mm \u0026 1Pcs","offer_id":52445419667730,"sku":"FXLGB808-1","price":6.92,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 6mm \/ 7mm \u0026 1Pcs","offer_id":52445419700498,"sku":"FXLGB808-2","price":6.92,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 6mm \/ 8mm \u0026 1Pcs","offer_id":52445419733266,"sku":"FXLGB808-3","price":6.92,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 6mm \/ 10mm \u0026 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