{"product_id":"u-groove-pom-pulley-roller-wheel-bearing","title":"Round U Groove Bearings Guide Plastic-coated Bearing POM Pulley Roller Wheel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eU Groove POM Pulley Roller Wheel — Smooth, Quiet Guidance for Linear Motion Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your linear rail, conveyor, or 3D printer carriage develops unwanted wobble or noise, the culprit is often a worn or mismatched guide wheel. Engineers, makers, and automation builders who need a reliable, low-friction rolling solution turn to U groove POM pulley roller wheels — a compact component that keeps motion smooth, precise, and repeatable without constant lubrication.\u003c\/p\u003e\n\u003cp\u003eEach U groove POM pulley roller wheel consists of a precision-molded POM (polyoxymethylene) outer shell with a machined U-shaped groove, fitted over a pre-installed deep-groove ball bearing. Inner diameter (ID) ranges from 3 mm to 15 mm (approx. 0.12″–0.59″), outer diameter (OD) from 14 mm to 59 mm (approx. 0.55″–2.32″), and width from 6 mm to 22 mm (approx. 0.24″–0.87″). Available in White, Black, Orange, Green, and Milky White. One variant (5×27×8) is supplied without a bearing for custom bearing installations.\u003c\/p\u003e\n\u003cp\u003eTypical applications include 3D printer X\/Y-axis carriage wheels riding on V-slot or T-slot aluminum extrusions, CNC router gantry guide rollers, lightweight conveyor lane guides, cable management pulleys, and DIY linear actuator assemblies where a quiet, self-lubricating rolling element is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard V-slot and T-slot aluminum extrusions, round rod rails, and custom guide tracks. Match the U groove width and OD to your rail profile. Select the correct ID for your axle bolt diameter.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These U Groove POM Pulley Roller Wheels\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔵\u003c\/div\u003e\n\u003cstrong\u003ePOM Outer Shell\u003c\/strong\u003e\n\u003cp\u003eMachined from engineering-grade POM for inherent self-lubrication, low friction, and resistance to wear — no grease required for standard duty cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003ePre-installed Ball Bearing\u003c\/strong\u003e\n\u003cp\u003eDeep-groove ball bearing is factory-pressed into the bore, delivering smooth rotation from the first use and consistent radial load capacity across the size range.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Size Selection\u003c\/strong\u003e\n\u003cp\u003eOver 35 ID×OD×Width combinations — from compact U3-14-7 to large U15-59-22 — covering the most common linear guide and conveyor roller dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎨\u003c\/div\u003e\n\u003cstrong\u003eMultiple Color Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in White, Black, Orange, Green, and Milky White, making it easy to color-code axes or match your machine's aesthetic without sacrificing function.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔇\u003c\/div\u003e\n\u003cstrong\u003eLow-Noise Operation\u003c\/strong\u003e\n\u003cp\u003eThe POM-to-rail contact and sealed bearing combine to minimize vibration and operating noise — ideal for desktop CNC machines and 3D printers in shared workspaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1, 2, 3, or 5 pieces per SKU to match your exact build quantity — no need to over-buy or wait for a second shipment to complete your project.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — U Groove POM Pulley Roller Wheel\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eU Groove Guide Pulley Roller Wheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShell Material\u003c\/th\u003e\n\u003ctd\u003ePOM (Polyoxymethylene \/ Acetal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eDeep-groove ball bearing (pre-installed; one variant bearing-free)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e3 mm – 15 mm (0.12″ – 0.59″) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e14 mm – 59 mm (0.55″ – 2.32″) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003e6 mm – 22 mm (0.24″ – 0.87″) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Profile\u003c\/th\u003e\n\u003ctd\u003eU-shaped (round-bottom groove)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Colors\u003c\/th\u003e\n\u003ctd\u003eWhite, Black, Orange, Green, Milky White\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 pcs — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSmooth molded POM, no coating required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically –40 °C to +100 °C (–40 °F to +212 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eSelf-lubricating (POM); bearing pre-greased\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003ePOM shell: resistant to moisture and mild chemicals; bearing: contact us to confirm sealing grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right size U groove pulley roller wheel?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the Inner Diameter (ID) to your axle bolt or shaft diameter, the Outer Diameter (OD) to the space available in your assembly, and the Width to your rail or groove width. The variant label format is ID×OD×Width in millimeters — for example, U6-30-10 means ID 6 mm, OD 30 mm, Width 10 mm. If you are fitting the wheel onto a V-slot extrusion, the OD and groove angle must match the extrusion profile.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is POM and why is it used for pulley roller wheels?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePOM (polyoxymethylene, also called acetal or Delrin®) is an engineering thermoplastic known for its high stiffness, low friction coefficient, and excellent dimensional stability. In pulley roller wheels, POM provides a self-lubricating rolling surface that reduces wear on both the wheel and the rail, operates quietly, and does not require external grease — making it well-suited for 3D printers, CNC machines, and light conveyor systems.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these wheels compatible with V-slot aluminum extrusions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMany sizes in this range are designed to ride in the V-slot channel of standard 2020, 2040, and similar aluminum extrusion profiles. Verify that the OD and groove width of the wheel match your specific extrusion slot dimensions before ordering. The U groove profile is a round-bottom groove; if your extrusion uses a sharp V-angle, confirm compatibility with your rail supplier's specifications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can these pulley roller wheels handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity depends on the bearing size embedded in each wheel variant. Larger OD wheels contain larger bearings with higher radial load ratings. These wheels are suited for light-to-medium duty applications such as 3D printer carriages, small CNC gantries, and cable guide pulleys. For heavy industrial conveyor loads, contact us to confirm the specific bearing specification for your chosen size.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs the bearing sealed or shielded, and does it need lubrication?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pre-installed bearings are typically supplied with metal shields or rubber seals and come pre-greased from the factory. The POM outer shell is inherently self-lubricating, so no additional grease is needed on the rolling surface under normal operating conditions. For high-speed or high-temperature environments, contact us to confirm the bearing seal type for your selected variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the \"No bearing\" variant (5×27×8) mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 5×27×8 (No bearing) variant is a plain POM roller shell without a pre-installed bearing. This is intended for builders who want to press in their own specific bearing — for example, a stainless steel or ceramic bearing for a specialized environment — or who need a lightweight idler without a rolling element. The bore is sized to accept a standard bearing with the matching outer diameter.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these wheels outdoors or in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe POM shell has good moisture resistance and will not rust or corrode. However, the pre-installed steel bearing may be susceptible to corrosion in prolonged wet or salt-spray environments. For outdoor or high-humidity applications, consider applying a light bearing grease or contact us to confirm whether a stainless-steel bearing variant is available for your required size.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces should I order for a typical 3D printer or CNC build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMost CoreXY and Cartesian 3D printer designs use between 4 and 9 idler\/guide wheels depending on the axis configuration. A typical two-axis CNC router gantry may use 6–12 wheels. We offer 1, 2, 3, and 5-piece packs so you can order exactly what your BOM requires. For larger batch builds, ordering the 5-piece pack typically offers the best per-unit value.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your ID×OD×Width size, color, and quantity above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right size U groove pulley roller wheel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the Inner Diameter (ID) to your axle bolt or shaft diameter, the Outer Diameter (OD) to the space available in your assembly, and the Width to your rail or groove width. The variant label format is ID×OD×Width in millimeters.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is POM and why is it used for pulley roller wheels?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"POM (polyoxymethylene) is an engineering thermoplastic with high stiffness, low friction, and excellent dimensional stability. It provides a self-lubricating rolling surface that reduces wear and operates quietly without external grease.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these wheels compatible with V-slot aluminum extrusions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Many sizes are designed to ride in the V-slot channel of standard 2020, 2040, and similar aluminum extrusion profiles. Verify that the OD and groove width match your specific extrusion slot dimensions before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load capacity can these pulley roller wheels handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity depends on the bearing size in each variant. These wheels are suited for light-to-medium duty applications such as 3D printer carriages, small CNC gantries, and cable guide pulleys.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the bearing sealed or shielded, and does it need lubrication?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pre-installed bearings are typically supplied with metal shields or rubber seals and come pre-greased. The POM outer shell is self-lubricating, so no additional grease is needed on the rolling surface under normal conditions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the 'No bearing' variant (5×27×8) mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 5×27×8 (No bearing) variant is a plain POM roller shell without a pre-installed bearing, intended for builders who want to press in their own specific bearing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these wheels outdoors or in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The POM shell has good moisture resistance and will not rust. However, the pre-installed steel bearing may be susceptible to corrosion in prolonged wet environments. Consider applying bearing grease or contact us for stainless-steel bearing options.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for a typical 3D printer or CNC build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Most CoreXY and Cartesian 3D printer designs use 4–9 idler\/guide wheels. A typical two-axis CNC router gantry may use 6–12 wheels. We offer 1, 2, 3, and 5-piece packs so you can order exactly what your build requires.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"U3-14-7 \/ White \/ 1 pcs","offer_id":52446277665042,"sku":"KEYLADGZCWJ3795x1","price":2.38,"currency_code":"USD","in_stock":true},{"title":"U4-15-6 \/ White \/ 1 pcs","offer_id":52446277697810,"sku":"KEYLADGZCWJ3796x1","price":2.38,"currency_code":"USD","in_stock":true},{"title":"U4-18-6 \/ White \/ 1 pcs","offer_id":52446277730578,"sku":"KEYLADGZCWJ3797x1","price":2.38,"currency_code":"USD","in_stock":true},{"title":"U5-20-7 \/ Black \/ 1 pcs","offer_id":52446277763346,"sku":"KEYLADGZCWJ3799x1","price":2.38,"currency_code":"USD","in_stock":true},{"title":"U5-22-6 \/ White \/ 1 pcs","offer_id":52446277796114,"sku":"KEYLADGZCWJ3800x1","price":13.53,"currency_code":"USD","in_stock":true},{"title":"U5-24-7 \/ White \/ 1 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