{"product_id":"u-type-deep-groove-pulley-nylon-604zz-bearing-4x15x6mm","title":"U Type Deep Groove Pulley Ball Nylon Plastic Embedded 604ZZ Bearing  4x15x6mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eU-Type Deep Groove Nylon Pulley with 604ZZ Bearing — Smooth, Quiet Rolling for DIY Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your linear rail, rope guide, or belt tensioner keeps slipping, binding, or generating unwanted noise, the culprit is almost always a poorly fitted pulley. Makers, workshop builders, and automation hobbyists who need a compact, low-friction guide wheel will find this U-type deep groove pulley a reliable drop-in solution.\u003c\/p\u003e\n\u003cp\u003eEach pulley is molded from engineering-grade nylon with a pre-installed 604ZZ deep groove ball bearing at its core. The overall dimensions are 4 mm bore × 15 mm outer diameter × 6 mm width (approximately 0.16\" × 0.59\" × 0.24\"). The U-shaped groove profile is sized to capture round cords, thin belts, or wire rope securely without lateral drift.\u003c\/p\u003e\n\u003cp\u003eTypical applications include 3D printer filament guides, CNC wire-routing pulleys, sliding door rope guides, small conveyor tensioners, and DIY robotic arm cable management — anywhere a compact, embedded-bearing guide wheel is needed.\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 M4 shoulder bolts or 4 mm axle pins. U-groove suits round cords and thin ropes typically 2–4 mm in diameter. Verify groove width against your cord diameter before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These U-Type Nylon Groove Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003ePre-Installed 604ZZ Ball Bearing\u003c\/strong\u003e\n\u003cp\u003eThe deep groove ball bearing is factory-pressed into the nylon hub, delivering smooth, low-friction rotation right out of the package — no assembly required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧱\u003c\/span\u003e\n\u003cstrong\u003eEngineering-Grade Nylon Body\u003c\/strong\u003e\n\u003cp\u003eThe nylon shell is lightweight yet rigid, resisting deformation under moderate radial loads while keeping overall pulley weight minimal for fast-moving applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌊\u003c\/span\u003e\n\u003cstrong\u003eU-Groove Profile for Secure Cord Tracking\u003c\/strong\u003e\n\u003cp\u003eThe machined U-channel keeps round cords, ropes, and thin cables centered on the pulley face, preventing lateral slippage during direction changes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e\n\u003cstrong\u003eQuiet, Vibration-Damping Operation\u003c\/strong\u003e\n\u003cp\u003eNylon absorbs minor vibrations that metal pulleys transmit, resulting in noticeably quieter operation in enclosed frames and desktop automation rigs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n\u003cstrong\u003eCorrosion-Resistant Construction\u003c\/strong\u003e\n\u003cp\u003eThe nylon outer shell does not rust, and the 604ZZ bearing's steel races are shielded on both sides, making this pulley suitable for moderately humid workshop environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1 pc, 4 pcs, or 10 pcs to match your project scale — order a single unit for prototyping or a 10-pack for full machine builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — U-Type Nylon Groove Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Model\u003c\/th\u003e\n\u003ctd\u003e604ZZ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm (0.157\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e15 mm (0.591\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003e6 mm (0.236\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Profile\u003c\/th\u003e\n\u003ctd\u003eU-type deep groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Material\u003c\/th\u003e\n\u003ctd\u003eEngineering-grade nylon (PA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eDeep groove ball bearing, double-shielded (ZZ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Axle\u003c\/th\u003e\n\u003ctd\u003eM4 bolt \/ 4 mm pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuitable Cord Diameter\u003c\/th\u003e\n\u003ctd\u003eTypically 2–4 mm (contact us to confirm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Radial Load\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor \/ Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pc \/ 4 pcs \/ 10 pcs\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\u003cdetails\u003e\n\u003csummary\u003eWhat cord or rope diameter fits this U-groove pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe U-groove is designed for round cords and ropes typically in the 2–4 mm diameter range. For best tracking, the cord should sit snugly in the groove without excessive play. If you are using a specific cord size, contact us to confirm fitment before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat axle or bolt size does this pulley require?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 604ZZ bearing has a 4 mm bore, so this pulley mounts on an M4 shoulder bolt or any 4 mm diameter pin or axle. Ensure the axle is long enough to pass through your mounting bracket plus the 6 mm pulley width.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the 604ZZ bearing replaceable if it wears out?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe bearing is press-fit into the nylon hub. While a skilled user with the right press tools can replace it, in practice the low unit cost makes replacing the entire pulley more practical for most DIY applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this pulley handle outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe nylon body does not corrode, and the double-shielded (ZZ) bearing provides basic protection against dust and light moisture. For prolonged outdoor exposure or wet conditions, we recommend periodic inspection of the bearing and re-lubrication as needed.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow much load can this pulley carry?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis pulley is designed for light-duty DIY and automation applications — such as 3D printer guides, small cable routing, and hobby robotics. It is not rated for heavy industrial loads. For specific load requirements, please contact us to confirm suitability.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I order 1 pc, 4 pcs, or 10 pcs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eChoose 1 pc for prototyping or a single replacement. The 4-pack suits small builds with a few guide points. The 10-pack offers the best per-unit value for full machine builds, conveyor systems, or when you want spares on hand.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this compatible with 3D printer frames and CNC machines?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the 4 mm bore and compact 15 mm OD make this pulley a common choice for 3D printer filament guides, CNC wire routing, and similar maker projects. Verify that your frame's axle diameter is 4 mm and that the groove width suits your cord or cable.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your 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\": \"What cord or rope diameter fits this U-groove pulley?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The U-groove is designed for round cords and ropes typically in the 2–4 mm diameter range. For best tracking, the cord should sit snugly in the groove without excessive play. Contact us to confirm fitment for specific cord sizes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What axle or bolt size does this pulley require?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 604ZZ bearing has a 4 mm bore, so this pulley mounts on an M4 shoulder bolt or any 4 mm diameter pin or axle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the 604ZZ bearing replaceable if it wears out?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The bearing is press-fit into the nylon hub. While replacement is possible with press tools, the low unit cost makes replacing the entire pulley more practical for most DIY applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this pulley handle outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The nylon body does not corrode, and the double-shielded (ZZ) bearing provides basic protection against dust and light moisture. Periodic inspection and re-lubrication are recommended for prolonged outdoor use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much load can this pulley carry?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This pulley is designed for light-duty DIY and automation applications such as 3D printer guides, small cable routing, and hobby robotics. It is not rated for heavy industrial loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I order 1 pc, 4 pcs, or 10 pcs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose 1 pc for prototyping or a single replacement. The 4-pack suits small builds. The 10-pack offers the best per-unit value for full machine builds or when you want spares on hand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this compatible with 3D printer frames and CNC machines?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — the 4 mm bore and compact 15 mm OD make this pulley a common choice for 3D printer filament guides, CNC wire routing, and similar maker projects. Verify your frame's axle diameter is 4 mm.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1Pcs","offer_id":52446435410194,"sku":"FXL42-0","price":1.84,"currency_code":"USD","in_stock":true},{"title":"4Pcs","offer_id":52446435442962,"sku":"FXL42-1","price":3.88,"currency_code":"USD","in_stock":true},{"title":"10Pcs","offer_id":52446435475730,"sku":"FXL42-2","price":9.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of4_ed7cb986-35a1-4610-960d-7fdacfa898e4.jpg?v=1784047055","url":"https:\/\/homediyer.com\/products\/u-type-deep-groove-pulley-nylon-604zz-bearing-4x15x6mm","provider":"HomeDIYer","version":"1.0","type":"link"}