{"product_id":"695zz-nylon-grooved-wheel-pulley-rail-roller-5x21x9mm","title":"Nylon Bearing Roller H Type Grooved Wheel Pulleys Rail Wheel 695ZZ 5x21x9 mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e695ZZ Nylon Grooved Wheel Pulley — Smooth, Quiet Rail Roller for DIY Linear Motion\u003c\/h2\u003e\n\u003cp\u003eWhen your linear motion system rattles, binds, or wears out prematurely, the culprit is often a low-grade roller that can't handle the load. Makers, hobbyists, and small-workshop builders who need reliable, low-noise travel along V-slot or round rails will find the 695ZZ nylon bearing roller to be a dependable upgrade that keeps projects running smoothly.\u003c\/p\u003e\n\u003cp\u003eEach roller is built around a 695ZZ ball bearing pressed into a POM (polyoxymethylene) nylon wheel body. The H-type grooved profile is machined to ride cleanly on standard round rails and rod guides. The bearing bore measures 5 mm (0.197 in), the outer diameter is 21 mm (0.827 in), and the wheel height is 9 mm (0.354 in), making it a direct fit for many common 695-series bearing applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY CNC gantry carriages, 3D printer axis rollers, sliding door guides, and lightweight conveyor rail systems — anywhere a compact, self-lubricating grooved wheel is needed for smooth linear travel.\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 695ZZ bearing seats (5 mm bore). Designed for round rod rails and compatible V-groove track profiles. Verify your rail diameter and groove angle before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 695ZZ Nylon Grooved Wheel Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003e695ZZ Ball Bearing Core\u003c\/strong\u003e\n\u003cp\u003ePre-installed 695ZZ shielded ball bearing provides smooth, low-friction rotation and handles both radial and light axial loads without additional lubrication.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\n\u003cstrong\u003ePOM Nylon Wheel Body\u003c\/strong\u003e\n\u003cp\u003eThe polyoxymethylene (POM) outer wheel is self-lubricating, resistant to wear, and operates quietly — reducing vibration and noise compared to metal rollers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eH-Type Grooved Profile\u003c\/strong\u003e\n\u003cp\u003eThe H-groove geometry centers the roller on round rod rails, preventing lateral drift and maintaining consistent tracking across the full travel range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n\u003cstrong\u003eCompact 5 × 21 × 9 mm Dimensions\u003c\/strong\u003e\n\u003cp\u003eA small footprint (5 mm bore \/ 21 mm OD \/ 9 mm height) makes this roller easy to integrate into tight carriage designs without adding bulk.\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\u003ePOM is inherently resistant to moisture and mild chemicals, and the shielded bearing reduces contamination ingress — suitable for light-duty indoor automation 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, 2, 5, and 10-piece packs so you can order exactly what your build requires — from a single replacement to a full carriage set.\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 — 695ZZ Nylon Grooved Wheel Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003e695ZZ Shielded Ball Bearing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWheel Material\u003c\/th\u003e\n\u003ctd\u003ePOM (Polyoxymethylene) Nylon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWheel Profile\u003c\/th\u003e\n\u003ctd\u003eH-Type Grooved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (Inner)\u003c\/th\u003e\n\u003ctd\u003e5 mm (0.197 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e21 mm (0.827 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWheel Height\u003c\/th\u003e\n\u003ctd\u003e9 mm (0.354 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Rail Type\u003c\/th\u003e\n\u003ctd\u003eRound rod rail \/ compatible V-groove track\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\u003ePack Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural POM (off-white \/ light grey)\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 rail size does this grooved wheel fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis roller is designed for round rod rails that seat into the H-type groove profile. The 695ZZ bearing has a 5 mm bore, so the mounting shaft or axle must be 5 mm in diameter. Always verify your rail diameter and groove angle match before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs POM strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePOM (polyoxymethylene) is a rigid engineering thermoplastic with good compressive strength and stiffness. It performs well in light-to-medium duty linear motion applications such as 3D printer axes, CNC gantries, and sliding guides. For heavy industrial loads or high-impact environments, a metal-bodied roller would be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this roller resist corrosion and moisture?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. POM has inherent resistance to moisture, oils, and mild chemicals, making it suitable for indoor automation and light workshop use. The 695ZZ bearing is double-shielded to reduce contamination ingress. It is not rated for submersion or harsh chemical exposure.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this compatible with V-slot aluminum extrusion profiles?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis roller features an H-type groove designed primarily for round rod rails. Compatibility with V-slot extrusion depends on the groove angle and rail geometry of your specific profile. We recommend confirming the groove dimensions match your extrusion before purchasing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces do I need for a typical carriage?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA standard linear carriage typically uses 3–6 rollers depending on the design (e.g., 3-point or 4-point contact). Select the 5-piece or 10-piece pack if you are building a full carriage or want spares on hand. The 1-piece and 2-piece options are ideal for replacements or prototyping.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the 695ZZ bearing need additional lubrication?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 695ZZ bearing comes pre-greased from the factory and the shielded design retains lubrication during normal use. The POM wheel body is also self-lubricating. Under typical light-duty conditions, no additional lubrication is required. In high-cycle or dusty environments, periodic inspection is recommended.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these rollers in a 3D printer or CNC router build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — 695ZZ grooved wheel rollers are commonly used in DIY 3D printer axis assemblies and lightweight CNC gantry carriages where a compact, low-noise roller is needed. Confirm that your carriage design accommodates a 5 mm axle and 21 mm outer diameter before finalizing your build.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Material, Size, and Amount 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 rail size does this grooved wheel fit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This roller is designed for round rod rails that seat into the H-type groove profile. The 695ZZ bearing has a 5 mm bore, so the mounting shaft or axle must be 5 mm in diameter. Always verify your rail diameter and groove angle match before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is POM strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"POM (polyoxymethylene) is a rigid engineering thermoplastic with good compressive strength and stiffness. It performs well in light-to-medium duty linear motion applications such as 3D printer axes, CNC gantries, and sliding guides. For heavy industrial loads or high-impact environments, a metal-bodied roller would be more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does this roller resist corrosion and moisture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. POM has inherent resistance to moisture, oils, and mild chemicals, making it suitable for indoor automation and light workshop use. The 695ZZ bearing is double-shielded to reduce contamination ingress. It is not rated for submersion or harsh chemical exposure.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this compatible with V-slot aluminum extrusion profiles?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This roller features an H-type groove designed primarily for round rod rails. Compatibility with V-slot extrusion depends on the groove angle and rail geometry of your specific profile. We recommend confirming the groove dimensions match your extrusion before purchasing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces do I need for a typical carriage?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A standard linear carriage typically uses 3–6 rollers depending on the design. Select the 5-piece or 10-piece pack if you are building a full carriage or want spares on hand. The 1-piece and 2-piece options are ideal for replacements or prototyping.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the 695ZZ bearing need additional lubrication?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 695ZZ bearing comes pre-greased and the shielded design retains lubrication during normal use. The POM wheel body is also self-lubricating. Under typical light-duty conditions, no additional lubrication is required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these rollers in a 3D printer or CNC router build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — 695ZZ grooved wheel rollers are commonly used in DIY 3D printer axis assemblies and lightweight CNC gantry carriages. Confirm that your carriage design accommodates a 5 mm axle and 21 mm outer diameter before finalizing your build.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"POM \/ 5 x 21 x 9 mm \/ 1 PCS","offer_id":52446690640146,"sku":"GYJLTBJT02182x1","price":35.35,"currency_code":"USD","in_stock":true},{"title":"POM \/ 5 x 21 x 9 mm \/ 2 PCS","offer_id":52446690672914,"sku":"GYJLTBJT02182x2","price":81.4,"currency_code":"USD","in_stock":true},{"title":"POM \/ 5 x 21 x 9 mm \/ 5 PCS","offer_id":52446690705682,"sku":"GYJLTBJT02182x5","price":200.12,"currency_code":"USD","in_stock":true},{"title":"POM \/ 5 x 21 x 9 mm \/ 10 PCS","offer_id":52446690738450,"sku":"GYJLTBJT02182x10","price":398.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_d9bc077a-308c-4134-b6b8-5bdef74c9f7f.jpg?v=1784085712","url":"https:\/\/homediyer.com\/products\/695zz-nylon-grooved-wheel-pulley-rail-roller-5x21x9mm","provider":"HomeDIYer","version":"1.0","type":"link"}