{"product_id":"10-pack-mr63zz-mini-ball-bearings-3x6x2-5mm-bearing-steel","title":"10-Pack MR63ZZ Mini Ball Bearings 3×6×2.5mm Bearing Steel","description":"\u003ch2\u003e10-Pack MR63ZZ Mini Ball Bearings — 3×6×2.5mm Bearing Steel\u003c\/h2\u003e\n\u003cp\u003eKeep your precision machinery, RC models, 3D printers, and hobby projects spinning smoothly with these \u003cstrong\u003eMR63ZZ miniature ball bearings\u003c\/strong\u003e. Each bearing is crafted from high-grade bearing steel and features double metal shields (ZZ) to keep out dust and debris, ensuring long-lasting, low-friction performance in compact applications.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e MR63ZZ\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Bearing Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Silver\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 6mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Diameter (Bore):\u003c\/strong\u003e 3mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness \/ Width:\u003c\/strong\u003e 2.5mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShield Type:\u003c\/strong\u003e Double Metal Shield (ZZ)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e 10 pieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose These Mini Bearings?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Compact Design:\u003c\/strong\u003e At just 6mm OD and 3mm bore, these bearings fit in the tightest spaces where standard bearings simply won't.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Grade Bearing Steel:\u003c\/strong\u003e Provides excellent hardness, wear resistance, and consistent rolling performance over extended use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble Metal Shields (ZZ):\u003c\/strong\u003e Protect internal raceways and balls from contamination, reducing maintenance frequency.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Friction Rolling:\u003c\/strong\u003e Smooth, quiet rotation ideal for high-speed and precision applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Use:\u003c\/strong\u003e Suitable for 3D printers, RC cars, drones, robotics, fishing reels, medical instruments, hobby motors, and miniature machinery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValue Pack:\u003c\/strong\u003e 10 bearings per pack — great for projects requiring multiple replacements or spares.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e3D printer axes and extruder mechanisms\u003c\/li\u003e\n  \u003cli\u003eRC cars, trucks, and drones\u003c\/li\u003e\n  \u003cli\u003eRobotics and servo mechanisms\u003c\/li\u003e\n  \u003cli\u003eFishing reels and small motors\u003c\/li\u003e\n  \u003cli\u003eHobby and DIY precision projects\u003c\/li\u003e\n  \u003cli\u003eMiniature machinery and equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10 × MR63ZZ Mini Ball Bearings (3×6×2.5mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/25-in-1-precision-magnetic-screwdriver-set-pro-repair-tool-kit\"\u003e25-in-1 Precision Magnetic Screwdriver Set | Pro Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/34-compartment-double-sided-hardware-storage-box-removable-dividers\"\u003e34-Compartment Double-Sided Hardware Storage Box \u0026amp; Dividers\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/waterproof-cable-gland-set-pg7-pg9-nylon-connectors-10-pack\"\u003e10-Pack Waterproof Cable Glands PG7 PG9 Nylon Connectors\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does \"ZZ\" mean in MR63ZZ ball bearings?\u003c\/h4\u003e\n\u003cp\u003eA: The \"ZZ\" designation indicates that the bearing has \u003cstrong\u003edouble metal shields\u003c\/strong\u003e on both sides. These shields protect the internal rolling elements and raceways from dust, debris, and minor splashing, helping to extend the bearing's service life with minimal maintenance.\u003c\/p\u003e\n\u003ch4\u003eQ: What applications are MR63ZZ mini ball bearings suitable for?\u003c\/h4\u003e\n\u003cp\u003eA: MR63ZZ bearings (3×6×2.5mm) are ideal for \u003cstrong\u003e3D printers, RC vehicles, drones, small motors, robotics, fishing reels, hobby projects\u003c\/strong\u003e, and any compact mechanical assembly requiring a 3mm bore and 6mm outer diameter bearing. Their small size makes them perfect for space-constrained precision equipment.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these bearings pre-lubricated?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, MR63ZZ bearings are typically pre-greased at the factory for smooth out-of-the-box performance. The double metal shields help retain lubrication inside the bearing, ensuring consistent rolling action throughout their service life.\u003c\/p\u003e\n\u003ch4\u003eQ: How many bearings are included in this pack?\u003c\/h4\u003e\n\u003cp\u003eA: Each pack contains \u003cstrong\u003e10 MR63ZZ mini ball bearings\u003c\/strong\u003e, giving you plenty of spares for multi-axis builds, replacements, or bulk hobby and repair projects.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does \\\"ZZ\\\" mean in MR63ZZ ball bearings?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The \\\"ZZ\\\" designation indicates that the bearing has double metal shields on both sides. These shields protect the internal rolling elements and raceways from dust, debris, and minor splashing, helping to extend the bearing's service life with minimal maintenance.\"}}, {\"@type\": \"Question\", \"name\": \"What applications are MR63ZZ mini ball bearings suitable for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"MR63ZZ bearings (3×6×2.5mm) are ideal for 3D printers, RC vehicles, drones, small motors, robotics, fishing reels, hobby projects, and any compact mechanical assembly requiring a 3mm bore and 6mm outer diameter bearing. Their small size makes them perfect for space-constrained precision equipment.\"}}, {\"@type\": \"Question\", \"name\": \"Are these bearings pre-lubricated?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, MR63ZZ bearings are typically pre-greased at the factory for smooth out-of-the-box performance. 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