{"product_id":"miniature-deep-groove-ball-bearing-618-628-series-1-9mm","title":"Miniature Deep Groove Ball Bearing Small Bearings 1\/2\/3\/4\/5\/6\/7\/8\/9mm Inner Dia.","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMiniature Deep Groove Ball Bearings — 618 \u0026amp; 628 Series, 1–9mm Bore for Precision Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a failed bearing brings a drone motor, RC car drivetrain, or precision instrument to a halt, finding the exact replacement in the right bore size matters. Engineers, hobbyists, and repair technicians working with compact rotating assemblies need miniature deep groove ball bearings that fit precisely and run quietly without adding bulk to tight spaces.\u003c\/p\u003e\n\u003cp\u003eThis listing covers two complementary series of miniature deep groove ball bearings: the \u003cstrong\u003e628 series\u003c\/strong\u003e (ZZ double-shielded, bore 2–9mm, OD 5–17mm, width 1.5–5mm) and the \u003cstrong\u003e618 series\u003c\/strong\u003e (open and ZZ shielded, bore 1–9mm, OD 3–17mm, width 1–4mm). Both series feature steel construction with precision-ground raceways. Available individually or in packs of 3, 5, or 10 pieces.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include \u003cstrong\u003eminiature DC motor shaft support\u003c\/strong\u003e in RC vehicles and drones, \u003cstrong\u003espindle bearings in 3D printer extruder assemblies\u003c\/strong\u003e, \u003cstrong\u003epivot points in precision measuring instruments\u003c\/strong\u003e, and \u003cstrong\u003esmall gearbox idler shafts\u003c\/strong\u003e in robotics. The ZZ shield variants reduce contamination ingress in dusty workshop environments, while open variants suit applications requiring lubrication access.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e These bearings follow standard ISO 618 and 628 dimensional series. Verify bore (d), outer diameter (D), and width (B) against your housing and shaft before ordering. Select your model from the variant dropdown — dimensions are listed as d×D×B in mm.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Miniature Deep Groove Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eTwo Series, One Listing\u003c\/strong\u003e\u003cbr\u003e628 series (2–9mm bore) and 618 series (1–9mm bore) available in a single place — simplifies sourcing when you need both series for a multi-axis assembly.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eZZ Double-Shield Option\u003c\/strong\u003e\u003cbr\u003eSelected models carry ZZ steel shields on both sides, blocking particulate ingress and retaining factory grease — suited for dusty or semi-enclosed environments.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eISO-Standard Dimensions\u003c\/strong\u003e\u003cbr\u003eBore, outer diameter, and width conform to ISO 618\/628 series tolerances, ensuring drop-in compatibility with standard housings and shafts across the listed size range (1–9mm bore, 3–17mm OD).\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eLightweight \u0026amp; Compact Profile\u003c\/strong\u003e\u003cbr\u003eWidth ranges from 1mm (618\/1) to 5mm (628\/6 through 628\/9), keeping rotating mass minimal — critical for high-speed drone motors and micro-robotics joints.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\u003cbr\u003eOrder 1, 3, 5, or 10 pieces per variant — buy a single replacement or stock a service kit without committing to large minimum quantities.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eBroad Application Coverage\u003c\/strong\u003e\u003cbr\u003eSuitable for RC vehicles, 3D printers, drones, precision instruments, small motors, and hobby robotics — one product family covers a wide range of miniature rotating assemblies.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Miniature Deep Groove Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003e618 series (open \u0026amp; ZZ), 628 series (ZZ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (d)\u003c\/th\u003e\n\u003ctd\u003e1mm – 9mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e3mm – 17mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth (B)\u003c\/th\u003e\n\u003ctd\u003e1mm – 5mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShield Type\u003c\/th\u003e\n\u003ctd\u003eZZ (double steel shield) or Open — see variant name\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSteel (raceway \u0026amp; rolling elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensional Standard\u003c\/th\u003e\n\u003ctd\u003eISO 618 \/ ISO 628 series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1 pc, 3 pcs, 5 pcs, 10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication (ZZ models)\u003c\/th\u003e\n\u003ctd\u003eFactory-greased, sealed by steel shields\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication (Open models)\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRadial Load Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 between the 618 series and the 628 series?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe key difference is the width-to-bore ratio. The 628 series is slightly wider relative to its bore — for example, a 628\/6-ZZ measures 6×13×5mm, while a 618\/6-ZZ measures 6×13×3.5mm. If your housing depth is constrained, the 618 series offers a thinner profile at the same bore and OD. If you need more load capacity in the same bore size, the wider 628 series is the better choice. Always check the B (width) dimension against your housing depth before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"ZZ\" mean on these bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eZZ indicates that the bearing has steel shields pressed onto both sides of the outer ring. These shields reduce the entry of dust and debris into the raceway and help retain the factory-applied grease. ZZ bearings are not fully sealed — they are not rated for submersion — but they perform well in dry, dusty, or lightly contaminated environments. Open variants (no suffix) have no shields and allow direct lubrication access.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings compatible with standard housings and shafts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Both the 618 and 628 series follow ISO dimensional standards, so bore, outer diameter, and width match the published ISO tolerances for these series. This means they are dimensionally interchangeable with other ISO-compliant 618\/628 bearings of the same model number. Verify the three dimensions (d×D×B) listed in the variant name against your application before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in high-speed applications like drone motors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMiniature deep groove ball bearings in the 618 and 628 series are commonly used in brushless drone motors and high-speed spindles. The ZZ-shielded variants retain grease at elevated RPM and resist contamination from rotor wash. For specific speed ratings (limiting speed \/ reference speed), refer to the ISO 618\/628 series load tables for the exact model number, as these vary by bore size and bearing width.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the right quantity — 1, 3, 5, or 10 pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSingle pieces (1 pc) are suited for one-off repairs or prototyping. Packs of 3 or 5 are practical for small builds with multiple bearing positions — for example, a 3D printer with two Z-axis lead screw bearings and one extruder bearing. Packs of 10 offer the lowest per-unit cost and are recommended if you maintain a service stock or are building multiple units of the same design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these bearings require additional lubrication before installation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eZZ-shielded models come factory-greased and are ready to install without additional lubrication. Do not wash or re-lubricate ZZ bearings before installation, as this can displace the factory grease. Open variants (618\/1, 618\/2, 618\/3 — no ZZ suffix) should be lightly lubricated with a suitable bearing grease or oil appropriate for your operating speed and load before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the smallest bearing available in this listing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe smallest model is the \u003cstrong\u003e618\/1\u003c\/strong\u003e, with a 1mm bore, 3mm outer diameter, and 1mm width. This is one of the smallest standard deep groove ball bearings available and is used in micro-motors, precision instruments, and miniature robotics joints where shaft diameters are 1mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model (d×D×B) and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"628\/2-ZZ (2*5*1.5mm) \/ 1","offer_id":52410434978066,"sku":"LXDLIIIIU4905x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"628\/3-ZZ (3*7*2.5mm) \/ 1","offer_id":52410435010834,"sku":"LXDLIIIIU4906x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"628\/4-ZZ (4*9*3.5mm) \/ 1","offer_id":52410435043602,"sku":"LXDLIIIIU4907x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"628\/6-ZZ (6*13*5mm) \/ 1","offer_id":52410435076370,"sku":"LXDLIIIIU4908x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"628\/7-ZZ (7*14*5mm) \/ 1","offer_id":52410435109138,"sku":"LXDLIIIIU4909x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"628\/8-ZZ (8*16*5mm) \/ 1","offer_id":52410435141906,"sku":"LXDLIIIIU4910x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"628\/9-ZZ (9*17*5mm) \/ 1","offer_id":52410435174674,"sku":"LXDLIIIIU4911x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"618\/1 (1*3*1mm) \/ 1","offer_id":52410435207442,"sku":"LXDLIIIIU4912x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"618\/2 (2*5*1.5mm) \/ 1","offer_id":52410435240210,"sku":"LXDLIIIIU4913x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"618\/3 (3*7*2mm) \/ 1","offer_id":52410435272978,"sku":"LXDLIIIIU4914x1","price":7.33,"currency_code":"USD","in_stock":true},{"title":"618\/4-ZZ (4*9*2.5mm) \/ 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3","offer_id":52410435764498,"sku":"LXDLIIIIU4913x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"618\/3 (3*7*2mm) \/ 3","offer_id":52410435797266,"sku":"LXDLIIIIU4914x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"618\/4-ZZ (4*9*2.5mm) \/ 3","offer_id":52410435830034,"sku":"LXDLIIIIU4915x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"618\/5-ZZ (5*11*3mm) \/ 3","offer_id":52410435862802,"sku":"LXDLIIIIU4916x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"618\/6-ZZ (6*13*3.5mm) \/ 3","offer_id":52410435895570,"sku":"LXDLIIIIU4917x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"618\/7-ZZ (7*14*3.5mm) \/ 3","offer_id":52410435928338,"sku":"LXDLIIIIU4918x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"618\/8-ZZ (8*16*4mm) \/ 3","offer_id":52410435961106,"sku":"LXDLIIIIU4919x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"618\/9-ZZ (9*17*4mm) \/ 3","offer_id":52410435993874,"sku":"LXDLIIIIU4920x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"628\/2-ZZ (2*5*1.5mm) \/ 5","offer_id":52410436026642,"sku":"LXDLIIIIU4905x5","price":21.07,"currency_code":"USD","in_stock":true},{"title":"628\/3-ZZ (3*7*2.5mm) \/ 5","offer_id":52410436059410,"sku":"LXDLIIIIU4906x5","price":21.07,"currency_code":"USD","in_stock":true},{"title":"628\/4-ZZ (4*9*3.5mm) \/ 5","offer_id":52410436092178,"sku":"LXDLIIIIU4907x5","price":21.07,"currency_code":"USD","in_stock":true},{"title":"628\/6-ZZ (6*13*5mm) \/ 5","offer_id":52410436124946,"sku":"LXDLIIIIU4908x5","price":21.07,"currency_code":"USD","in_stock":true},{"title":"628\/7-ZZ (7*14*5mm) \/ 5","offer_id":52410436157714,"sku":"LXDLIIIIU4909x5","price":21.07,"currency_code":"USD","in_stock":true},{"title":"628\/8-ZZ (8*16*5mm) \/ 5","offer_id":52410436190482,"sku":"LXDLIIIIU4910x5","price":21.07,"currency_code":"USD","in_stock":true},{"title":"628\/9-ZZ (9*17*5mm) \/ 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