{"product_id":"4pcs-deep-groove-ball-bearings-603-699zz","title":"4PCS Deep Groove Ball Bearings ID 2 - 9mm OD 5-30mm Thick 2.5-10mm 603 to 699ZZ","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eDeep Groove Ball Bearings 603–699ZZ — Precision Miniature Bearings for Tight Spaces\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized bearing causes wobble, noise, or premature failure in your build, finding the exact replacement size quickly is what matters most. Hobbyists, makers, and mechanical repair technicians who work with compact rotating assemblies need a reliable source for miniature deep groove ball bearings across a wide size range — without ordering from multiple suppliers.\u003c\/p\u003e\n\u003cp\u003eEach pack contains 4 identical deep groove ball bearings with double-steel shields (ZZ or ZRS designation). Inner diameters span 2–9 mm (approx. 0.08–0.35 in), outer diameters 5–30 mm (approx. 0.20–1.18 in), and widths 2.5–10 mm (approx. 0.10–0.39 in), covering 43 standard models from 603ZZ through 699ZZ. Rings and rolling elements are steel; the ZZ shield keeps grease in and light contaminants out without adding significant drag.\u003c\/p\u003e\n\u003cp\u003eThese deep groove ball bearings are well-suited for RC car wheel hubs and motor shafts, 3D printer extruder and axis carriages, inline skate and skateboard wheels, small power-tool spindles, and DIY robotics joint pivots — anywhere a compact, low-friction radial bearing is required.\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:\u003c\/strong\u003e Select your model number above to confirm ID × OD × width dimensions before ordering. ZZ = double steel shield; ZRS = steel shield + rubber seal on one side.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Deep Groove Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e43 Sizes in One Listing\u003c\/strong\u003e — Models 603ZZ through 699ZZ; ID 2–9 mm, OD 5–30 mm, width 2.5–10 mm. Choose the exact dimension from the variant selector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Piece Pack per Order\u003c\/strong\u003e — Each purchase ships 4 identical bearings, giving you spares for maintenance or symmetrical multi-bearing assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-Steel ZZ Shielding\u003c\/strong\u003e — Non-contact shields retain factory grease and block dust ingress, reducing re-lubrication frequency in light-duty applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel Rings \u0026amp; Rolling Elements\u003c\/strong\u003e — Hardened steel races and balls deliver consistent radial load capacity across the full miniature size range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Rotational Drag\u003c\/strong\u003e — Open-race geometry and pre-applied grease allow smooth, low-torque spin — critical for RC motors, printer carriages, and small spindles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Application Range\u003c\/strong\u003e — Fits RC vehicles, 3D printers, inline skates, robotics joints, small power tools, and general mechanical repair where standard miniature bearing sizes are specified.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Deep Groove Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eDeep Groove Ball Bearing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShield Type\u003c\/th\u003e\n\u003ctd\u003eZZ (double steel shield) \/ ZRS (steel + rubber seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e2–9 mm (0.08–0.35 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e5–30 mm (0.20–1.18 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth \/ Thickness\u003c\/th\u003e\n\u003ctd\u003e2.5–10 mm (0.10–0.39 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModel Range\u003c\/th\u003e\n\u003ctd\u003e603ZZ to 699ZZ (43 models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e4 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRing \u0026amp; Ball Material\u003c\/th\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003ePre-greased\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad Direction\u003c\/th\u003e\n\u003ctd\u003eRadial (primary); light axial loads supported\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\u003eCertification \/ Standard\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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 the right bearing size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the three dimensions of your existing bearing: inner diameter (ID), outer diameter (OD), and width. These are typically stamped on the bearing shield or listed in your equipment's service manual. Select the matching model number from the variant dropdown above — each option lists ID × OD × width in millimeters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between ZZ and ZRS shields?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eZZ bearings have a steel shield on both sides, providing good dust protection with minimal friction. ZRS bearings have a steel shield on one side and a rubber contact seal on the other, offering slightly better sealing against moisture and fine particles. For most dry, indoor applications ZZ is sufficient; choose ZRS where light moisture exposure is possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these bearings handle axial (thrust) loads?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDeep groove ball bearings are primarily designed for radial loads. They can accommodate moderate axial loads in both directions, but they are not a substitute for dedicated thrust bearings in applications where axial force is the dominant load. For mixed radial and light axial loads — such as RC motor shafts or printer lead screws — these bearings are appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings pre-lubricated, and can I re-grease them?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, each bearing comes pre-greased from the factory. The ZZ steel shields are non-contact and can be carefully removed with a thin pick to allow re-greasing if needed. Use a bearing-grade lithium or synthetic grease; avoid over-packing, which increases drag and heat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these fit my 3D printer, RC car, or skateboard wheels?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMany 3D printers use 608ZZ (8 × 22 × 7 mm) bearings for extruder idlers and axis rods. Common RC car and skateboard applications also use 608ZZ or 688ZZ. Check your equipment's bearing specification first, then select the matching variant. With 43 sizes available, most miniature bearing applications in the 2–9 mm ID range are covered.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat radial load capacity do these bearings have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eRated load capacity varies by model size — larger bearings carry higher loads. For specific dynamic and static load ratings (C and C₀ values) for your chosen model, please contact us to confirm. As a general guide, miniature bearings in the 603–699 series are suited for light-to-moderate loads typical of hobby, maker, and small-appliance applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo you sell individual bearings, or only in packs of 4?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach listing is sold as a pack of 4 identical bearings. This pack quantity is practical for symmetrical assemblies (e.g., four wheels on an RC car) and ensures you have spares on hand for future maintenance without reordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model IDxODxThick above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"603ZZ 3 x 9 x 5mm","offer_id":52409966264594,"sku":"ZBBPRTN021737x4","price":2.38,"currency_code":"USD","in_stock":true},{"title":"604ZZ 4 x 12 x 4mm","offer_id":52409966297362,"sku":"ZBBPRTN021738x4","price":2.52,"currency_code":"USD","in_stock":true},{"title":"605ZZ 5 x 14 x 5mm","offer_id":52409966330130,"sku":"ZBBPRTN021739x4","price":2.3,"currency_code":"USD","in_stock":true},{"title":"606ZZ 6 x 17 x 6mm","offer_id":52409966362898,"sku":"ZBBPRTN021740x4","price":2.52,"currency_code":"USD","in_stock":true},{"title":"607ZZ 7 x 19 x 6mm","offer_id":52409966395666,"sku":"ZBBPRTN021741x4","price":2.3,"currency_code":"USD","in_stock":true},{"title":"608ZZ 8 x 22 x 7mm","offer_id":52409966428434,"sku":"ZBBPRTN021742x4","price":3.39,"currency_code":"USD","in_stock":true},{"title":"608ZRS 8 x 22 x 7mm","offer_id":52409966461202,"sku":"ZBBPRTN021743x4","price":3.39,"currency_code":"USD","in_stock":true},{"title":"608ZRS 8 x 22 x 10mm","offer_id":52409966493970,"sku":"ZBBPRTN021744x4","price":8.28,"currency_code":"USD","in_stock":true},{"title":"609ZZ 9 x 24 x 7mm","offer_id":52409966526738,"sku":"ZBBPRTN021745x4","price":3.06,"currency_code":"USD","in_stock":true},{"title":"623ZZ 3 x 10 x 4mm","offer_id":52409966559506,"sku":"ZBBPRTN021746x4","price":2.38,"currency_code":"USD","in_stock":true},{"title":"624ZZ 4 x 13 x 5mm","offer_id":52409966592274,"sku":"ZBBPRTN021747x4","price":2.16,"currency_code":"USD","in_stock":true},{"title":"625ZZ 5 x 16 x 5mm","offer_id":52409966625042,"sku":"ZBBPRTN021748x4","price":2.11,"currency_code":"USD","in_stock":true},{"title":"626ZZ 6 x 19 x 6mm","offer_id":52409966657810,"sku":"ZBBPRTN021749x4","price":2.52,"currency_code":"USD","in_stock":true},{"title":"627ZZ 7 x 22 x 7mm","offer_id":52409966690578,"sku":"ZBBPRTN021750x4","price":2.79,"currency_code":"USD","in_stock":true},{"title":"628ZZ 8 x 24 x 8mm","offer_id":52409966723346,"sku":"ZBBPRTN021751x4","price":3.39,"currency_code":"USD","in_stock":true},{"title":"629ZZ 9 x 26 x 8mm","offer_id":52409966756114,"sku":"ZBBPRTN021752x4","price":3.79,"currency_code":"USD","in_stock":true},{"title":"635ZZ 5 x 19 x 6mm","offer_id":52409966788882,"sku":"ZBBPRTN021753x4","price":3.06,"currency_code":"USD","in_stock":true},{"title":"636ZZ 6 x 22 x 7mm","offer_id":52409966821650,"sku":"ZBBPRTN021754x4","price":3.33,"currency_code":"USD","in_stock":true},{"title":"637ZZ 7 x 26 x 9mm","offer_id":52409966854418,"sku":"ZBBPRTN021755x4","price":4.75,"currency_code":"USD","in_stock":true},{"title":"638ZZ 8 x 28 x 9mm","offer_id":52409966887186,"sku":"ZBBPRTN021756x4","price":5.43,"currency_code":"USD","in_stock":true},{"title":"639ZZ 9 x 30 x 10mm","offer_id":52409966919954,"sku":"ZBBPRTN021757x4","price":8.28,"currency_code":"USD","in_stock":true},{"title":"674ZZ 4 x 7 x 2.5mm","offer_id":52409966952722,"sku":"ZBBPRTN021758x4","price":2.57,"currency_code":"USD","in_stock":true},{"title":"675ZZ 5 x 8 x 2.5mm","offer_id":52409966985490,"sku":"ZBBPRTN021759x4","price":2.57,"currency_code":"USD","in_stock":true},{"title":"676ZZ 6 x 10 x 3mm","offer_id":52409967018258,"sku":"ZBBPRTN021760x4","price":2.98,"currency_code":"USD","in_stock":true},{"title":"677ZZ 7 x 11 x 3mm","offer_id":52409967051026,"sku":"ZBBPRTN021761x4","price":2.84,"currency_code":"USD","in_stock":true},{"title":"678ZZ 8 x 12 x 3.5mm","offer_id":52409967083794,"sku":"ZBBPRTN021762x4","price":3.2,"currency_code":"USD","in_stock":true},{"title":"679ZZ 9 x 14 x 5mm","offer_id":52409967116562,"sku":"ZBBPRTN021763x4","price":3.2,"currency_code":"USD","in_stock":true},{"title":"682ZZ 2 x 5 x 2.3mm","offer_id":52409967149330,"sku":"ZBBPRTN021764x4","price":2.84,"currency_code":"USD","in_stock":true},{"title":"683ZZ 3 x 7 x 3mm","offer_id":52409967182098,"sku":"ZBBPRTN021765x4","price":2.84,"currency_code":"USD","in_stock":true},{"title":"684ZZ 4 x 9 x 4mm","offer_id":52409967214866,"sku":"ZBBPRTN021766x4","price":2.57,"currency_code":"USD","in_stock":true},{"title":"685ZZ 5 x 11 x 5mm","offer_id":52409967247634,"sku":"ZBBPRTN021767x4","price":2.52,"currency_code":"USD","in_stock":true},{"title":"686ZZ 6 x 13 x 5mm","offer_id":52409967280402,"sku":"ZBBPRTN021768x4","price":2.38,"currency_code":"USD","in_stock":true},{"title":"687ZZ 7 x 14 x 5mm","offer_id":52409967313170,"sku":"ZBBPRTN021769x4","price":2.3,"currency_code":"USD","in_stock":true},{"title":"688ZZ 8 x 16 x 5mm","offer_id":52409967345938,"sku":"ZBBPRTN021770x4","price":2.3,"currency_code":"USD","in_stock":true},{"title":"689ZZ 9 x 17 x 5mm","offer_id":52409967378706,"sku":"ZBBPRTN021771x4","price":2.52,"currency_code":"USD","in_stock":true},{"title":"692ZZ 2 x 6 x 3mm","offer_id":52409967411474,"sku":"ZBBPRTN021772x4","price":2.57,"currency_code":"USD","in_stock":true},{"title":"693ZZ 3 x 8 x 4mm","offer_id":52409967444242,"sku":"ZBBPRTN021773x4","price":2.16,"currency_code":"USD","in_stock":true},{"title":"694ZZ 4 x 11 x 4mm","offer_id":52409967477010,"sku":"ZBBPRTN025324x4","price":2.16,"currency_code":"USD","in_stock":true},{"title":"695ZZ 5 x 13 x 4mm","offer_id":52409967509778,"sku":"ZBBPRTN021774x4","price":2.3,"currency_code":"USD","in_stock":true},{"title":"696ZZ 6 x 15 x 5mm","offer_id":52409967542546,"sku":"ZBBPRTN021775x4","price":2.3,"currency_code":"USD","in_stock":true},{"title":"697ZZ 7 x 17 x 5mm","offer_id":52409967575314,"sku":"ZBBPRTN021776x4","price":2.16,"currency_code":"USD","in_stock":true},{"title":"698ZZ 8 x 19 x 6mm","offer_id":52409967608082,"sku":"ZBBPRTN021777x4","price":2.57,"currency_code":"USD","in_stock":true},{"title":"699ZZ 9 x 20 x 6mm","offer_id":52409967640850,"sku":"ZBBPRTN021778x4","price":2.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of8_30035f2c-b829-498d-b9a0-f928b3c8bd84.jpg?v=1782355568","url":"https:\/\/homediyer.com\/products\/4pcs-deep-groove-ball-bearings-603-699zz","provider":"HomeDIYer","version":"1.0","type":"link"}