{"product_id":"624-629-2rs-zz-miniature-deep-groove-ball-bearings-double-sealed-gcr15-steel","title":"624-629 2RS\/ZZ Miniature Deep Groove Ball Bearings Double Sealed GCR15 Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e624–629 Miniature Deep Groove Ball Bearings — Reliable Sealing for Tight Spaces\u003c\/h2\u003e\n\u003cp\u003eWhen a seized bearing brings a 3D printer, RC car, or small motor to a grinding halt, finding the right miniature replacement fast is critical. These 624–629 series miniature deep groove ball bearings are designed for makers, hobbyists, engineers, and repair technicians who need a dependable drop-in solution across a wide range of compact rotating assemblies.\u003c\/p\u003e\n\u003cp\u003eAvailable in two seal types — \u003cstrong\u003e2RS\u003c\/strong\u003e (double rubber contact seal) and \u003cstrong\u003eZZ\u003c\/strong\u003e (double metal shield) — these bearings are manufactured from \u003cstrong\u003eGCR15 bearing steel\u003c\/strong\u003e (equivalent to AISI 52100 chrome steel) with a precision-ground raceway. Bore diameters range from \u003cstrong\u003e4 mm to 9 mm\u003c\/strong\u003e (approx. 5\/32\" to 23\/64\"), with outer diameters from \u003cstrong\u003e13 mm to 26 mm\u003c\/strong\u003e and widths of \u003cstrong\u003e5 mm to 8 mm\u003c\/strong\u003e, covering the full 624 \/ 625 \/ 626 \/ 627 \/ 628 \/ 629 designation range.\u003c\/p\u003e\n\u003cp\u003eTypical applications include \u003cstrong\u003eminiature deep groove ball bearing replacement for 3D printers\u003c\/strong\u003e (idler pulleys, extruder arms), \u003cstrong\u003eRC vehicle wheel hubs and steering pivots\u003c\/strong\u003e, \u003cstrong\u003esmall electric motor shaft support\u003c\/strong\u003e, inline skate wheels, fidget spinners, and light-duty conveyor rollers — anywhere a compact, low-friction rotating support is needed.\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 Fits standard 624 \/ 625 \/ 626 \/ 627 \/ 628 \/ 629 bearing seats. Verify bore (ID), outer diameter (OD), and width against your application before ordering. 2RS seal suits dusty or lightly oiled environments; ZZ shield suits dry, higher-speed applications.\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\u003eDual Seal Options\u003c\/strong\u003e\u003cbr\u003eChoose \u003cstrong\u003e2RS\u003c\/strong\u003e rubber contact seals for superior dust and light-moisture exclusion, or \u003cstrong\u003eZZ\u003c\/strong\u003e metal shields for lower drag at higher rotational speeds — both sides sealed for extended service life.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eGCR15 Chrome Steel Construction\u003c\/strong\u003e\u003cbr\u003eRaceway and balls are made from GCR15 bearing-grade chrome steel, delivering consistent hardness (typically 60–64 HRC), fatigue resistance, and dimensional stability across repeated load cycles.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eFull 624–629 Size Range\u003c\/strong\u003e\u003cbr\u003eSix bore sizes from 4 mm to 9 mm in a single listing — select the exact designation (624 \/ 625 \/ 626 \/ 627 \/ 628 \/ 629) and quantity that matches your project without ordering from multiple sources.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDeep Groove Raceway Design\u003c\/strong\u003e\u003cbr\u003eThe deep groove geometry accommodates both radial and moderate axial loads, making these bearings suitable for combined-load applications such as motor shafts, pulley idlers, and wheel hubs.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\u003cbr\u003eAvailable in 1, 4, 10, or 20-piece packs — order a single bearing for a quick repair or stock up in bulk for ongoing builds, prototyping runs, or workshop inventory.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eDrop-In Standard Dimensions\u003c\/strong\u003e\u003cbr\u003eManufactured to ISO\/ABEC standard dimensional tolerances, ensuring interchangeability with OEM and aftermarket bearing seats that specify 62x-series miniature bearings.\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\u003eBearing Series\u003c\/th\u003e\n\u003ctd\u003e624 \/ 625 \/ 626 \/ 627 \/ 628 \/ 629\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeal Type\u003c\/th\u003e\n\u003ctd\u003e2RS (rubber contact seal) or ZZ (metal shield)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eGCR15 chrome bearing steel (AISI 52100 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 7 mm \/ 8 mm \/ 9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e13 mm \/ 16 mm \/ 19 mm \/ 22 mm \/ 24 mm \/ 26 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003e5 mm \/ 5 mm \/ 6 mm \/ 7 mm \/ 8 mm \/ 8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eFactory-greased (2RS) \/ Unlubricated or lightly oiled (ZZ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSealing (both sides)\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad Type Supported\u003c\/th\u003e\n\u003ctd\u003eRadial + moderate axial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 4 pcs \/ 10 pcs \/ 20 pcs\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\u003eTolerance Class\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\u003eWhat is the difference between 2RS and ZZ bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e\u003cstrong\u003e2RS\u003c\/strong\u003e bearings have rubber contact seals on both sides that physically touch the inner ring, providing better exclusion of dust, dirt, and light moisture — ideal for 3D printers, outdoor RC vehicles, and dusty workshop environments. \u003cstrong\u003eZZ\u003c\/strong\u003e bearings use non-contact metal shields that leave a small gap, resulting in lower friction and drag, making them better suited for higher-speed, dry applications such as small electric motors and fans. If in doubt, 2RS is the more protective choice for general DIY use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bearing size (624 vs 625 vs 626, etc.)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bearing designation to your application's bore (inner diameter), outer diameter, and width. The variant names include all three dimensions — for example, \u003cstrong\u003e625-2RS 5×16×5mm\u003c\/strong\u003e means 5 mm bore, 16 mm OD, 5 mm wide. Measure your existing bearing or bearing seat with calipers before ordering. The 624 series (4 mm bore) is common in 3D printer idler pulleys; the 626–629 range suits slightly larger motors and wheel hubs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCR15 chrome steel is the standard material for precision ball bearings worldwide, offering a typical hardness of 60–64 HRC and good fatigue life under cyclic radial loads. These miniature bearings are well-suited for light-to-moderate radial loads in compact mechanisms. They are not intended for heavy industrial machinery, high-impact loads, or continuous operation at elevated temperatures. For specific dynamic load ratings, refer to the bearing designation in a standard bearing catalog (e.g., SKF, NSK equivalent data for 62x series).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCR15 chrome steel provides moderate corrosion resistance suitable for indoor and dry outdoor use. The 2RS rubber seals help keep moisture out of the raceway. However, these are not stainless steel bearings — for applications with continuous water exposure, salt spray, or aggressive chemicals, consider stainless steel (AISI 440C) alternatives. For typical DIY, hobby, and light-industrial use in normal environments, these bearings perform reliably.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as a direct replacement for OEM bearings in my 3D printer or RC car?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided the bore, outer diameter, and width match your OEM specification. The 624 and 625 sizes are among the most common bearings used in FDM 3D printer idler pulleys (often pressed into GT2 pulley bores), and the 626–629 range covers many RC car wheel hubs and steering knuckles. Always verify dimensions with calipers before installation. These bearings conform to standard ISO dimensional tolerances for interchangeability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I buy 1 pc or a multi-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIf you need a single emergency replacement, the 1-piece option gets you back up and running quickly. However, bearings in high-cycle applications (3D printer idlers, RC drivetrains) tend to wear in sets — buying a 4, 10, or 20-piece pack means you have spares on hand for the next service interval and typically lowers the per-unit cost. For workshop stock or ongoing builds, the 10 or 20-piece packs offer the best value per bearing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these bearings come pre-lubricated?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2RS\u003c\/strong\u003e variants are factory-greased — the rubber seals retain the grease inside the raceway for the bearing's service life. The \u003cstrong\u003eZZ\u003c\/strong\u003e metal-shield variants may have a light oil film applied at the factory; for higher-speed or precision applications, you can add a small amount of appropriate bearing oil through the shield gap. Do not over-lubricate, as excess grease increases drag and heat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"624-2RS 4*13*5mm \/ 1pcs","offer_id":52410766524690,"sku":"GLFBNHHSHXJZC5996x1","price":2.57,"currency_code":"USD","in_stock":true},{"title":"625-2RS 5*16*5mm \/ 1pcs","offer_id":52410766557458,"sku":"GLFBNHHSHXJZC5997x1","price":2.43,"currency_code":"USD","in_stock":true},{"title":"626-2RS 6*19*6mm \/ 1pcs","offer_id":52410766590226,"sku":"GLFBNHHSHXJZC5998x1","price":2.43,"currency_code":"USD","in_stock":true},{"title":"627-2RS 7*22*7mm \/ 1pcs","offer_id":52410766622994,"sku":"GLFBNHHSHXJZC5999x1","price":2.43,"currency_code":"USD","in_stock":true},{"title":"628-2RS 8*24*8mm \/ 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