{"product_id":"51304-51311-thrust-ball-bearings-20-55mm-id","title":"51304-51311 Series 3 Part Thrust Ball Bearings 20\/25\/30\/35\/40\/45\/50\/55mm ID","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e51304–51311 Thrust Ball Bearings — Reliable Axial Load Control from 20 to 55mm ID\u003c\/h2\u003e\n\u003cp\u003eWhen axial loads cause premature wear, misalignment, or noisy operation in rotating assemblies, the root cause is often an undersized or incorrect bearing type. Engineers, maintenance technicians, and DIY builders working on lathes, gearboxes, automotive steering columns, and industrial machinery need a thrust bearing that holds its geometry under sustained one-directional load — without adding unnecessary radial bulk.\u003c\/p\u003e\n\u003cp\u003eThese 51304–51311 series 3-part thrust ball bearings consist of three precision-ground components: a shaft washer (tight-fit ring), a housing washer (loose-fit ring), and a ball-and-cage assembly seated between them. Available in eight bore sizes from 20mm (0.787 in) to 55mm (2.165 in), with corresponding outer diameters from 47mm (1.850 in) to 105mm (4.134 in) and thicknesses from 18mm (0.709 in) to 35mm (1.378 in). Order in quantities of 1, 2, 3, or 5 pieces to match your project scale.\u003c\/p\u003e\n\u003cp\u003eTypical applications include vertical shaft support in drill press columns, axial positioning in lathe tailstocks, thrust load management in automotive clutch release mechanisms, and preload control in CNC spindle assemblies. The standardized 513xx designation ensures cross-brand dimensional interchangeability for replacement and retrofit projects.\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 Dimensionally interchangeable with all ISO\/DIN 51300-series thrust ball bearings of the same designation. Verify shaft diameter and housing bore before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 51304–51311 Thrust Ball Bearings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e3-Part Separable Design\u003c\/strong\u003e\u003cbr\u003eShaft washer, housing washer, and ball-and-cage assembly are fully separable for easy installation, inspection, and replacement without disturbing adjacent components.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eEight Bore Sizes in One Listing\u003c\/strong\u003e\u003cbr\u003eCovers 51304 through 51311 — ID 20mm to 55mm — so you can match the exact shaft diameter without sourcing from multiple suppliers.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eDedicated Axial Load Capacity\u003c\/strong\u003e\u003cbr\u003eFlat-raceway geometry is optimized for single-direction axial (thrust) loads, maintaining consistent rolling contact under sustained push or pull forces.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eStandardized 513xx Dimensions\u003c\/strong\u003e\u003cbr\u003eConforms to ISO\/DIN 51300-series dimensional standards, ensuring drop-in interchangeability with OEM and aftermarket bearings of the same designation.\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, 2, 3, or 5-piece packs — order a single replacement unit or stock up for production runs and maintenance kits.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eBroad Industrial \u0026amp; DIY Compatibility\u003c\/strong\u003e\u003cbr\u003eSuited for lathes, drill presses, gearboxes, automotive steering and clutch systems, CNC spindles, and general rotating machinery requiring axial constraint.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Thrust Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Series\u003c\/th\u003e\n\u003ctd\u003e51304 \/ 51305 \/ 51306 \/ 51307 \/ 51308 \/ 51309 \/ 51310 \/ 51311\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eSingle-direction thrust ball bearing, 3-part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e20 \/ 25 \/ 30 \/ 35 \/ 40 \/ 45 \/ 50 \/ 55 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e47 \/ 52 \/ 60 \/ 68 \/ 78 \/ 85 \/ 95 \/ 105 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThickness (Height)\u003c\/th\u003e\n\u003ctd\u003e18 \/ 18 \/ 21 \/ 24 \/ 26 \/ 28 \/ 31 \/ 35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Parts\u003c\/th\u003e\n\u003ctd\u003e3 (shaft washer + housing washer + ball \u0026amp; cage assembly)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad Direction\u003c\/th\u003e\n\u003ctd\u003eSingle-direction axial (thrust)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensional Standard\u003c\/th\u003e\n\u003ctd\u003eISO \/ DIN 51300 series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1 Pcs \/ 2 Pcs \/ 3 Pcs \/ 5 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCage Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\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 correct bearing size for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bearing's inner diameter (ID) to your shaft diameter. For example, if your shaft is 30mm, select the 51306 (30×60×21mm). Always verify the outer diameter fits your housing bore and that the thickness suits your axial clearance. When in doubt, measure the existing bearing or shaft seat directly with calipers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a thrust ball bearing and a radial ball bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThrust ball bearings are designed exclusively for axial (push\/pull along the shaft axis) loads and cannot support significant radial loads. Radial ball bearings handle forces perpendicular to the shaft. If your application involves both load directions, a combined angular contact or tapered roller bearing may be more appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these bearings handle loads in both axial directions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. The 513xx series is a single-direction thrust bearing. It supports axial load in one direction only. For bidirectional axial loads, you would need a double-direction thrust bearing (522xx or 532xx series) or two opposing single-direction units.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings corrosion-resistant or suitable for wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard 513xx thrust ball bearings use carbon steel raceways and are not inherently corrosion-resistant. For damp or washdown environments, apply a compatible grease or consider stainless-steel variants. Contact us to confirm material options if corrosion resistance is a hard requirement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication does this bearing require?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese open-type thrust ball bearings require external lubrication — typically a lithium-based grease (NLGI Grade 2) or a light machine oil depending on speed and load. Apply lubricant to the ball-and-cage assembly before installation and re-lubricate at regular maintenance intervals based on operating conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm this bearing is interchangeable with my existing one?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCheck the designation stamped on your existing bearing (e.g., 51306, 51308). If it matches one of the sizes listed here, the dimensions conform to ISO\/DIN 51300-series standards and the replacement will be dimensionally compatible. Always cross-check ID, OD, and thickness against your housing drawings before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy should I order multiple pieces at once?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOrdering 2, 3, or 5 pieces at once reduces per-unit cost and ensures you have spares on hand for scheduled maintenance or unexpected failures. For production machinery or fleet vehicles, keeping matched spares in stock minimizes downtime when a bearing needs replacement.\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":"51304 (20x47x18mm) \/ 1 Pcs","offer_id":52410189414674,"sku":"GY$$$SHXJZC1575x1","price":5.55,"currency_code":"USD","in_stock":true},{"title":"51305 (25x52x18mm) \/ 1 Pcs","offer_id":52410189447442,"sku":"GY$$$SHXJZC1576x1","price":6.94,"currency_code":"USD","in_stock":true},{"title":"51306 (30x60x21mm) \/ 1 Pcs","offer_id":52410189480210,"sku":"GY$$$SHXJZC1577x1","price":10.38,"currency_code":"USD","in_stock":true},{"title":"51307 (35x68x24mm) \/ 1 Pcs","offer_id":52410189512978,"sku":"GY$$$SHXJZC1578x1","price":13.94,"currency_code":"USD","in_stock":true},{"title":"51308 (40x78x26mm) \/ 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