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No. E728h provides structured guidance on ISO bearing engineering fundamentals, including the ISO dimensional system and the formulation of bearing numbers, with coverage of specific types such as tapered roller bearings and miniature ball bearings. It further explains auxiliary bearing symbols and then expands into bearing performance topics: dynamic load rating, equivalent dynamic load, fatigue life, static load ratings, and conversion methods referenced to life at 500 min-1 and 3 000 hours. Later sections address bearing fitting practice, internal clearance behavior, and internal load distribution with displacement analysis.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/iso-dimensional-system-and-bearing-numbers-technical-report/290015/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/iso-dimensional-system-and-bearing-numbers-technical-report/290015.png","ImageObject",300,407,{"name":92,"@type":93},"Ophelia","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-09-17",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",14,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What topics are covered in the ISO bearing numbers section?","Question",{"text":113,"@type":114},"It explains the ISO dimensional system, how bearing numbers are formulated, specific formats for tapered roller bearings (inch system) and miniature ball bearings, and auxiliary bearing symbols.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How does the report address fatigue life for bearings?",{"text":118,"@type":114},"It covers dynamic load rating, dynamic equivalent load, effects of fluctuating load and speed, life calculation for multiple bearings as a group, and methods for analyzing fatigue including oil film parameter topics.",{"name":120,"@type":111,"acceptedAnswer":121},"What fitting and clearance subjects are included after load and life topics?",{"text":122,"@type":114},"It presents bearing fitting practice (interference, clearance, fit calculation, tolerances, and mounting loads) and internal clearance concepts, including residual clearance after mounting and the effects of temperature differences.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},290015,1789639837,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":140,"language":141,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":142,"faqs":143,"seo_title":144,"seo_description":67,"update_tm":130,"read_time":145,"preview_page_count":4},7971461741311,"https://ap-avatar.wpscdn.com/avatar/74000253aff267980c6?x-image-process=image/resize,m_fixed,w_180,h_180&k=1779345379180704826","Technical Report  \nCAT. No. E728h  \nCONTENTS  \nPages  \n1. ISO Dimensional system and bearing numbers  \n1.1 ISO Dimensional system …………………………………………………………… 6  \n1.2 Formulation of bearing numbers…………………………………………………… 8  \n1.3 Bearing numbers for tapered roller bearings (inch system)………………… 10  \n1.4 Bearing numbers for miniature ball bearings ………………………………… 12  \n1.5 Auxiliary bearing symbols ……………………………………………………… 14  \n2. Dynamic load rating, fatigue life, and static load rating  \n2.1 Dynamic load rating ……………………………………………………………… 18  \n2.2 Dynamic equivalent load ………………………………………………………… 22  \n2.3 Dynamic equivalent load of triplex angular contact ball bearings…………… 24  \n2.4 Average of fluctuating load and speed………………………………………… 26  \n2.5 Combination of rotating and stationary loads ………………………………… 28  \n2.6 Life calculation of multiple bearings as a group ……………………………… 30  \n2.7 Load factor and fatigue life by machine ……………………………………… 32  \n2.8 Radial clearance and fatigue life………………………………………………… 34  \n2.9 Misalignment of inner/outer rings and fatigue life of deep-groove ball bearings ……………………………………………………………………… 36  \n2.10 Misalignment of inner/outer rings and fatigue life of cylindrical roller bearings …………………………………………………………………… 38  \n2.11 Fatigue life and reliability ………………………………………………………… 40  \n2.12 Oil film parameters and rolling fatigue life……………………………………… 42  \n2.13 EHL oil film parameter calculation diagram …………………………………… 44  \n2.13.1 Oil film parameter …………………………………………………………… 44  \n2.13.2 Oil film parameter calculation diagram …………………………………… 44  \n2.13.3 Effect of oil shortage and shearing heat generation……………………… 48  \n2.14 Fatigue analysis…………………………………………………………………… 50  \n2.14.1 Measurement of fatigue degree …………………………………………… 50  \n2.14.2 Surface and sub-surface fatigues…………………………………………… 52  \n2.14.3 Analysis of practical bearing (1)…………………………………………… 54  \n2.14.4 Analysis of practical bearing (2)…………………………………………… 56  \n2.15 Conversion of dynamic load rating with reference to life at 500 min–1 and  \n3 000 hours ……………………………………………………………………… 58  \n2.16 Basic static load ratings and static equivalent loads ………………………… 60  \n3. Bearing fitting practice  \n3.1 Load classifications ……………………………………………………………… 62  \n3.2 Required effective interference due to load …………………………………… 64  \n3.3 Interference deviation due to temperature rise (aluminum housing, plastic housing)…………………………………………… 66  \n3.4 Fit calculation……………………………………………………………………… 68  \n3.5 Surface pressure and maximum stress on fitting surfaces ………………… 70  \n3.6 Mounting and withdrawal loads ………………………………………………… 72  \n3.7 Tolerances for bore diameter and outside diameter ………………………… 74  \nPages  \n3.8 Interference and clearance for fitting (shafts and inner rings)……………… 76  \n3.9 Interference and clearance for fitting (housing holes and outer rings)……… 78  \n3.10 Interference dispersion (shafts and inner rings)……………………………… 80  \n3.11 Interference dispersion (housing bores and outer rings) …………………… 82  \n3.12 Fits of four-row tapered roller bearings (metric) for roll necks ……………… 84  \n4. Internal clearance  \n4.1 Internal clearance ………………………………………………………………… 86  \n4.2 Calculating residual internal clearance after mounting ……………………… 88  \n4.3 Effect of interference fit on bearing raceways (fit of inner ring)……………… 90  \n4.4 Effect of interference fit on bearing raceways (fit of outer ring) …………… 92  \n4.5 Reduction in radial internal clearance caused by a temperature difference between inner and outer rings……………………………………… 94  \n4.6 Radial and axial internal clearances and contact angles for single row deep groove ball bearings ……………………………………………………… 96  \n4.6.1 Radial and axial internal clearances ………………………………………… 96  \n4.6.2 Relation between radial clearance and contact angle …………………… 98  \n4.7 Angular clearances in single-row deep groove ball bearings………………… 100  \n4.8 Relationship between radial and axial clearances in double-row angular contact ball bearings …………………………………………………………… 102  \n4.9 Angular clearances in double-row angular c","cbCaiswpf5RrfLon","https://ap.wps.com/l/cbCaiswpf5RrfLon","pdf",8646088,154,"English","# Contents\n## ISO Dimensional system and bearing numbers\n## Dynamic load rating, fatigue life, and static load rating\n## Bearing fitting practice\n## Internal clearance\n## Bearing internal load distribution and displacement\n## Preload and axial displacement\n## Starting and running torques","[{\"question\":\"What topics are covered in the ISO bearing numbers section?\",\"answer\":\"It explains the ISO dimensional system, how bearing numbers are formulated, specific formats for tapered roller bearings (inch system) and miniature ball bearings, and auxiliary bearing symbols.\"},{\"question\":\"How does the report address fatigue life for bearings?\",\"answer\":\"It covers dynamic load rating, dynamic equivalent load, effects of fluctuating load and speed, life calculation for multiple bearings as a group, and methods for analyzing fatigue including oil film parameter topics.\"},{\"question\":\"What fitting and clearance subjects are included after load and life topics?\",\"answer\":\"It presents bearing fitting practice (interference, clearance, fit calculation, tolerances, and mounting loads) and internal clearance concepts, including residual clearance after mounting and the effects of temperature differences.\"}]","ISO Dimensional System and Bearing Numbers - Technical Report | PDF",388]