[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-649221-105":59,"doc-detail-649221-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","drawing-indication-of-surface-texture-iso-13021999","Drawing Indication of Surface Texture - ISO 1302:1999","","Guidance explains how surface finish and material removal requirements should be unambiguously indicated on technical drawings, highlighting limitations of older conventions such as triangle symbols and obsolete ‘N’ notation. The content compares conventional symbols versus ISO 1302:1999 graphical symbols, clarifying whether material removal is required, not permitted, or unspecified. It also lists necessary complementary parameters (bandwidth/sample length, cut-off, filter type, lay & orientation, and machining allowance) and demonstrates example designations, including use of the 16% rule and evaluation length assumptions for measurement.",{"@graph":69,"@context":122},[70,84,105],{"@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/drawing-indication-of-surface-texture-iso-13021999/649221/",{"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/drawing-indication-of-surface-texture-iso-13021999/649221.png","ImageObject",300,407,{"name":92,"@type":93},"Aria","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-25","2026-10-23",true,{"@type":102,"interactionType":103,"userInteractionCount":14},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Why are the older triangle symbols and ‘N’ notation for surface finish indication considered obsolete?","Question",{"text":112,"@type":113},"They have been superseded by ISO 1301 and are no longer valid. The ‘N’ number method for surface finish indication is also stated as obsolete.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What information can ambiguous conventional surface texture symbols fail to provide?",{"text":117,"@type":113},"They can be interpreted without specifying how to achieve the finish, whether material removal is allowed, which parameter is being measured, which cut-off and filter type to use, or whether the stated value is the maximum allowable value.",{"name":119,"@type":110,"acceptedAnswer":120},"What additional parameters must be included to make surface finish requirements unambiguous on drawings?",{"text":121,"@type":113},"The guidance requires adding bandwidth/sample length and parameter values (a), manufacturing method (c), surface lay & orientation (d), machining allowance (e), and clarifies filter type and evaluation length, including typical default assumptions.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},649221,1792904277,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":14,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},2336464648322,"https://ap-avatar.wpscdn.com/avatar/2200025388227c56fec?_k=1778556882303663488","125 years of innovation  \nDrawing Indication  \nGlobal Excellence in Metrology  \nContents  \n• Considerations  \n• Early / Obsolete Methods  \n• Requirement for Surface Texture  \n• Drawing Indication of Surface Lay  \n• 16% Rule  \n• Max Rule  \nGlobal Excellence in Metrology  \nConsiderations  \n• Traverse Length?  \n• Cut-off?  \n• Form Type?  \n• Filter type?  \n• Number of Cut-offs?  \n• Appropriate Parameters?  \n• Tip Type / Radius?  \n• Bandwidth?  \n• Where to measure?  \n• Lay / Direction Of Measurement?  \nGlobal Excellence in Metrology  \nEarly / Obsolete Methods  \nMaximum Permissible Value Rt (µm)  \n• Triangle symbols are used on many drawings  \n• This method is no longer valid and was cancelled in 1978  \n• It has been superseded by ISO 1301  \nGlobal Excellence in Metrology  \nTriangle Symbols are obsolete.  \nUse of 'N' number to indicate surface finish indication is also obsolete.  \nGraphical Symbols For Surface Texture  \nConventional Surface Texture Symbol  \nGlobal Excellence in Metrology  \nThe above slide shows the conventional method of indicating a surface finish requirement on a technical drawing, implying to someone measuring the surface that a maximum Ra value of 6.8µm is allowed. The symbol would also indicate the maximum allowable surface finish to the person producing the surface.  \nThis method of indication is open to a lot of interpretation. It does not tell the machinist how to achieve the required finish nor whether removal of any material to achieve the specified finish is allowed. No information is given to the person measuring the surface as to which parameter is being measured, which cut-offis to be used, which filter type should be used nor whether the specified value is in fact the maximum allowable value.  \n\n| Graphical Symbols For Surface Texture |  |  |\n| --- | --- | --- |\n| | 2\u003Cbr>\u003Cbr>Requirement for\u003Cbr>Surface Texture, Material Removal\u003Cbr>Required | 3\u003Cbr>\u003Cbr>Requirement for\u003Cbr>Surface Texture, Material Removal Not Permitted |\n| \u003Cbr>Global Excellence in Metrology\u003Cbr>|  |  |\n\nTo improve clarification of how surface texture is specified on technical drawings the international standard, ISO 1302:1999, has been produced. The above slideshows the three basic graphical symbols used with complementary information to indicate surface texture requirements. Each symbol has the basic following meaning:  \n1. Indicates that a requirement for surface texture exists but does not say if removal of material to achieve the specified finish is allowed or required.  \n2. Indicates that the removal of material by machining is required to obtain the required finish.  \n3. Indicates that removal of material is not permitted to obtain the required finish. This symbol would probably be used on a coated surface.  \nGraphical Symbols For Surface Texture  \n(c) Turned  \n(a) 0.0025-0.8/Rz 6.8  \n(b) 0.0025-0.8/Ra 2.2  \n(e) 3 (d)   \nGlobal Excellence in Metrology  \nIn order to ensure unambiguity when specifying surface finish requirements it is necessary to to add the the indication of the following:  \n(a)= Bandwidth/sample length/parameter numerical value  \n(b)= can be used for more parameter values  \n(c)= manufacturing method  \n(d)= surface lay & orientation  \n(e)= machining allowance  \nThe above symbol indicates that the removal of material by turning is required to achieve an Ra value of 2.2µm and an Rz value of 6.8µm when measured using a 0.8mm cut off and lower cut of value of 0.0025mm with Gaussian filtering. The maximum amount of material removal allowed to achieve the required finish would be 3mm. The surface lay direction and orientation would be perpendicular to the view of the symbol. Unless otherwise specified measurements should be made using a 0.8mm Gaussian filter with an evaluation length of five sample lengths.  \nNote: The 16% rule for parameter values is the default rule for all surface finish requirements specified on a drawing. (see 16% and MAX rule)  \n\n| Drawing Indication of Surface Lay |  |\n| --- | --- |\n| | See ISO 1302 ","cbCaisntDZth7VKl","https://ap.wps.com/l/cbCaisntDZth7VKl","pdf",253040,13,"English","# Considerations\n## Traverse Length?\n## Cut-off?\n## Form Type?\n## Filter type?\n## Number of Cut-offs?\n## Appropriate Parameters?\n## Tip Type / Radius?\n## Bandwidth?\n## Where to measure?\n## Lay / Direction Of Measurement?\n# Early / Obsolete Methods\n## Maximum Permissible Value Rt (µm)\n## Triangle symbols and obsolete N notation\n# Graphical Symbols For Surface Texture\n## Conventional Surface Texture Symbol\n## ISO 1302:1999 three basic graphical symbols\n# Drawing Indication of Surface Lay\n# 16% Rule and MAX Rule\n# Parameter designation and examples\n## Bi-Lateral Tolerance (U/L)","[{\"question\":\"Why are the older triangle symbols and ‘N’ notation for surface finish indication considered obsolete?\",\"answer\":\"They have been superseded by ISO 1301 and are no longer valid. The ‘N’ number method for surface finish indication is also stated as obsolete.\"},{\"question\":\"What information can ambiguous conventional surface texture symbols fail to provide?\",\"answer\":\"They can be interpreted without specifying how to achieve the finish, whether material removal is allowed, which parameter is being measured, which cut-off and filter type to use, or whether the stated value is the maximum allowable value.\"},{\"question\":\"What additional parameters must be included to make surface finish requirements unambiguous on drawings?\",\"answer\":\"The guidance requires adding bandwidth/sample length and parameter values (a), manufacturing method (c), surface lay \\u0026 orientation (d), machining allowance (e), and clarifies filter type and evaluation length, including typical default assumptions.\"}]","Drawing Indication of Surface Texture - ISO 1302:1999 | PDF",1792797962,33]