[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-649253-105":59,"doc-detail-649253-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","surface-roughness-drawing-indication-of-surface-texture-definitions-and-typical-calculations","Surface Roughness - Drawing Indication of Surface Texture - Definitions and Typical Calculations","","Surface Roughness presents technical data from JIS B standards for indicating surface texture on industrial drawings. It defines key indicators including arithmetic average roughness (Ra), maximum height (Ry), ten-spot average roughness (Rz), and other parameters used to quantify surface features. Typical calculation methods are provided, along with reference relations between Ra, Ry/Rz, and conventional finish symbols. The document also explains how auxiliary symbols, cut-off value, reference/evaluation lengths, machining method, grain direction, and surface undulation are positioned around the surface symbol, including relevant remarks and figure references.",{"@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/surface-roughness-drawing-indication-of-surface-texture-definitions-and-typical-calculations/649253/",{"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/surface-roughness-drawing-indication-of-surface-texture-definitions-and-typical-calculations/649253.png","ImageObject",300,407,{"name":92,"@type":93},"Fahsai","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-23",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does arithmetic average roughness (Ra) measure in surface roughness standards?","Question",{"text":112,"@type":113},"Ra is the arithmetic average of values at randomly extracted spots on the surface, using a reference-length portion cut from the roughness curve.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are maximum height (Ry) and ten-spot average roughness (Rz) determined?",{"text":117,"@type":113},"Ry measures the gap between the peak line and trough line over a reference length. Rz is the sum of the averaged highest peaks to the fifth peak and the averaged lowest troughs to the fifth trough, each referenced from the average line.",{"name":119,"@type":110,"acceptedAnswer":120},"What auxiliary symbols are used around a surface symbol on drawings?",{"text":121,"@type":113},"Auxiliary symbols indicate items such as Ra value, machining method, cut-off value and evaluation length, reference length, grain direction, other parameters (e.g., tp), and surface undulation; remarks clarify when symbols are provided and how finish ranges may be indicated.","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},649253,1792798501,{"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":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":14,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":24},549768702563,"https://ap-avatar.wpscdn.com/avatar/8000c4aa63b76e948b?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786536092046926083","’Technical Data»  \nSurface Roughness  \nExcerpt from and  \nJIS B  \nJIS B  \n0601  \n0031  \n(1994)  \n(1994)  \n’Technical Data»  \nDrawing Indication of Surface Texture  \nExcerpt from JIS B 0031 (1994)  \n1. Varieties of Surface Roughness Indicators  \nDefinitions and presentations of arithmetic average roughness (Ra), maximum height (Ry) , 10-spot average roughness (Rz) , average concave-to-convex distance (Sm) , average distance between local peaks (S) and load length rate (tp) are given as parameters indicating the surface roughness of an industrial product. Surface roughness is the arithmetic average of values at randomly extracted spots on the surface of an object.  \n’Center-line average roughness (Ra 75) is defined in the supplements to JIS B 0031 and JIS B 0601.»  \nTypical Calculations of Surface Roughness  \n\n| Arithmetical Average Roughness, Ra\u003Cbr>A portion stretching over a reference length in the direction in which the average line extends is cut out from the roughness curve. This portion is presented in a new graph with the X axis extending in the same direction as the average line and the Y axis representing the magnitude. Ra is represented by the equation shown at right, in microns ( Om) . | \u003Cbr>Ra |  |\n| --- | --- | --- |\n| Maximum Height, Ry\u003Cbr>A portion stretching over a reference length in the direction in which the average line extends is cut out from the roughness curve. The gap between the peak line and the trough line is measured in the direction in which the magnitude axis extends, in microns ( Om) .\u003Cbr>Remark : A portion without an abnormally high peak or abnormally low trough, which may be regarded as a flaw, is cut out over the reference length. | r\u003Cbr>\u003Cbr>Rp\u003Cbr>Ry\u003Cbr>Rv\u003Cbr>Ry = Rp+Rv |  |\n| Ten-Spot Average Roughness, Rz\u003Cbr>A portion stretching over a reference length in the direction in which the average line extends is cut out from the roughness curve. The average of the levels (Yp) of the highest peak to the fifth highest peak as measured from the average line and the average of the levels (Yv) of the lowest trough to the fifth lowest trough similarly measured in the said portion are added together. Rz is this sum, in microns ( Om) . | \u003Cbr>Rz = Yp 1 +Yp 2 +Yp 3 +Yp 4 +Yp 5 + Yv 1 +Yv 2 +Yv 3 +Yv 4 +Yv 5 \u003Cbr>5 |  |\n|  | Yp1 , Yp2 , Yp3 , Yp4 , Yp5\u003Cbr>Yv1 , Yv2 , Yv3 , Yv4 , Yv5 : | Levels of the highest peak to the fifth highest peak in the said portion with the length r .\u003Cbr>Levels of the lowest trough to the fifth highest trough in the said portion with the length r . |\n\nReference : Relation between Arithmetic Average Roughness (Ra) and Conventional Parameters  \n\n| Arithmetic Average Roughness\u003Cbr>Ra |  |  |  | Max. Height\u003Cbr>Ry |  | Ten-Spot Average Roughness\u003Cbr>Rz |  | Reference\u003Cbr>Ry/Rz Length\u003Cbr>r ( mm) | Conventional\u003Cbr>Finish Symbol |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| Standard Series |  | Cut-Off Value 􀀂 c ( mm) | Graphical Representation of Surface Texture | Standard Series |  |  |  |  |  |\n| 0.012\u003Cbr>0.025\u003Cbr>0.05\u003Cbr>0.1\u003Cbr>0.2 | a\u003Cbr>a\u003Cbr>a\u003Cbr>a\u003Cbr>a | 0.08 | 0.012 ~ 0.2\u003Cbr>| 0.05 s\u003Cbr>0.1 s\u003Cbr>0.2 s\u003Cbr>0.4 s\u003Cbr>0.8 s |  | 0.05 z\u003Cbr>0.1 z\u003Cbr>0.2 z\u003Cbr>0.4 z\u003Cbr>0.8 z |  | 0.08 | |\n|  |  | 0.25 |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  | 0.25 |  |\n|  |  | 0.8 |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  | 0.8 |  |\n| 0.4\u003Cbr>0.8\u003Cbr>1.6 | a\u003Cbr>a\u003Cbr>a |  | 0.4 ~ 1.6\u003Cbr>| 1.6\u003Cbr>3.2\u003Cbr>6.3 | s\u003Cbr>s\u003Cbr>s | 1.6\u003Cbr>3.2\u003Cbr>6.3 | z\u003Cbr>z\u003Cbr>z |  | |\n| 3.2\u003Cbr>6.3 | a\u003Cbr>a | 2.5 | 3.2 ~ 6.3\u003Cbr>| 12.5 s\u003Cbr>25 s |  | 12.5 z\u003Cbr>25 z |  | 2.5 | |\n| 12.5 a\u003Cbr>25 a |  | 8 | 12.5 ~ 25\u003Cbr>| 50 s\u003Cbr>100 s |  | 50 z\u003Cbr>100 z |  |  | |\n|  |  |  |  |  |  |  |  | 8 |  |\n| 50 a\u003Cbr>100 a |  |  | 50 ~ 100\u003Cbr>| 200 s\u003Cbr>400 s |  | 200 z\u003Cbr>400 z |  |  | ~ |\n|  |  | - |  |  |  |  |  | - |  |\n\n* Interrelations among the three varieties shown here are not precise, and are presented for convenience only.  \n* Ra : The evaluated values of Ry and Rz are the cut-off values and the reference length eac","cbCaiqkew0YCO4ka","https://ap.wps.com/l/cbCaiqkew0YCO4ka","pdf",134454,"English","# Varieties of Surface Roughness Indicators\n# Typical Calculations of Surface Roughness\n## Arithmetical Average Roughness, Ra\n## Maximum Height, Ry\n## Ten-Spot Average Roughness, Rz\n# Reference: Relation Between Ra and Conventional Parameters\n# Positions of Auxiliary Symbols for Surface Symbol","[{\"question\":\"What does arithmetic average roughness (Ra) measure in surface roughness standards?\",\"answer\":\"Ra is the arithmetic average of values at randomly extracted spots on the surface, using a reference-length portion cut from the roughness curve.\"},{\"question\":\"How are maximum height (Ry) and ten-spot average roughness (Rz) determined?\",\"answer\":\"Ry measures the gap between the peak line and trough line over a reference length. Rz is the sum of the averaged highest peaks to the fifth peak and the averaged lowest troughs to the fifth trough, each referenced from the average line.\"},{\"question\":\"What auxiliary symbols are used around a surface symbol on drawings?\",\"answer\":\"Auxiliary symbols indicate items such as Ra value, machining method, cut-off value and evaluation length, reference length, grain direction, other parameters (e.g., tp), and surface undulation; remarks clarify when symbols are provided and how finish ranges may be indicated.\"}]","Surface Roughness - Drawing Indication of Surface Texture - Definitions and Typical Calculations | PDF"]