[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-649261-105":59,"doc-detail-649261-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-method-of-indicating-surface-texture-on-drawings","Surface Roughness - Method of Indicating Surface Texture on Drawings","","Technical excerpt specifying how surface roughness is defined and indicated on industrial drawings, referencing JIS B 0601 and JIS B 0031 and JIS Z B 0031. It defines key parameters including arithmetical mean roughness (Ra), maximum height (Ry), ten-point mean roughness (Rz), spacing parameters (Sm, S) and profile bearing length ratio (tp). Typical measurement approaches are given for Ra, Ry and Rz, with units in micrometers and related reference tables.",{"@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-method-of-indicating-surface-texture-on-drawings/649261/",{"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-method-of-indicating-surface-texture-on-drawings/649261.png","ImageObject",300,407,{"name":92,"@type":93},"Aditya","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-23",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What are the main surface roughness parameters defined in the excerpt?","Question",{"text":112,"@type":113},"The excerpt defines arithmetical mean roughness (Ra), maximum height (Ry), ten-point mean roughness (Rz), mean spacing of profile irregularities (Sm), mean spacing of local peaks (S), and profile bearing length ratio (tp).","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is the maximum height roughness (Ry) obtained?",{"text":117,"@type":113},"A standard length is sampled, and the distance between peaks and valleys along the measured profile is taken in the y direction. Ry is given in micrometers, and the sampling should avoid parts where peaks and valleys are wide enough to be interpreted as scratches.",{"name":119,"@type":110,"acceptedAnswer":120},"How is the ten-point mean roughness (Rz) calculated?",{"text":121,"@type":113},"A standard length is sampled and the average of the five tallest peaks (Yp) plus the average of the five lowest valleys (Yv) is used. The result is expressed in micrometers through the relation shown in the excerpt.","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},649261,1792798536,{"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":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":8,"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":81},962085564549,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","TECHNICAL DATA TECHNICAL DATA  \nSURFACE ROUGHNESS  \nExcerpt from JIS B 0601( 1994)and JIS B 0031( 1994)  \nTECHNICAL DRAWINGS  \nMETHOD OF INDICATING SURFACE TEXTURE ON DRAWINGS  \nExcerpt from JIS Z B 0031( 1994)  \n Categories of surface roughness   \nDefinitions and indications for surface roughness parameters (for industrial products) are specified. They are arithmetical mean roughness (Ra) , maximum height (Ry) , ten-point mean roughness (Rz) , mean spacing of profile irregularities (Sm) , mean spacing of local peaks of the profile (S) and profile bearing length ratio (tp) . Surface roughness is given as the arithmetical mean value for a randomly sampled area. [Mean center line roughness (Ra 75) is defined in the annexes of JIS B 0031 and JIS B 0061] .  \nTypical ways for obtaining surface roughness  \n\n| Arithmetical mean roughness (Ra)\u003Cbr>A section of standard length is sampled from the mean line on the roughness chart. The mean line is laid on a Cartesian coordinate system wherein the mean line runs in the direction of the x-axis and magnification is the y-axis.The value obtained with the formula on the right is expressed in micrometer\u003Cbr>( Om) when y = f (  ) . | Ra | |\n| --- | --- | --- |\n| Maximum peak (Ry)\u003Cbr>A section of standard length is sampled from the mean line on the roughness chart. The distance between the peaks and valleys of the sampled line is measured in the y direction. The value is expressed in micrometer ( Om) .\u003Cbr>Note : To obtain Ry, sample only the standard length. The part, where peaks and valleys are wide enough to be interpreted as scratches, should be avoided. | r\u003Cbr>\u003Cbr>Ry = Rp+Rv |  |\n| Ten-point mean roughness (Rz)\u003Cbr>A section of standard length is sampled from the mean line on the roughness chart. The distance between the peaks and valleys of the sampled line is measured in the y direction.\u003Cbr>Then, the average peak is obtained among 5 tallest peaks (Yp) , as is the average valley between 5 lowest valleys (Yv) .\u003Cbr>The sum of these two values is expressed in micrometer ( Om) . | |  |\n|  | Rz =   Yp1+Yp2+Yp3+Yp4+Yp5 + Yv1+Yv2+Yv3+Yv4+Yv5  \u003Cbr>5\u003Cbr>Yp1 , Yp2 , Yp3 , Yp4 , Yp5 : Tallest 5 peaks within sample\u003Cbr>Yv1 , Yv2 , Yv3 , Yv4 , Yv5 : Lowest 5 peaks within sample |  |\n\nReference : Relationship between arithmetical mean roughness (Ra) and conventional symbols  \n\n| Arithmetical mean roughness\u003Cbr>Ra |  |  |  | Max. height\u003Cbr>Ry | Ten-point mean roughness\u003Cbr>Rz | Standard length\u003Cbr>of Ry CRz\u003Cbr>r (mm) | Triangular\u003Cbr>indication |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n| Preferred number series |  | Cut-off value\u003Cbr> c(mm) | Indication of surface texture on drawings | Preferred number 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  | 1.6 s\u003Cbr>3.2 s\u003Cbr>6.3 s | 1.6 z\u003Cbr>3.2 z\u003Cbr>6.3 z |  | |\n| 3.2\u003Cbr>6.3 | a\u003Cbr>a | 0.25 | 3.2 ~ 6.3  | 12.5 s\u003Cbr>25 s | 12.5 z\u003Cbr>25 z | 0.25 | |\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 | 200 s\u003Cbr>400 s | 200 z\u003Cbr>400 z |  | ~ |\n|  |  | - |  |  |  | - |  |\n\nGThe interdependence for 3 classes is not strictly enforced.  \nGThe evaluation length of Ra, Ry and Rz : Five times the cut-off value standard length respectively.  \n1167 1168","cbCaicGVg6rp9Zxw","https://ap.wps.com/l/cbCaicGVg6rp9Zxw","pdf",124641,"English","# Surface Roughness - Definitions and Parameters\n## Surface roughness indicators on drawings\n## Typical ways for obtaining surface roughness\n## Reference: Ra vs conventional symbols","[{\"question\":\"What are the main surface roughness parameters defined in the excerpt?\",\"answer\":\"The excerpt defines arithmetical mean roughness (Ra), maximum height (Ry), ten-point mean roughness (Rz), mean spacing of profile irregularities (Sm), mean spacing of local peaks (S), and profile bearing length ratio (tp).\"},{\"question\":\"How is the maximum height roughness (Ry) obtained?\",\"answer\":\"A standard length is sampled, and the distance between peaks and valleys along the measured profile is taken in the y direction. Ry is given in micrometers, and the sampling should avoid parts where peaks and valleys are wide enough to be interpreted as scratches.\"},{\"question\":\"How is the ten-point mean roughness (Rz) calculated?\",\"answer\":\"A standard length is sampled and the average of the five tallest peaks (Yp) plus the average of the five lowest valleys (Yv) is used. The result is expressed in micrometers through the relation shown in the excerpt.\"}]","Surface Roughness - Method of Indicating Surface Texture on Drawings | PDF"]