For the same specification: (\\boldsymbol{Grade 000 < Grade 00 < Grade 0})
Small squares (e.g., 200\u00d7200mm):
Grade 000: \u22641.5 \u03bcm
Grade 00: \u22642.5 \u03bcm
Grade 0: \u22644.0 \u03bcm
Medium squares (e.g., 400\u00d7400mm):
Grade 000: \u22643.0 \u03bcm
Grade 00: \u22645.0 \u03bcm
Grade 0: \u22648.0 \u03bcm<\/li>\n\n\n\n
Similarly follows the rule that the higher the grade, the smaller the tolerance, which is the basis for ensuring fitting measurement.
200\u00d7200mm:
Grade 000: \u22641.0 \u03bcm
Grade 00: \u22641.8 \u03bcm
Grade 0: \u22643.0 \u03bcm<\/li>\n\n\n\n
Parallelism error of opposite sides, the limit rule is the same as above, used to control the overall geometric accuracy.<\/li>\n<\/ol>\n\n\n\n
III. Supplementary Notes Granite Precision Square Accuracy Grade Classification Domestic Executive Standard: JB\/T 10027-2017 “Granite Surface Plates, Straight Edges, and Squares”, classified by working surface flatness, squareness accuracy, and parallelism, divided into three grades: 000, 00, and 0. The smaller the grade number, the higher the accuracy. I. Grade Positioning (Application Scenarios)Grade 000 (Reference Grade)Highest accuracy, limited to…<\/p>","protected":false},"author":1,"featured_media":1294,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_analysis_target_kw":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-2939","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"taxonomy_info":{"category":[{"value":35,"label":"NEWS"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/01\/\u65b9\u5c3a4.jpg",400,300,false],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/es\/author\/jtlcnc\/"},"comment_info":0,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":246,"filter":"raw","cat_ID":35,"category_count":246,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts\/2939","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/comments?post=2939"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts\/2939\/revisions"}],"predecessor-version":[{"id":2940,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/posts\/2939\/revisions\/2940"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/media\/1294"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/media?parent=2939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/categories?post=2939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/tags?post=2939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Dimension Segments
The standard divides squares into multiple dimension segments based on the outer side length (200, 250, 300, 400, 500, 630mm, etc.). The larger the dimension, the larger the allowable tolerance.
International Benchmarking
Domestic Grade 000 \u2248 International Grade AA, Grade 00 \u2248 Grade A, Grade 0 \u2248 Grade B.
Usage Differentiation
Grade 000 is mandatory for metrological traceability; Grade 00 is selected for precision machining \/ laboratory quality inspection; Grade 0 can be directly used for on-site production inspection.<\/p>\n\n\n\n![\"\"](\"https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/01\/\u65b9\u5c3a4.jpg\")
<\/figure>","protected":false},"excerpt":{"rendered":"