Selected Jinan Blue Fine-grained Granite, specifically chosen for measurement base materials:
\nExtremely stable dimensions, extremely low thermal expansion
\nLinear expansion coefficient is only 4.7\u00d710\u207b\u2076\/\u2103, with minimal deformation from temperature differences; cast iron is prone to thermal expansion\/contraction and aging deformation, leading to long-term accuracy decline.
\nNon-magnetic, does not attract iron filings
\nNo magnetic field interference for CMM and optical inspection, preventing magnetic attraction offset between workpieces and measuring tools.
\nStrong vibration damping
\nNatural damping from the internal crystal structure, workshop vibrations are not easily transmitted, resulting in better measurement data repeatability.
\nWear-resistant, corrosion-resistant, and never rusts
\nMohs hardness of 7, ensuring cutting tools and workpieces do not scratch the reference surface; no corrosion or rust spots even after long-term immersion in cutting fluids, weak acids, or weak alkalis.
\nNo internal stress, long-lasting accuracy
\nThe ore has undergone natural aging for millions of years, and stress is released through constant temperature aging after machining, with micron-level flatness changes over ten years; cast iron is prone to creep deformation.
\nWater absorption rate <0.13%\nDense and without capillary pores, liquids do not penetrate, and it will not swell due to moisture.\nBasic physical parameters\nDensity: 2.65~2.7t\/m\u00b3\nShore hardness: \u226570HS\nCompressive strength: \u2265245MPa\nWorking surface roughness: Ra\u22640.2\u03bcm (mirror-finished)\n<\/p>","protected":false},"excerpt":{"rendered":"
II. Detailed Explanation of Accuracy Grades (Grade 00 Core)
\nFlatness Tolerance Formula: Tolerance \u03bcm = K\u00d7(1 d\/1000)
\nd = Platform diagonal mm, inspection constant temperature 20\u00b12\u2103
\nGrade\tCoefficient K\tAccuracy Level\tApplication Scenarios
\nGrade 000\t1\tUltra-precision metrology grade\tMetrology institutes, semiconductor lithography, optical laboratories, ultra-high precision CMM bases
\nGrade 00\t2\tMainstream precision industrial\tEnterprise metrology rooms, mold verification, precision part inspection, CMM reference bases, measuring tool calibration
\nGrade 0\t4\tWorkshop precision inspection\tMachining quality inspection, tooling verification, conventional precision assembly
\nGrade 1\t8\tOrdinary marking table\tRough machining marking, simple inspection of ordinary parts<\/p>\n
III. Standard Specifications and Custom Irregular Shapes
\n1. Regular Standard Plates (Grade 00 In-stock)
\n300\u00d7200, 400\u00d7400, 630\u00d7400, 800\u00d7500, 1000\u00d7630, 1200\u00d7800, 1500\u00d71000, 2000\u00d71500mm
\nThickness: Small 50\/70mm, Medium 100\/130mm, Large \u2265200mm (to ensure rigidity and prevent sagging)
\n2. Custom Irregular Shapes with Full Process (Machined to Order)
\nFunctional Slot Machining
\nT-slots, parallel slots, cross slots, recessed slots, drainage slots, fixture positioning slots, with Grade 00 perpendicularity of slot walls guaranteed simultaneously
\nHole Machining
\nThrough holes, countersunk holes, threaded holes (pre-embedded stainless steel threaded sleeves to prevent stripping), locating pin holes, mounting foot holes
\nIrregular External Shapes
\nL-shape, U-shape, stepped surfaces, multi-step, cantilever platforms, circular \/ fan-shaped, machine tool beds, linear guide bases, CMM machine bases
\nEmbedded Accessories
\nPre-embedded steel sleeves, locating pins, anti-collision metal edging, lifting threads, adjustable support mounting positions
\nCombined Components
\nGranite square, square box, V-blocks, guide rail bases, optical tables, air-float bases<\/p>","protected":false},"featured_media":2862,"template":"","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_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":"default","_kad_post_title":"","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":""},"product_brand":[],"product_cat":[45],"product_tag":[],"class_list":["post-3103","product","type-product","status-publish","has-post-thumbnail","product_cat-base","first","instock","shipping-taxable","product-type-simple","entry","content-bg","loop-entry"],"taxonomy_info":{"product_cat":[{"value":45,"label":"Granite equipment base"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/06\/20260602-084707-1.png",800,400,false],"author_info":[],"comment_info":"","_links":{"self":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/product\/3103","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/media\/2862"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/media?parent=3103"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/product_brand?post=3103"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/product_cat?post=3103"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/es\/wp-json\/wp\/v2\/product_tag?post=3103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}