This granite straight edge adopts an integral casting-free forming process, with no splicing joints on the measuring surface, which completely avoids the measurement errors caused by splicing gaps. The measuring surface is precision ground and polished multiple times, reaching a surface roughness of Ra≤0.1μm, which reduces friction during the measurement process and ensures that the measuring head fits tightly with the detected surface, improving the accuracy of the measurement results. With a hardness of HRC65~70, it has excellent wear resistance, maintaining its original accuracy even after thousands of uses. Each product strictly complies with Grade 00/0/1 flatness accuracy standards, and has passed strict calibration by national metrology institutions, with traceable calibration certificates. Unlike cast iron tools, it has no magnetic properties, so it will not adsorb iron filings or other magnetic impurities, which is particularly important for precision machining workshops dealing with non-ferrous metals or electronic components. It also has good acid and alkali corrosion resistance, adapting to complex industrial environments such as mechanical processing and metal surface treatment workshops, and has a service life of more than 10 years under normal use conditions.
Overall dimension optional range: 100mm to 3000mm in length, 40mm to 120mm in width, 30mm to 80mm in thickness; Flatness accuracy: Grade 00: 0.5μm per meter, Grade 0: 1μm per meter, Grade 1: 2μm per meter; Surface roughness: Ra≤0.1μm; Hardness: HRC65~70; Load-bearing capacity: ≥200kg per linear meter; Temperature stability: 0.5μm per meter per 10℃ change; Material: Natural Jinan Blue Granite; Certifications: ISO 9001 Quality Management System, CNAS Metrology Accreditation; Packing: Wooden case with shockproof foam lining; Delivery time: 3-7 working days for standard specifications.
This precision granite straight edge is widely used in a variety of high-precision manufacturing and testing scenarios, including aerospace parts processing, automotive mold manufacturing, coordinate measuring machine calibration, machine tool installation and adjustment, PCB production line testing, and precision instrument assembly. In the aerospace industry, it is used to detect the straightness of aircraft guide rails and the alignment of fuselage assembly frames; in the automotive manufacturing sector, it is used to calibrate the positioning accuracy of fixture positioning blocks and detection platforms; in the electronics manufacturing industry, it is used to detect the flatness of PCB processing workbenches and the alignment of SMT production lines. It is an indispensable high-precision measuring tool for enterprises pursuing ultra-high-precision processing and quality control, helping to improve the consistency and accuracy of product processing.
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