Granite square - Jingda Tools Of China

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Type (mm)	Squareness between adjacent measuring surfaces		Straightness of measuring surface		Parallelism between Opposite measuring surfaces
	Precision grade (μm)
	00	0	00	0	00	0
160 × 160	2	4	0.8	1.7	2	4
200 × 200	2	4	0.9	1.8	2	4
250 × 250	2.2	4.5	1	2	2.2	4.5
300 × 300	2.6	5.2	1.1	2.3	2.6	5.5
400 × 400	3	6	1.3	2.6	3	6
500 × 500	3.5	7	1.5	3	3.5	7