Tpye (mm)	Flatness of working surface and Parallelism of opposite surfaces		Squareness between Working surfaces		Tolerance of H. w. Between A matched pair
	Precision grade ( μm)
	00	0	00	0	00	0
160 × 25 × 16	1. 5	3	20	40	1. 5	3
250 × 40 × 25	2	4	30	60	2	4
400 × 63 × 40	4	8	40	80	4	8
630 × 100 × 63	6	12	50	100	6	12