For inspecting the coaxality cylindrcity symmetry and shifting revolution parts. Opening degree 60 90 120 for V edge.

Type(mm)	flatness of working surface		Parallelism between V slot and bottom		Parallelism between V slot and side surface		Symmetry between V slot and side both surface
	Precision Grade (μm)
	0		0		0		0
40X90°	1		3		3		5
63X90°	1.5		4		4		8
100X90°	2		4		4		8
160X90°	2.5		5		5		10

Type(mm)	Squareness between side surface V slot and end surface		Squareness between V slot and bottom		Height difference of the V slot within a matched pair
	Precision Grade (μm)
	0	1	0	1	0	1
40X90°	5	5	3	6	4	6
63X90°	8	8	4	8	5	10
100X90°	8	8	4	8	5	10
160X90°	10	10	5	10	6	12

granite V-Blocks