方尺

JB/T0027-1999

用于垂直度、平行度检查，并可为90°绝对测量基准。

On inspection of verticality and parallelism as well as absolute 90° measuring base.

花岗石方尺精度等级Graite square rulers：

编号
No 		规格
Dimension
mm 		相邻两侧面的垂直度
Flatness and
beeline of the
measuring surface
(μm) 		测量面的平面度和直线度
Parallelism of the two measuring surface(μm) 		相对测量面的平行度
Perpendicularity between measuring surfaces and side surface (μm) 		两侧面对测量面的垂直度
height difference of the paralells within a matched pair(μm)
精度00
Grade00 		精度0
Grade0 		精度00
Grade00 		精度0
Grade0 		精度00
Grade00 		精度0
Grade0 		精度00
Grade00 		精度0
Grade0
108-2101
108-2102
108-2103
108-2104
108-2105
108-2106
108-2107
108-2108 		100×100×20
160×160×25
200×200×25
250×250×30
300×300×30
400×400×40
500×500×50
630×630×60 		1.5
1.8
2.0
2.2
2.6
3.0
3.5
4.2 		3.0
3.5
4.0
4.5
5.2
6.0
7.0
8.3 		0.7
0.8
0.9
1.0
1.1
1.3
1.5
1.8 		1.4
1.6
1.8
2.0
2.3
2.6
3.0
3.5 		1.5
1.5
2.0
2.2
2.6
3.0
3.5
4.2 		3.0
3.5
4.0
4.5
5.5
6.0
7.0
8.3 		15
18
20
22
26
30
35
42 		30
35
40
45
52
60
70
83