Opus Metrology Ltd
EN ISO 3650:1998 Tolerances
Gauge Block Length and Variation in Length Tolerances
Nominal Length
Tolerances
Calibration Grade K
Grade 0
Grade 1
Grade 2
Over(mm)
Up to and including(mm)
Deviation of length from nominal length any point ±µm
Variation in length µm
0.5
10
0.2
0.05
0.12
0.1
0.16
0.45
0.3
25
0.14
0.6
50
0.4
0.06
0.18
0.8
75
0.25
1
0.35
100
0.07
1.2
150
0.08
1.6
200
0.09
2
250
2.4
300
1.4
0.7
2.8
400
1.8
0.9
3.6
500
2.2
1.1
4.4
600
2.6
1.3
5
700
3
1.5
6
800
3.4
1.7
6.5
900
3.8
1.9
7.5
1000
4.2
8
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