Equal to major dia
Equal to minor dia
0.05 mm over size of major dia
0.05 mm under size of major dia
Grade I accuracy
Grade 'O' accuracy
Grade 'OO' accuracy
Grade 2 accuracy
High graded steel
High carbon steel
Low graded steel
Tool steel
5
4
2
3
Grade '0' accuracy
Grade 1 accuracy
Grade 00 accuracy
