A.0.4~20MPa B.0.6~20.0MPa C.0.4~16.0MPa D.0.6~16MPa
A.20±0.01mm B.20±0.02mm C.20±0.03mm D.20±0.04mm
A.20±0.6mm B.20±0.8mm C.20±0.10mm D.20±0.12mm