ISO 4206:1991被替代
Counterbores with parallel shanks and solid pilots
出版：International Organization for Standardization
专家解读视频
GB/T 4260-2004 - Modified
KS B 3503:2002 - Modified
DIN 373 (1975-08) - Identical
JIS B 4256:1999 - Identical
BS 328-7:1992 - Equivalent
NF ISO 4206:1992 - Identical
DIN 373 (2007-12) - Identical
BS 328-5:1983 - Identical
