I.S. EN 20273:1992现行
Fasteners - Clearance Holes for Bolts and Screws (iso 273:1979)
出版：National Standards Authority of Ireland
专家解读视频
Defines clearance hole diameters for general purpose applications.
UNE EN 20273:1992 - Identical
SS EN 20273 Ed. 1 (1992) - Identical
ISO 273:1979 - Identical
UNI EN 20273:1992 - Identical
NF EN 20273:1992 - Identical
NBN EN 20273:1992 - Identical
BS EN 20273:1992 - Identical
DIN EN 20273 (1992-02) - Identical
ONORM EN 20273:1992 - Identical
