Language
GB /T 1972 (A) - 2005
D
GB /T 1972 (B) - 2005
GB /T 1972 (C) - 2005
GB /T 1972 (A) - 1992
GB /T 1972 (B) - 1992
GB /T 1972 (C) - 1992
DIN 2093 (C) - 2013
DIN 9025 (S)
DIN EN 16983 (C) - 2017
ASME/ANSI B 18.21.1 - 2009
UNI 9319 - 1994
BS 4464 - 1969
ASME B 18.21.3 - 2008 (R2013)