GB/T 32.3-1988
Hexagon bolts with wire holes on head-fine pitch thread
Q 171B-1999
Hexagon bolts with wire holes on head-fine pitch thread
Q 171C-1999
Hexagon bolts with wire holes on head-fine pitch thread
Q 171B-2012
Hexagon bolts with wire holes on head-fine pitch thread
Q 171C-2012
Hexagon bolts with wire holes on head-fine pitch thread
GOST 7798-1970
Hexagon bolts with wire holes on head
GOST 7805-1970
Hexagon bolts with wire holes on head
GOST 7808-1970
Hexagon bolts with wire holes on head
GB/T 32.3-2020
Hexagon bolts with wire holes on head-fine pitch thread