球墨鑄鐵管法蘭螺栓螺紋規(guī)格
規(guī)格DN
mm
PN10
PN16
PN25
10
M12
15
20
25
32
M16
40
50
65
80
100
M20
125
M24
150
200
250
M27
300
350
M30
400
M33
450
500
600
M36
700
M39
800
M45
900
1000
M52
1200
1400
M56
1600
1800
M64
2000
