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    Maryland Metrics Technical Data Chart
    Diameters & Drilling of DIN Flanges ( mm )
    Flange Nominal Diameter
    Pressure Rating (PN)
     
    **Nominal BSP Pipe Size
    PN6
    PN10
    PN16
    PN25
    PN40
     
    DN 10
    75
    90
    90
    90
    90
    O.D.
    3/8"
    50
    60
    60
    60
    60
    PCD (bolt circle)
     
    4 x 11
    4 x 14
    4 x 14
    4 x 14
    4 x 14
    # of holes x diam. of holes
    DN 15
    80
    95
    95
    95
    95
    O.D.
    1/2"
    55
    65
    65
    65
    65
    PCD (bolt circle)
     
    4 x 11
    4 x 14
    4 x 14
    4 x 14
    4 x 14
    # of holes x diam. of holes
    DN 20
    90
    105
    105
    105
    105
    O.D.
    3/4"
    65
    75
    75
    75
    75
    PCD (bolt circle)
     
    4 x 11
    4 x 14
    4 x 14
    4 x 14
    4 x 14
    # of holes x diam. of holes
    DN 25
    100
    115
    115
    115
    115
    O.D.
    1"
    75
    85
    85
    85
    85
    PCD (bolt circle)
     
    4 x 11
    4 x 14
    4 x 14
    4 x 14
    4 x 14
    # of holes x diam. of holes
    DN 32
    120
    140
    140
    140
    140
    O.D.
    1 1/4"
    90
    100
    100
    100
    100
    PCD (bolt circle)
     
    4 x 14
    4 x 18
    4 x 18
    4 x 18
    4 x 18
    # of holes x diam. of holes
    DN 40
    130
    150
    150
    150
    150
    O.D.
    1 1/2"
    100
    110
    110
    110
    110
    PCD (bolt circle)
     
    4 x 14
    4 x 18
    4 x 18
    4 x 18
    4 x 18
    # of holes x diam. of holes
    DN 50
    140
    165
    165
    165
    165
    O.D.
    2"
    110
    125
    125
    125
    125
    PCD (bolt circle)
     
    4 x 14
    4 x 18
    4 x 18
    4 x 18
    4 x 18
    # of holes x diam. of holes
    DN 65
    160
    185
    185
    185
    185
    O.D.
    2 1/2"
    130
    145
    145
    145
    145
    PCD (bolt circle)
     
    4 x 14
    4 x 18
    4 x 18
    8 x 18
    8 x 18
    # of holes x diam. of holes
    DN 80
    190
    200
    200
    200
    200
    O.D.
    3"
    150
    160
    160
    160
    160
    PCD (bolt circle)
     
    4 x 18
    8 x 18
    8 x 18
    8 x 18
    8 x 18
    # of holes x diam. of holes
    DN 100
    210
    220
    220
    235
    235
    O.D.
    4"
    170
    180
    180
    190
    190
    PCD (bolt circle)
     
    4 x 18
    8 x 18
    8 x 18
    8 x 22
    8 x 22
    # of holes x diam. of holes
    DN 125
    240
    250
    250
    270
    270
    O.D.

     




     
           
     
         
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