All dimensions are in "mm" unless noted otherwise.

Dimensions of Class 2500 RF Blind Flanges as per ASME B16.5.

Blind Flange

Nominal
Pipe Size
OD of
Flange
(D)
Thickness
of Flange
(B)
Dia of
Raised Face
(G)
No of
Bolt
Holes
Dia of
Bolt Holes
(L)
Dia of
Bolt
(inches)
Dia of
Bolt Circle
(K)
Approx
Weight
(kg)
1/2 133.4 30.2 35.1 4 22.4 3/4 88.9 3
3/4 139.7 31.8 42.9 4 22.4 3/4 95.3 4
1 158.8 35.1 50.8 4 25.4 7/8 108 5
1-1/4 184.2 38.1 63.5 4 28.4 1 130 8
1-1/2 203.2 44.5 73.2 4 31.8 1-1/8 146.1 10
2 235 50.8 91.9 8 28.4 1 171.5 18
2-1/2 266.7 57.2 104.6 8 31.8 1-1/8 196.9 25
3 304.8 66.5 127 8 35.1 1-1/4 228.6 39
4 355.6 76.2 157.2 8 41.1 1-1/2 273.1 61
5 419.1 91.9 185.7 8 47.8 1-3/4 323.9 102
6 482.6 108 215.9 8 53.8 2 368.3 156
8 552.5 127 269.7 12 53.8 2 438.2 240
10 673.1 165.1 323.9 12 66.5 2-1/2 539.8 465
12 762 184.2 381 12 73.2 2-3/4 619.3 590