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ASME B16.47 Large Diameter Flanges, Series A

  ASME B16.47 Series A Flanges
  Pipe Size Number
of Bolts		 Diameter
of Bolts		 Length
of Bolts
Class 150 26 24 1 1/4 8 3/4
28 28 1 1/4 9
30 28 1 1/4 9 1/4
32 28 1 1/2 10 1/2
34 32 1 1/2 10 1/2
36 32 1 1/2 11 1/4
38 32 1 1/2 11
40 36 1 1/2 11 1/4
42 36 1 1/2 11 3/4
44 40 1 1/2 12
46 40 1 1/2 12 1/4
48 44 1 1/2 12 3/4
50 44 1 3/4 13 1/2
52 44 1 3/4 13 3/4
54 44 1 3/4 14 1/4
56 48 1 3/4 14 1/2
58 48 1 3/4 14 3/4
60 52 1 3/4 15
Class 300 26 28 1 5/8 10 1/2
28 28 1 5/8 11
30 28 1 3/4 11 3/4
32 28 1 7/8 12 3/4
34 28 1 7/8 13
36 32 2 13 1/2
38 32 1 1/2 12 3/4
40 32 1 5/8 13 1/2
42 32 1 5/8 13 3/4
44 32 1 3/4 14 1/2
46 28 1 7/8 15
48 32 1 7/8 15 1/2
50 32 2 16 1/4
52 32 2 16 1/2
54 28 2 1/4 17 3/4
56 28 2 1/4 17 3/4
58 32 2 1/4 18 1/4
60 32 2 1/4 18 3/4
Class 400 26 28 1 3/4 12
28 28 1 7/8 13
30 28 2 13 1/2
32 28 2 14
34 28 2 14 1/4
36 32 2 14 1/2
38 32 1 3/4 15
40 32 1 7/8 15 1/2
42 32 1 7/8 16
44 32 2 16 1/2
46 36 2 17
48 28 2 1/4 18 1/4
50 32 2 1/4 18 3/4
52 32 2 1/4 19
54 28 2 1/2 20 1/4
56 32 2 1/2 20 1/2
58 32 2 1/2 20 3/4
60 32 2 3/4 22
Class 600 26 28 1 7/8 14
28 28 2 14 1/2
30 28 2 14 1/2
32 28 2 1/4 15 1/2
34 28 2 1/4 15 3/4
36 28 2 1/2 16 1/2
38 28 2 1/4 18 1/4
40 32 2 1/4 18 3/4
42 28 2 1/2 20
44 32 2 1/2 20 1/4
46 32 2 1/2 20 3/4
48 32 2 3/4 22 1/4
50 28 3 23 3/4
52 32 3 23 3/4
54 32 3 24 1/4
56 32 3 1/4 25 1/2
58 32 3 1/4 25 3/4
60 28 3 1/2 27 1/4
Class 900 26 20 2 3/4 18 1/4
28 20 3 19
30 20 3 19 1/2
32 20 3 1/4 20 1/2
34 20 3 1/2 21 3/4
36 20 3 1/2 22 1/4
38 20 3 1/2 23 3/4
40 24 3 1/2 24 1/4
42 24 3 1/2 25
44 24 3 3/4 26 1/4
46 24 4 27 1/2
48 24 4 28 1/4