ANSI B16.47 Series B Class 300 Flanges

Series B 300 Weld Neck Flange

Series B 300 Blind Flange

(Click any image above to enlarge it and lock it in place, then scroll to the bottom table for dimensions)
Thickness Drilling Weight
Nom Size OD Weld Neck Blind OD of RF Dia at Base Bore LTH Dia Bevel Bolt Circle Bolt Length HoleDia # of Holes Weld Neck Blind
O C C R X B L2 A (1) (2)
26 34.12 3.44 3.44 29 27.62 5.63 26.19 31.62 10.5 1.38 32 400 907
28 36.25 3.44 3.44 31 29.75 5.81 28.19 33.75 10.5 1.38 36 450 1023
30 39 3.63 3.63 33.25 32 6.16 30.25 36.25 11.25 1.5 36 550 1249
32 41.5 4 4 35.5 34 6.56 32.25 38.5 12 1.62 32 685 1556
34 43.62 4 4 37.5 36.12 6.75 34.25 40.62 12 1.62 36 750 1719
36 46.12 4 4 39.75 38 7.06 36.25 42.88 12.5 1.75 32 840 1921
38 48.12 4.31 4.31 41.75 40 7.50 38.25 44.88 13 1.75 36 915 2257
40 50.12 4.5 4.5 43.88 42 7.75 40.25 46.88 13.5 1.75 40 990 2549
42 52.5 4.63 4.63 46 44 8 42.31 49 14 1.88 36 1135 2876
44 54.5 4.94 4.94 48 46.19 8.38 44.31 51 14.5 1.88 40 1235 3304
46 57.5 5 5.06 50 48.38 8.69 46.31 53.75 15 2 36 1470 3766
48 59.5 5 5.25 52.25 50.31 8.75 48.31 55.75 15.25 2 40 1575 4183
50 61.5 5.38 5.44 54.25 52.38 9.19 50.31 57.75 15.75 2 44 1710 4629
52 63.5 5.56 5.61 56.25 54.44 9.5 52.31 59.75 16 2 48 1840 5096
54 65.88 5.32 5.81 58.25 56.5 9.38 54.31 62.12 16 2 48 1980 5678
56 69.5 6 6.12 60.5 58.81 10.50 56.31 65 17.75 2.38 36 2595 6642
58 71.94 6 6.31 62.75 60.94 10.75 58.31 67.44 18 2.38 40 2770 7347
60 73.94 5.88 6.5 65 62.94 10.63 60.31 69.44 18 2.38 40 2870 7980

Dimensions are in inches. Weights are in pounds.

(1)- Bolt lengths are calculated based on bolting one WN to one Blind.
(2)- Bolt diameter should be 1/8″ less than the bolt hole diameter
Note:

Larger sizes as well as intermediate sizes can be furnished.
ANSI B16.47 Series B Class 300 Flange PDF (for printing).