Dimensions of Non-Metallic Flat Gaskets ASME B16.21 to be used with Raised Face flanges ASME B16.47 series B

Non-metallic flat gasket
bg_gasket_fl_a

Class 150 to 600NPS 26 to 60
NPS d1 d2
Class 150 Class 300 Class 400 Class 600
26 660 725 772 746 765
28 711 776 826 800 819
30 762 827 886 857 879
32 813 881 940 911 933
34 864 935 994 962 997
36 914 987 1048 1022 1048
38 965 1045 1099
40 1016 1095 1149
42 1067 1146 1200
44 1118 1197 1251
46 1168 1256 1318
48 1219 1307 1368
50 1270 1357 1419
52 1321 1408 1470
54 1372 1464 1530
56 1422 1514 1594
58 1473 1580 1656
60 1524 1630 1705
NPS d1 Class 150 Class 300 Class 400 Class 600
d2

General notes:

  • Dimensions are in millimeters unless otherwise indicated.
  • d1 = Inside diameter.
  • d2 = Outside diameter.
  • Dimensional tolerances outside diameter: +0 / -3.0 mm.
  • Dimensional tolerances inside diameter: ± 3.0 mm.
  • Thickness (t) specified by customer.