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

Dimensions of Non-Metallic Flat Gaskets
NPS 26 - 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    

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.
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