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



 
CLASS 150 TO 600 NPS 26 TO 60
NPSd1d2
Class 150Class 300Class 400Class 600
26660725772746765
28711776826800819
30762827886857879
32813881940911933
34864935994962997
36914987104810221048
3896510451099......
40101610951149......
42106711461200......
44111811971251......
46116812561318......
48121913071368......
50127013571419......
52132114081470......
54137214641530......
56142215141594......
58147315801656......
60152416301705......
NPSd1Class 150Class 300Class 400Class 600
d2
 

 

General notes:

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