Dimensions of Non-Metallic Flat Gaskets As Per ASME B16.21

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Dimensions of Non-Metallic Flat Gaskets ASME B16.21 to be used with Raised Face flanges ASME B16.5

Non Metallic Gasket Dimensions

CLASS 150 TO 900    Size  1/2″  TO 24″

NPSd1d2
150#300#400#600#900#
1/2214854545464
3/4275767676770
1336773737379
1-1/4427683838389
1-1/2488695959598
260105111111111143
2-1/273124130130130.2165
389137149149149168
3-1/2102162165162162...
4114175181178194206
5141197216213241248
6168222251248267289
8219279308305321359
10273340362359400435
12324410422419457498
14356451486483492521
16406514540537565575
18457549597594613638
20508606654648683699
24610718775768791838

General notes:

  1. Dimensions are in millimeters unless otherwise indicated.
  2. d1 = Inside diameter.
  3. d2 = Outside diameter.
  4. Dimensional tolerances outside diameter NPS 12 and smaller: +0 / -1.5 mm.
  5. Dimensional tolerances outside diameter NPS 14 and larger: +0 / -3.0 mm.
  6. Dimensional tolerances inside diameter NPS 12 and smaller: ± 1.5 mm.
  7. Dimensional tolerances inside diameter NPS 14 and larger: ± 3.0 mm.
  8. Thickness (t) specified by customer.

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