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Non-Metallic Gasket Dimensions

Ball Long Pattern
NPS
d1
d2
Class 150
Class 300
Class 400
Class 600
Class 900
1/2
21
48
54
54
54
64
3/4
27
57
67
67
67
70
1
33
67
73
73
73
79
1¼
42
76
83
83
83
89
1½
48
86
95
95
95
98
2
60
105
111
111
111
143
2½
73
124
130
130
130.2
165
3
89
137
149
149
149
168
3½
102
162
165
162
162
...
4
114
175
181
178
194
206
5
141
197
216
213
241
248
6
168
222
251
248
267
289
8
219
279
308
305
321
359
10
273
340
362
359
400
435
12
324
410
422
419
457
498
14
356
451
486
483
492
521
16
406
514
540
537
565
575
18
457
549
597
594
613
638
20
508
606
654
648
683
699
24
610
718
775
768
791
838
NPS
d1
Class 150
Class 300
Class 400
Class 600
Class 900
d2

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

General notes:

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

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