Dimension of Flat Ring Gaskets up to 24 inches

Expired

Dimensions of Class 150 to Class 900 Flat Ring Gaskets to ASME B16.21 for use with ASME B16.5 RF Flanges.

Flat Ring Gasket Dimensions

Nominal Pipe Size Inside Diameter
(mm)		 Outside Diameter
(mm)
DN Inch Class 150 Class 300 Class 400 Class 600 Class 900
15 1/2 21 48 54 54 54 64
20 3/4 27 57 67 67 67 70
25 1 33 67 73 73 73 79
32 1-1/4 42 76 83 83 83 89
40 1-1/2 48 86 95 95 95 98
50 2 60 105 111 111 111 143
65 2-1/2 73 124 130 130 130 165
80 3 89 137 149 149 149 168
90 3-1/2 102 162 165 162 162 -
100 4 114 175 181 178 194 206
125 5 141 197 216 213 241 248
150 6 168 222 251 248 267 289
200 8 219 279 308 305 321 359
250 10 273 340 362 359 400 435
300 12 324 410 422 419 457 498
350 14 356 451 486 483 492 521
400 16 406 514 540 537 565 575
450 18 457 549 597 594 613 638
500 20 508 606 654 648 683 699
600 24 610 718 775 768 791 838
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