Dimensions for Ring Gaskets per ASME B16.21 to Suit ASME B16.5 Flanges
Nominal Pipe Size (NPS) 1/2 3/4 1 1 1 2 2 3 3 4 5 6 8 10 12 14 16 18 20 24
1/4 1/2 1/2 1/2
Nominal Pipe Size (NPS) 1/2 3/4 1 1 1 2 2 3 3 4 5 6 8 10 12 14 16 18 20 24
1/4 1/2 1/2 1/2
Class 300 Outside Diameter Inside Diameter (ID) (OD) Inches
mm
Inches
mm
0.84 1.06 1.31 1.66 1.91 2.38 2.88 3.50 4.00 4.50 5.56 6.62 8.62 10.75 12.75 14.00 16.00 18.00 20.00 24.00
21 27 33 42 49 60 73 89 102 114 141 168 219 273 324 356 406 457 508 610
2.12 2.62 2.88 3.25 3.75 4.38 5.12 5.88 6.50 7.12 8.50 9.88 12.12 14.25 16.62 19.12 21.25 23.50 25.75 30.50
54 67 73 83 95 111 130 149 165 181 216 251 308 362 422 486 540 597 654 775
Class 400 Inside Diameter Outside Diameter (ID) (OD) Inches 0.84 1.06 1.31 1.66 1.91 2.38 2.88 3.50 4.00 4.50 5.56 6.62 8.62 10.75 12.75 14.00 16.00 18.00 20.00 24.00
mm 21 27 33 42 49 60 73 89 102 114 141 168 219 273 324 356 406 457 508 610
Inches 2.12 2.62 2.88 3.25 3.75 4.38 5.12 5.88 6.38 7.00 8.38 9.75 12.00 14.12 16.50 19.00 21.12 23.38 25.50 30.25
mm 54 67 73 83 95 111 130 149 162 178 213 248 305 359 419 483 536 594 648 768
Sealing Global - Servicing Local
31