Dimensions of Non-Metallic Flat Gaskets for ASME/ANSI B16.5 & B16.47 Pipe Flanges
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
| 26 | 26 | 30.94 | 36 | 0.88 | 29.31 |
| 28 | 28 | 32.94 | 40 | 0.88 | 31.31 |
| 30 | 30 | 34.94 | 44 | 0.88 | 33.31 |
| 32 | 32 | 37.06 | 48 | 0.88 | 35.44 |
| 34 | 34 | 39.56 | 40 | 1 | 37.69 |
| 36 | 36 | 41.62 | 44 | 1 | 39.75 |
| 38 | 38 | 44.25 | 40 | 1.12 | 42.12 |
| 40 | 40 | 46.25 | 44 | 1.12 | 44.12 |
| 42 | 42 | 48.25 | 48 | 1.12 | 46.12 |
| 44 | 44 | 50.25 | 52 | 1.12 | 48.12 |
| 46 | 46 | 52.81 | 40 | 1.25 | 50.56 |
| 48 | 48 | 54.81 | 44 | 1.25 | 52.56 |
| 50 | 50 | 56.81 | 48 | 1.25 | 54.56 |
| 52 | 52 | 58.81 | 52 | 1.25 | 56.56 |
| 54 | 54 | 61 | 56 | 1.25 | 58.75 |
| 56 | 56 | 63 | 60 | 1.25 | 60.75 |
| 58 | 58 | 65.94 | 48 | 1.38 | 63.44 |
| 60 | 60 | 67.94 | 52 | 1.38 | 65.44 |
NPS = Nominal Pipe Size
ID = Inner Diameter
OD = Outer Diameter
BCD = Bolt Circle Diameter
General Note:
All dimensions are in inches.
Larger sizes as well as customized sizes can be furnished.
Bolt diameter should be 1/8″ less than the bolt hole size.
Standards:
ASME B16.21 – Non-metallic flat gaskets for pipe flanges
ASME B16.47 – Large diameter steel flanges: NPS 26 through NPS 60 standard
No liability or guarantee for the correctness and completeness of the information provided
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