Dimensions of Non-Metallic Flat Gaskets for ASME/ANSI B16.5 & B16.47 Pipe Flanges
Non-metallic flanges are typically recommended for Class 150 and 300 flanges
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| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 0.5 | 0.84 | 4.75 | 4 | 0.88 | 3.25 |
| 0.75 | 1.06 | 5.12 | 4 | 0.88 | 3.5 |
| 1 | 1.31 | 5.88 | 4 | 1 | 4 |
| 1.25 | 1.66 | 6.25 | 4 | 1 | 4.38 |
| 1.5 | 1.91 | 7 | 4 | 1.12 | 4.88 |
| 2 | 2.38 | 8.5 | 8 | 1 | 6.5 |
| 2.5 | 2.88 | 9.62 | 8 | 1.12 | 7.5 |
| 3 | 3.5 | 9.5 | 8 | 1 | 7.5 |
| 4 | 4.5 | 11.5 | 8 | 1.25 | 9.25 |
| 5 | 5.56 | 13.75 | 8 | 1.38 | 11 |
| 6 | 6.62 | 15 | 12 | 1.25 | 12.5 |
| 8 | 8.62 | 18.5 | 12 | 1.5 | 15.5 |
| 10 | 10.75 | 21.5 | 16 | 1.5 | 18.5 |
| 12 | 12.75 | 24 | 20 | 1.5 | 21 |
| 14 | 14 | 25.25 | 20 | 1.62 | 22 |
| 16 | 16 | 27.75 | 20 | 1.75 | 24.25 |
| 18 | 18 | 31 | 20 | 2 | 27 |
| 20 | 20 | 33.75 | 20 | 2.12 | 29.5 |
| 24 | 24 | 41 | 20 | 2.62 | 35.5 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 42.75 | 20 | 2.88 | 37.5 |
| 28 | 28 | 46 | 20 | 3.12 | 40.25 |
| 30 | 30 | 48.5 | 20 | 3.12 | 42.75 |
| 32 | 32 | 51.75 | 20 | 3.38 | 45.5 |
| 34 | 34 | 55 | 20 | 3.62 | 48.25 |
| 36 | 36 | 57.5 | 20 | 3.62 | 50.75 |
| 38 | 38 | 57.5 | 20 | 3.62 | 50.75 |
| 40 | 40 | 59.5 | 24 | 3.62 | 52.75 |
| 42 | 42 | 61.5 | 24 | 3.62 | 54.75 |
| 44 | 44 | 64.88 | 24 | 3.88 | 57.62 |
| 46 | 46 | 68.25 | 24 | 4.12 | 60.5 |
| 48 | 48 | 70.25 | 24 | 4.12 | 62.5 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 40.25 | 20 | 2.62 | 35.5 |
| 28 | 28 | 43.5 | 20 | 2.88 | 38.25 |
| 30 | 30 | 46.5 | 20 | 3.12 | 40.75 |
| 32 | 32 | 48.75 | 20 | 3.12 | 43 |
| 34 | 34 | 51.75 | 20 | 3.38 | 45.5 |
| 36 | 36 | 53 | 24 | 3.12 | 47.25 |
| 38 | 38 | 57.5 | 20 | 3.62 | 50.75 |
| 40 | 40 | 59.5 | 24 | 3.62 | 52.75 |
| 42 | 42 | 61.5 | 24 | 3.62 | 54.75 |
| 44 | 44 | 64.88 | 24 | 3.88 | 57.62 |
| 46 | 46 | 68.25 | 24 | 4.12 | 60.5 |
| 48 | 48 | 70.25 | 24 | 4.12 | 62.5 |
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 B16.5 – Pipe flanges and flanged fittings: NPS 1/2 through 24
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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