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 | 3.75 | 4 | 0.63 | 2.62 |
| 0.75 | 1.06 | 4.62 | 4 | 0.75 | 3.25 |
| 1 | 1.31 | 4.88 | 4 | 0.75 | 3.5 |
| 1.25 | 1.66 | 5.25 | 4 | 0.75 | 3.88 |
| 1.5 | 1.91 | 6.12 | 4 | 0.88 | 4.5 |
| 2 | 2.38 | 6.5 | 8 | 0.75 | 5 |
| 2.5 | 2.88 | 7.5 | 8 | 0.88 | 5.88 |
| 3 | 3.5 | 8.25 | 8 | 0.88 | 6.62 |
| 3.5 | 4 | 9 | 8 | 1 | 7.25 |
| 4 | 4.5 | 10 | 8 | 1 | 7.88 |
| 5 | 5.56 | 11 | 8 | 1 | 9.25 |
| 6 | 6.62 | 12.5 | 12 | 1 | 10.62 |
| 8 | 8.62 | 15 | 12 | 1.12 | 13 |
| 10 | 10.75 | 17.5 | 16 | 1.25 | 15.25 |
| 12 | 12.75 | 20.5 | 16 | 1.38 | 17.75 |
| 14 | 14 | 23 | 20 | 1.38 | 20.25 |
| 16 | 16 | 25.5 | 20 | 1.5 | 22.5 |
| 18 | 18 | 28 | 24 | 1.5 | 24.75 |
| 20 | 20 | 30.5 | 24 | 1.62 | 27 |
| 24 | 24 | 36 | 24 | 1.88 | 32 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 38.25 | 28 | 1.88 | 34.5 |
| 28 | 28 | 40.75 | 28 | 2 | 37 |
| 30 | 30 | 43 | 28 | 2.12 | 39.25 |
| 32 | 32 | 45.25 | 28 | 2.12 | 41.5 |
| 34 | 34 | 47.5 | 28 | 2.12 | 43.5 |
| 36 | 36 | 50 | 32 | 2.12 | 46 |
| 38 | 38 | 47.5 | 32 | 1.88 | 44 |
| 40 | 40 | 50 | 32 | 2 | 46.25 |
| 42 | 42 | 52 | 32 | 2 | 48.25 |
| 44 | 44 | 54.5 | 32 | 2.12 | 50.5 |
| 46 | 46 | 56.75 | 36 | 2.12 | 52.75 |
| 48 | 48 | 59.5 | 28 | 2.38 | 55.25 |
| 50 | 50 | 61.75 | 32 | 2.38 | 57.5 |
| 52 | 52 | 63.75 | 32 | 2.38 | 59.5 |
| 54 | 54 | 67 | 28 | 2.62 | 62.25 |
| 56 | 56 | 69 | 32 | 2.62 | 64.25 |
| 58 | 58 | 71 | 32 | 2.62 | 66.25 |
| 60 | 60 | 74.25 | 32 | 2.88 | 69 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 33.5 | 28 | 1.5 | 30.75 |
| 28 | 28 | 36 | 24 | 1.62 | 33 |
| 30 | 30 | 38.25 | 28 | 1.62 | 35.25 |
| 32 | 32 | 40.75 | 28 | 1.75 | 37.5 |
| 34 | 34 | 42.75 | 32 | 1.75 | 39.5 |
| 36 | 36 | 45.5 | 28 | 1.88 | 42 |
| 38 | 38 | 47.5 | 32 | 1.88 | 44 |
| 40 | 40 | 50 | 32 | 2 | 46.25 |
| 42 | 42 | 52 | 32 | 2 | 48.25 |
| 44 | 44 | 54.5 | 32 | 2.12 | 50.5 |
| 46 | 46 | 56.75 | 36 | 2.12 | 52.75 |
| 48 | 48 | 59.5 | 28 | 2.38 | 55.25 |
| 50 | 50 | 61.75 | 32 | 2.38 | 57.5 |
| 52 | 52 | 63.75 | 32 | 2.38 | 59.5 |
| 54 | 54 | 67 | 28 | 2.62 | 62.25 |
| 56 | 56 | 69 | 32 | 2.62 | 64.25 |
| 58 | 58 | 71 | 32 | 2.62 | 66.25 |
| 60 | 60 | 74.25 | 32 | 2.88 | 69 |
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 B16.5 – 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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