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 | 10.75 | 8 | 1 | 8.5 |
| 5 | 5.56 | 13 | 8 | 1.12 | 10.5 |
| 6 | 6.62 | 14 | 12 | 1.12 | 11.5 |
| 8 | 8.62 | 16.5 | 12 | 1.25 | 13.75 |
| 10 | 10.75 | 20 | 16 | 1.38 | 17 |
| 12 | 12.75 | 22 | 20 | 1.38 | 19.25 |
| 14 | 14 | 23.75 | 20 | 1.5 | 20.75 |
| 16 | 16 | 27 | 20 | 1.62 | 23.75 |
| 18 | 18 | 29.25 | 20 | 1.75 | 25.75 |
| 20 | 20 | 32 | 24 | 1.75 | 28.5 |
| 24 | 24 | 37 | 24 | 2 | 33 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 40 | 28 | 2 | 36 |
| 28 | 28 | 42.25 | 28 | 2.12 | 38 |
| 30 | 30 | 44.5 | 28 | 2.12 | 40.25 |
| 32 | 32 | 47 | 28 | 2.38 | 42.5 |
| 34 | 34 | 49 | 28 | 2.38 | 44.5 |
| 36 | 36 | 51.75 | 28 | 2.62 | 47 |
| 38 | 38 | 50 | 28 | 2.38 | 45.75 |
| 40 | 40 | 52 | 32 | 2.38 | 47.75 |
| 42 | 42 | 55.25 | 28 | 2.62 | 50.5 |
| 44 | 44 | 57.25 | 32 | 2.62 | 52.5 |
| 46 | 46 | 59.5 | 32 | 2.62 | 54.75 |
| 48 | 48 | 62.75 | 32 | 2.88 | 57.5 |
| 50 | 50 | 65.75 | 28 | 3.12 | 60 |
| 52 | 52 | 67.75 | 32 | 3.12 | 62 |
| 54 | 54 | 70 | 32 | 3.12 | 64.25 |
| 56 | 56 | 73 | 32 | 3.38 | 66.75 |
| 58 | 58 | 75 | 32 | 3.38 | 68.75 |
| 60 | 60 | 78.5 | 28 | 3.62 | 71.75 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 35 | 28 | 1.75 | 31.75 |
| 28 | 28 | 37.5 | 28 | 1.88 | 34 |
| 30 | 30 | 40.25 | 28 | 2 | 36.5 |
| 32 | 32 | 42.75 | 28 | 2.12 | 38.75 |
| 34 | 34 | 45.75 | 24 | 2.38 | 41.5 |
| 36 | 36 | 47.75 | 28 | 2.38 | 43.5 |
| 38 | 38 | 50 | 28 | 2.38 | 45.75 |
| 40 | 40 | 52 | 32 | 2.38 | 47.75 |
| 42 | 42 | 55.25 | 28 | 2.62 | 50.5 |
| 44 | 44 | 57.25 | 32 | 2.62 | 52.5 |
| 46 | 46 | 59.5 | 32 | 2.62 | 54.75 |
| 48 | 48 | 62.75 | 32 | 2.88 | 57.5 |
| 50 | 50 | 65.75 | 28 | 3.12 | 60 |
| 52 | 52 | 67.75 | 32 | 3.12 | 62 |
| 54 | 54 | 70 | 32 | 3.12 | 64.25 |
| 56 | 56 | 73 | 32 | 3.38 | 66.75 |
| 58 | 58 | 75 | 32 | 3.38 | 68.75 |
| 60 | 60 | 78.5 | 28 | 3.62 | 71.75 |
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
| 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 | 10.75 | 8 | 1 | 8.5 |
| 5 | 5.56 | 13 | 8 | 1.12 | 10.5 |
| 6 | 6.62 | 14 | 12 | 1.12 | 11.5 |
| 8 | 8.62 | 16.5 | 12 | 1.25 | 13.75 |
| 10 | 10.75 | 20 | 16 | 1.38 | 17 |
| 12 | 12.75 | 22 | 20 | 1.38 | 19.25 |
| 14 | 14 | 23.75 | 20 | 1.5 | 20.75 |
| 16 | 16 | 27 | 20 | 1.62 | 23.75 |
| 18 | 18 | 29.25 | 20 | 1.75 | 25.75 |
| 20 | 20 | 32 | 24 | 1.75 | 28.5 |
| 24 | 24 | 37 | 24 | 2 | 33 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 40 | 28 | 2 | 36 |
| 28 | 28 | 42.25 | 28 | 2.12 | 38 |
| 30 | 30 | 44.5 | 28 | 2.12 | 40.25 |
| 32 | 32 | 47 | 28 | 2.38 | 42.5 |
| 34 | 34 | 49 | 28 | 2.38 | 44.5 |
| 36 | 36 | 51.75 | 28 | 2.62 | 47 |
| 38 | 38 | 50 | 28 | 2.38 | 45.75 |
| 40 | 40 | 52 | 32 | 2.38 | 47.75 |
| 42 | 42 | 55.25 | 28 | 2.62 | 50.5 |
| 44 | 44 | 57.25 | 32 | 2.62 | 52.5 |
| 46 | 46 | 59.5 | 32 | 2.62 | 54.75 |
| 48 | 48 | 62.75 | 32 | 2.88 | 57.5 |
| 50 | 50 | 65.75 | 28 | 3.12 | 60 |
| 52 | 52 | 67.75 | 32 | 3.12 | 62 |
| 54 | 54 | 70 | 32 | 3.12 | 64.25 |
| 56 | 56 | 73 | 32 | 3.38 | 66.75 |
| 58 | 58 | 75 | 32 | 3.38 | 68.75 |
| 60 | 60 | 78.5 | 28 | 3.62 | 71.75 |
| NPS | ID | OD | Hole Qty | Hole Size | BCD |
|---|---|---|---|---|---|
| 26 | 26 | 35 | 28 | 1.75 | 31.75 |
| 28 | 28 | 37.5 | 28 | 1.88 | 34 |
| 30 | 30 | 40.25 | 28 | 2 | 36.5 |
| 32 | 32 | 42.75 | 28 | 2.12 | 38.75 |
| 34 | 34 | 45.75 | 24 | 2.38 | 41.5 |
| 36 | 36 | 47.75 | 28 | 2.38 | 43.5 |
| 38 | 38 | 50 | 28 | 2.38 | 45.75 |
| 40 | 40 | 52 | 32 | 2.38 | 47.75 |
| 42 | 42 | 55.25 | 28 | 2.62 | 50.5 |
| 44 | 44 | 57.25 | 32 | 2.62 | 52.5 |
| 46 | 46 | 59.5 | 32 | 2.62 | 54.75 |
| 48 | 48 | 62.75 | 32 | 2.88 | 57.5 |
| 50 | 50 | 65.75 | 28 | 3.12 | 60 |
| 52 | 52 | 67.75 | 32 | 3.12 | 62 |
| 54 | 54 | 70 | 32 | 3.12 | 64.25 |
| 56 | 56 | 73 | 32 | 3.38 | 66.75 |
| 58 | 58 | 75 | 32 | 3.38 | 68.75 |
| 60 | 60 | 78.5 | 28 | 3.62 | 71.75 |
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
