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发布日期:2021年01月22日
DIMENSIONS CHART FOR NONMETALLIC FLAT GASKETS FOR CLASS 125 CAST IRON FLANGES

Nonmetallic flat ring and full face gasket dimensions for ASME/ANSI B16.1 Class 125 cast iron pipe flanges and flanged fittings per ASME B16.21.


Flat Ring Gasket

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Flat Ring Gasket Dimensions for Class 125 Cast Iron Pipe Flanges (inches)
NPS Gasket ID Gasket OD
1 1.31 2.62
1 1/4 1.66 3.00
1 1/2 1.91 3.38
2 2.38 4.12
2 1/2 2.88 4.88
3 3.50 5.38
3 1/2 4.00 6.38
4 4.50 6.88
5 5.56 7.75
6 6.62 8.75
8 8.62 11.00
10 10.75 13.88
12 12.75 16.12
14 14.00 17.75
16 16.00 20.25
18 18.00 21.62
20 20.00 23.88
24 24.00 28.25
30 30.00 34.75
36 36.00 41.25
42 42.00 48.00
48 48.00 54.50

Notes:

NPS - Nominal Pipe Size, OD - Outer Diameter, ID - Inner Diameter


Full Face Gasket

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Full Face Gasket Dimensions for Class 125 Cast Iron Pipe Flanges (inches)
NPS ID OD Number
of
Holes
Hole
Diameter
Bolt
Circle
Dia.
1 1.31 4.25 4 0.62 3.12
1 1/4 1.66 4.62 4 0.62 3.50
1 1/2 1.91 5.00 4 0.62 3.88
2 2.38 6.00 4 0.75 4.75
2 1/2 2.88 7.00 4 0.75 5.50
3 3.50 7.50 4 0.75 6.00
3 1/2 4.00 8.50 8 0.75 7.00
4 4.50 9.00 8 0.75 7.50
5 5.56 10.00 8 0.88 8.50
6 6.62 11.00 8 0.88 9.50
8 8.62 13.50 8 0.88 11.75
10 10.75 16.00 12 1.00 14.25
12 12.75 19.00 12 1.00 17.00
14 14.00 21.00 12 1.12 18.75
16 16.00 23.50 16 1.12 21.25
18 18.00 25.00 16 1.25 22.75
20 20.00 27.50 20 1.25 25.00
24 24.00 32.00 20 1.38 29.50
30 30.00 38.75 28 1.38 36.00
36 36.00 46.00 32 1.62 42.75
42 42.00 53.00 36 1.62 49.50
48 48.00 59.50 44 1.62 56.00

Notes:

NPS - Nominal Pipe Size, OD - Gasket Outer Diameter, ID - Gasket Inner Diameter


Reference:

  • ASME B16.21-1992, Nonmetallic Flat Gaskets for Pipe Flanges