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Gaskets

We supply top-quality gaskets in materials including Red Rubber and Green Non-Asbestos for superior performance. Find the gaskets and accessories necessary in standard and compound materials-1/16-inch and 1/8-inch, with other thicknesses available.

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Dimensions: Flange Gaskets

ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE STATED
Nominal Pipe Size I.D. (old style) ANSI Size I.D. (new style) Full Face Gaskets – (125/150#) Outside Diameter (OD) Full Face Gaskets – (125/150#) # Of Holes Full Face Gaskets – (125/150#) Bolt Hole Diameter Full Face Gaskets – (125/150#) Bolt Circle Diameter (BC) Full Face Gaskets – (250/300#) Outside Diameter (OD) Full Face Gaskets – (250/300#) # Of Holes Full Face Gaskets – (250/300#) Bolt Hole Diameter Full Face Gaskets – (250/300#) Bolt Circle Diameter (BC) Ring Gaskets 125/150# Outside Diameter (OD) Ring Gaskets 250/300# outside Diameter (OD)
0.5 0.878 3.50 4 0.625 2.375 3.750 4 0.625 2.625 1.875 2.125
0.75 1.062 3.88 4 0.625 2.750 4.625 4 0.750 3.250 2.250 2.625
1 1.313 4.25 4 0.625 3.125 4.875 4 0.750 3.500 2.625 2.875
1.25 1.683 4.63 4 0.625 3.500 5.250 4 0.750 3.875 3.000 3.250
1.5 1.943 5.00 4 0.625 3.875 6.125 4 0.875 4.500 3.375 3.750
2 2.375 6.00 4 0.750 4.750 6.500 8 0.875 5.000 4.125 4.375
2.5 2.875 7.00 4 0.750 5.500 7.500 8 0.875 5.875 4.875 5.125
3 3.500 7.50 4 0.750 6.000 8.250 8 0.875 6.625 5.375 5.875
3.5 4.000 8.50 8 0.750 7.000 9.000 8 0.875 7.250 6.375 6.500
4 4.500 9.00 8 0.750 7.500 10.000 8 0.875 7.875 6.875 7.125
5 5.563 10.00 8 0.875 8.500 11.000 8 0.875 9.250 7.750 8.500
6 6.625 11.00 8 0.875 9.500 12.500 12 0.875 10.625 8.750 9.875
8 8.650 13.50 8 0.875 11.750 15.000 12 1.000 13.000 11.000 12.125
10 10.750 16.00 12 1.000 14.250 17.500 16 1.125 15.250 13.380 14.250
12 12.750 19.00 12 1.000 17.000 20.500 16 1.250 17.750 16.130 16.625
14 14.000 21.00 12 1.125 18.750 23.000 20 1.250 20.250 17.750 19.125
16 16.000 23.50 16 1.125 21.250 25.500 20 1.375 22.500 20.500 21.250
18 18.000 25.00 16 1.250 22.750 28.000 24 1.375 24.750 21.630 23.500
20 20.000 27.50 20 1.250 25.000 30.500 24 1.375 27.000 23.880 25.750
22 22.000 29.50 20 1.375 27.250 33.000 24 1.625 29.250 26.000 27.625
24 24.000 32.00 20 1.375 29.500 36.000 24 1.625 32.000 28.250 30.500
26 26.000 34.75 24 1.375 31.750 38.250 28 1.75 34.5 30.5 32.875
28 28.000 36.50 28 1.375 34.000 40.750 28 1.75 37 32.75 35.375
30 30.000 38.75 28 1.375 36.000 43.000 28 1.875 39.5 34.75 37.5
32 32.000 41.75 28 1.625 38.500 45.250 28 2 41.5 38 39.625
34 34.000 43.75 32 1.625 40.500 47.500 28 2 43.5 39 41.625
36 36.000 46.00 32 1.625 42.750 50.000 32 2.125 46 41.25 44
38 38.000 48.75 36 1.625 45.250 52.250 32 2.25 48 43.63 46.125
40 40.000 50.75 36 1.625 47.250 54.250 36 2.25 50.25 45.63 48.75
42 42.000 53.00 36 1.625 49.500 57.000 36 2.25 52.75 48 50.75
44 44.000 55.25 40 1.625 51.750 59.250 36 2.25 55 50.13 53
46 46.000 57.25 40 1.625 53.750 61.500 40 2.25 57.75 52.13 55.25
48 48.000 59.50 44 1.625 56.000 65.000 40 2.25 60.75 54.5 58.5
  Notes:
  • Dimensions per ANSI B 16.5 and AWWA C110 standards for pipe flanges and flange gaskets.
  • Dimensional tolerances (unless otherwise stated): Up to 1” @ +/- .0325”; 1.25” thru 12” @ +/- .0625”; 14” thru 24” @ +/- .0975”; 24” and above @ +/- .25”.
  • Standard gasket material is SBR (Red Rubber) or Non-Asbestos (Green), but Neoprene, EPDM, Buna N, Silicone, Viton Teflon and other compounds are readily available.
  • Standard thicknesses are 1/16” and 1/8”, but other thicknesses are available.
  • Sizes above 24″ are available upon request (minimum order quantity may apply).
 

Basic Compounds and Properties for Flange Gaskets

Common Name(s) Designation Composition General Properties General Chemical Resistance To: General Chemical Resistance Attacked By:
Neoprene CR Chloroprene Good weathering resistance and flame retarding. Good resistance to petroleum based fluids. Moderate chemicals and acids, ozone, oils, fats, greases and many solvents. Strong oxidizing acids, esters, ketones, chlorinated aromatic and nitro hydrocarbons.
EPDM EPM Ethylene-propylen-diene-molimers Excellent ozone, chemical and aging resistance. Excellent heat resistance. Poor resistance to petroleum based fluids. Heat, ozone, strong oxidizing chemicals and acetone. Petroleum based fluids, animal fats, solvents and greases.
Buna-N NBR Nitrile-butadiene Excellent resistance to petroleum based fluids. Good physical properties. Many hydrocarbons, fats, oils, hydraulic fluids and chemicals. Ozone (except PVC blends), ketones, esters, aldehydes, chlorinated and nitro hydrocarbons.
Silicones Q, Si Polysiloxane Excellent high and low temperature properties. Good oil resistance. FDA compound. Good physical properties. Moderate chemicals and acids, ozone, oils, fats, greases and concentrated sodium hydroxide. Many solvents, high aromatic hydrocarbons, concentrated acids, dilute sodium hydroxide.
SBR (Red Rubber) SBR Styrene-butadiene Good physical properties and abrasion resistance. Poor resistance to petroleum based fluids. Most moderate chemicals wet or dry, organic acids, alcohols, ketones and aldehydes. Ozone, strong acids, animal fats, oils, greases and most hydrocarbons.
Viton (Flouro-elastomer) FPM Hexafluoropropylene-vinylidene flouride Excellent oil and air resistance at low and high temperatures. Excellent chemical resistance. All aliphatic, aromatic and halogenated hydrocarbons, acids, animal and vegetable oils. Ketones, low molecular weight esters and nitro containing compounds.
Teflon® (Flourocarbon resin) TFE Polytetra-flouroethylene Excellent chemical and solvent resistance. Resistant to very high temperatures. Inert to most chemicals, smooth anti-adhesive surface. easily cleaned. Acetates, NA-K and some amino acids.
Non-Asbestos NA Aramid fiber and synthetic fibers bonded with NBR. General service water & oil gasket. Pressures to 1595 psi, temp to 750? F. Mild acids, alkalis, oils, general chemicals & petroleum derivatives and steam. Consult customer service for chemical compatibility.
  Notes:
  • The chemical guidelines in this table are offered as a general indication of the compatibility of various materials with chemicals and fluids listed.
  • When in doubt, a sample of the compound should always be tested with the particular chemical it is to handle.
  • API stocks Non-Asbestos (GNA Series) and SBR (GRR Series) flange gaskets, but others are available upon request (minimum order quantity may apply).
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