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Standard Flange Gasket Size Chart

Stock Neoprene Flange Gaskets in various SizesFull Face and Ring Type Flange Gasket in both Low and High Pressure Standard Sizes

Std
Flange
Size

 

Ring Type Flange Gaskets (click for drawing)

Full Face Flange Gaskets (click for drawing)

125-150 LB

250-300 LB 125-150 LB 250-300 LB
OD ID OD ID OD ID Holes Hole
Dia.
Bolt
Circle
Dia.
OD ID Holes Hole
Dia.
Bolt
Circle
Dia.
1/2" 1  7/8 27/32 2  1/8 27/32 3  1/2 27/32 4 5/8 2  3/8 3  3/4 27/32 4 5/8 2  5/8
3/4" 2  1/4 1  1/16 2  5/8 1  1/16 3  7/8 1  1/16 4 5/8 2  3/4 4  5/8 1  1/16 4 3/4 3  1/4
1" 2  5/8 1  5/16 2  7/8 1  5/16 4  1/4 1  5/16 4 5/8 3  1/8 4  7/8 1  5/16 4 3/4 3  1/2
1  1/4" 3 1  21/32 3  1/4 1  21/32 4  5/8 1  21/32 4 5/8 3  1/2 5  1/4 1  21/32 4 3/4 3  7/8
1  1/2" 3  3/8 1  29/32 3  3/4 1  29/32 5 1  29/32 4 5/8 3  7/8 6  1/8 1  29/32 4 3/4 4  1/2
2" 4  1/8 2  3/8 4  3/8 2  3/8 6 2  3/8 4 3/4 4  3/4 6  1/2 2  3/8 8 7/8 5
2  1/2" 4  7/8 2  7/8 5  1/8 2  7/8 7 2  7/8 4 3/4 5  1/2 7  1/2 2  7/8 8 7/8 5  7/8
3" 5  3/8 3  1/2 5  7/8 3  1/2 7  1/2 3  1/2 4 3/4 6 8  1/4 3  1/2 8 7/8 6  5/8
3  1/2" 6  3/8 4 6  1/2 4 8  1/2 4 8 3/4 7 9 4 8 7/8 7  1/4
4" 6  7/8 4  1/2 7  1/8 4  1/2 9 4  1/2 8 3/4 7  1/2 10 4  1/2 8 7/8 7  7/8
4  1/2" 7 5 7  5/8 5 9  1/4 5 8 3/4 7  3/4 10  1/2 5 8 7/8 8  1/2
5" 7  3/4 5  9/16 8  1/2 5  9/16 10 5  9/16 8 7/8 8  1/2 11 5  9/16 8 7/8 9  1/4
6" 8  3/4 6  5/8 9  7/8 6  5/8 11 6  5/8 8 7/8 9  1/2 12  1/2 6  5/8 12 7/8 10  5/8
7" 10 7  5/8 10  7/8 7  5/8 12  1/2 7  5/8 8 7/8 10  3/4 14 7  5/8 12 7/8 11  7/8
8" 11 8  5/8 12  1/8 8  5/8 13  1/2 8  5/8 8 7/8 11  3/4 15 8  5/8 12 1 13
9" 12  1/2 9  5/8 12  7/8 9  5/8 15 9  5/8 12 7/8 13  1/4 16  1/4 9  5/8 12 1 14
10" 13  3/8 10  3/4 14  1/4 10  3/4 16 10  3/4 12 1 14  1/4 17  1/2 10  3/4 16 1  1/8 15  1/4
12" 16  1/8 12  3/4 16  5/8 12  3/4 19 12  3/4 12 1 17 20  1/2 12  3/4 16 1  1/4 17  3  4
14" 17  3/4 14 19  1/8 14 21 14 12 1  1/8 18  3/4 23 14 20 1  1/4 20  1/4
15' 19 15     22  1/4 15 16 1  1/8 20          
16" 20  1/4 16 21  1/4 16 23  1/2 16 16 1  1/8 21  1/4 25  1/2 16 20 1  3/8 22  1/2
18" 21  5/8 18 23  1/2 18 25 18 16 1  1/4 22  3/4 28 18 24 1  3/8 24  3/4
20" 23  3/8 20 25  3/4 20 27  1/2 20 20 1  1/4 25 30  1/2 20 24 1  3/8 27
22" 26 22 27  3/4 22 29  1/2 22 20 1  1/4 27  1/4 33 22 24 1  3/8 29  1/4
24" 28  1/4 24 30  1/2 24 32 24 20 1  3/8 29  1/2 36 24 24 1  5/8 32
26" 30  1/2 26 32  7/8 26 34  3/4 26 24 1  3/8 31  3/4 38  1/4 26 28 1  5/8 34  1/2
28" 32  3/4 28 35  3/8 28 36  1/2 28 26 1  3/8 34 40  3/4 28 28 1  5/8 37
30" 34  3/4 30 37  1/2 30 38  3/4 30 28 1  3/8 36 43 30 28 1  7/8 39  1/4
32" 38 32 39  5/8 32 41  3/4 32 28 1  5/8 38  1/2 45  1/4 32 28 1  7/8 41  1/2
34" 39 34 41  5/8 34 43  3/4 34 32 1  5/8 40  1/2 47  1/2 34 28 1  7/8 43  1/2
36" 41  1/4 36 44 36 46 36 32 1  5/8 42  3/4 50 36 32 2  1/8 46
38" 43  5/8 38 46  1/8 38 48  3/4 38 36 1  5/8 45  1/4 52  1/4 38 32 2  1/8 48
40' 45  5/8 40 48  3/4 40 50  3/4 40 36 1  5/8 47  1/4 54  1/4 40 36 2  1/8 50  1/4
42" 48 42 50  3/4 42 53 42 36 1  5/8 49  1/2 57 42 36 2  1/8 52  3/4
44" 50  1/8 44 53 44 55  1/4 44 40 1  5/8 51  3/4 59  1/4 44 36 2  1/8 55
46" 52  1/8 46 55  1/4 46 57  1/4 46 40 1  5/8 53  3/4 61  1/2 46 40 2  1/8 57  1/4
48" 54  1/2 48 58  3/4 48 59  1/2 48 44 1  5/8 56 65 48 40 2  1/8 60  3/4
  • Dimensions per ANSI B16.5 standard for pipe flanges and gaskets.
  • Dimensional Tolerances (unless otherwise stated) through 1" @ +/- 1/32", from 1" through 12" @ +/- 1/16", from 12" through 24" @+/- 3/32", and over 24" @ +/- 1/4".
     
  • "New Style" Flange Gasket dimensions are listed, but "Old Style" are also available.  The only difference is that "New Style" have a slightly enlarged ID on 12" and below so as not to obstruct flow when compressed (bolt holes/circles unaffected).
     
  • Standard Pipe Flange Gaskets are SBR Rubber (a.k.a. Red Rubber), but Neoprene, EPDM, Buna  N, Silicone, Viton (Fluoroelastomer), and other rubber compounds are also readily available.
     
  • Gasket thicknesses between 1/16" and 3/8" are readily available in most materials; standard hardness options include 40 through 80 durometer (Shore A).

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MI Rubber and Gasket Building (Grandview, MO)Metro Industries, Inc.
4018 E. 137th Terrace  Grandview, Missouri  64030 (USA)

Centrally located in the Greater Kansas City area

.
All materials copyright  Metro Industries, Inc., 1967-2005      Last modified: January 17, 2010

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Metro Industries proudly operates under an ISO 9001:2008 Quality System (click to view certificate)

Try MI Rubber & Gasket for the best information on the web on Rubber Washers, Flange Gaskets, O-Rings, Plastic Washers/Shims, Sponge Weather Stripping, Rubber Grommets, Steel Rule Die Cutting, Rubber Gaskets, Rubber Extrusions, Sheet Rubber, Sponge Rubber, Molded Rubber, Air Diffuser Tubes/Sleeves, Roll Slitting, and more.