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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
È

 

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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Metro Industries, Inc.
dba Standard-Gasket.com
4018 E. 137th Terrace
Grandview, Missouri  64030 (USA)
Voice: 816-763-7277 / 800-545-8578
Fax: 816-763-0476

 Orders, Inquiries, Customer Service:
 Email: custserv@standard-gasket.com
Phone: 800-545-8578 / 816-763-7277 x350 or x306
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 Email: sales@standard-gasket.com
Phone: 800-545-8578/ 816-763-7277 x302 or x306
Fax: 816-763-0476 Attn: Sales

Standard-Gasket.com is a manufacturer-direct wholesale distributor of a wide variety of standard and semi-standard Rubber Washers, O-Rings, Sponge Weather Stripping, Plastic Washers, O-Rings, Flange Gaskets, Rubber Extrusions, Sheet Rubber, Sponge Rubber, Rubber Grommets, Air Diffuser Tubes/Sleeves, Roll Slitting, and more.
© All materials copyright  Metro Industries, Inc., 1967-2005         Last modified: August 27, 2005