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150# and 300# Flanged Ring Gaskets

Ring flange gaskets are used in various industries, including Chemical Processing, Pharmaceutical, Hydro-Electric, Oil and Gas, and Medical.
These gaskets are suitable for service with ANSI 150# rated flanged connections. Also available with ANSI 300# rated flanged connections.

Resources Additional Specs
Ring Flanged Gasket Style
125-150 LB 250-300 LB
Flange Size OD ID OD ID
1/2″ 1 7/8 27/32 2 1/8 27/32
3/4″ 2 1/4 1 1/16 2 5/8 1 1/16
1″ 2 5/8 1 5/16 2 7/8 1 5/16
1 1/4″ 3 1 21/32 3 1/4 1 21/32
1 1/2″ 3 3/8 1 29/32 3 3/4 1 29/32
2″ 4 1/8 2 3/8 4 3/8 2 3/8
2 1/2″ 4 7/8 2 7/8 5 1/8 2 7/8
3″ 5 3/8 3 1/2 5 7/8 3 1/2
3 1/2″ 6 3/8 4 6 1/2 4
4″ 6 7/8 4 1/2 7 1/8 4 1/2
4 1/2″ 7 5 7 5/8 5
5″ 7 3/4 5 9/16 8 1/2 5 9/16
5″ 7 3/4 5 9/16 8 1/2 5 9/16
6″ 8 3/4 6 5/8 9 7/8 6 5/8
7″ 10 7 5/8 10 7/8 7 5/8
8″ 11 8 5/8 12 1/8 8 5/8
9″ 12 1/2 9 5/8 12 7/8 9 5/8
10″ 13 3/8 10 3/4 14 1/4 10 3/4
12″ 16 1/8 12 3/4 16 5/8 12 3/4
14″ 17 3/4 14 19 1/8 14
15″ 19 15
16″ 20 1/4 16 21 1/4 16
18″ 21 5/8 18 23 1/2 18
20″ 23 3/8 20 25 3/4 20
22″ 26 22 27 3/4 22
24″ 28 1/4 24 30 1/2 24
26″ 30 1/2 26 32 7/8 26
28″ 32 3/4 28 35 3/8 28
30″ 34 3/4 30 37 1/2 30
32″ 38 32 39 5/8 32
34″ 39 34 41 5/8 34
36″ 41 1/4 36 44 36
38″ 43 5/8 38 46 1/8 38
40″ 45 5/8 40 48 3/4 40
42″ 48 42 50 3/4 42
44″ 50 1/8 44 53 44
46″ 52 1/8 46 55 1/4 46
48″ 54 1/2 48 58 3/4 48

Ring Flanged Gaskets are great for industrial applications

  • 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.
  • Ring Flanged Gasket thicknesses between 1/16″ and 3/8″ are readily available in most materials; standard hardness options include 40 through 80 durometer (Shore A).

Additional Specs

  • Buna (Black or White)
  • EPDM (Black or White)
  • FKM Fluoroelastomer (Black or White)
  • Platinum Silicone
  • Tuf-Flex®
  • Tuf-Steel®