Ring 150# 300#

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.

 Ring Gasket Style
 125-150 LB250-300 LB
Flange SizeODIDODID
1/2"1  7/827/322  1/827/32
3/4"2 1/41 1/162 5/81 1/16
1"2 5/81 5/162 7/81 5/16
1 1/4"31 21/323 1/41 21/32
1 1/2"3 3/81 29/323 3/41 29/32
2"4 1/82 3/84 3/82 3/8
2 1/2"4 7/82 7/85 1/82 7/8
3"5 3/83 1/25 7/83 1/2
3 1/2"6 3/846 1/24
4"6 7/84 1/27 1/84 1/2
4 1/2"757 5/85
5"7 3/45 9/168 1/25 9/16
6"8 3/46 5/89 7/86 5/8
7"107 5/810 7/87 5/8
8"118 5/812 1/88 5/8
9"12 1/29 5/812 7/89 5/8
10"13 3/810 3/414 1/410 3/4
12"16 1/812 3/416 5/812 3/4
14"17 3/41419 1/814
15"1915  
16"20 1/41621 1/416
18"21 5/81823 1/218
20"23 3/82025 3/420
22"262227 3/422
24"28 1/42430 1/224
26"30 1/22632 7/826
28"32 3/42835 3/828
30"34 3/43037 1/230
32"383239 5/832
34"393441 5/834
36"41 1/4364436
38"43 5/83846 1/838
40"45 5/84048 3/440
42"484250 3/442
44"50 1/8445344
46"52 1/84655 1/446
48"54 1/24858 3/448
  • 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).
  • Buna (Black or White)
  • EPDM (Black or White)
  • FKM Fluoroelastomer (Black or White)
  • Platinum Silicone
  • Tuf-Flex®
  • Tuf-Steel®