Ring 150# and 300# Gaskets

Ring 150# and 300# gasket.

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.

  • 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)

Available Materials

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