Gaskets

a piece of rubber or some other material that is used to make a tight seal between two parts that are joined together.

Gaskets are normally made from a flat material, a sheet such as paper, rubber, silicone, metal, cork, felt, neoprene, nitrile, rubber, fiberglass, plastic polymer (polychlorotrifluoroethylene).

The most common types of gaskets are:

  • Ring Type Joints (RTJ)
  • SWG (Spiral Wound Gaskets)
  • Flange gaskets
  • Metal Jacketed gaskets
  • Kammprofile gaskets

Ring Type Joints

R and RX Series

R Series ring type joint gaskets are available in oval and octagonal designs. The oval design can be used in older round bottom gland designs, while both can be used in a flat bottom design. R Series are available up to 5,000 PSI.p>

RX series are interchangable with R series octagonal gaskets designed for API 6B flanges. RX out perform R seriessituations that have higher pressures with more intense vibrations. RX gaskets are available up to 5,000 PSI.

BX Series

Type BX operates in 20,000 psi with non interchangeability. Type BX has a pressure passage hole for pressure equalization on each sealing face sides.

SBX Series

Derived from RX, BX are SRX, SBX in accordance with API 17D standards for usage in applications like subsea well heads etc.


Standard ANSI Flange Gasket Size Chart

Full Face and Ring Type Flange Gasket Dimensions

SIZE

Ring Gaskets

Full Face Gaskets

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