Metallic Gaskets

Metallic Gasket

Metallic gaskets are heavy duty, high-pressure gaskets largely used in offshore petrochemical applications. They are precision engineered components designed to be used in conjunction with precision-machined flanges. All our ring joints are manufactured according to ASME B16.20.

The gasket material is selected on a number of grounds primarily; chemical compatibility with the media and the hardness of the flange. The gasket material ideally needs to be roughly 30 Brinell less than the flange material to ensure sufficient deformation of the gasket without damaging the flange facing.


Heavy duty, high pressure applications in the petrochemical and offshore industry.


Type Nominal Pipe Size Class Ratings
Type R Oval and Octagonal ½ " up to 24" 150 to 2500 ASME B16.20
26" up to 36" 300 to 900 ASME B16.20
1½" up to 20" Series A API 6A
Type RX 1½ " up to 24" 720 to 5000 ASME B16.20
26" up to 36" 300 to 900 ASME B16.20
1½ " up to 20"  Series A API 6A
Type BX 1 11/16 " up to 21¼ " 5000 to 20000 ASME B16.20

Common Materials:

Material Typical Maximum
Hardness (Brinell)
Temperature Identification
Soft Iron 90 -60°C to 500°C D
Low Carbon Steel 120 -40°C to 500°C S
4-6% Chrome; ½% Mo 130 -40°C to 650°C F5
Stainless 304 160 -250°C to 550°C S304
Stainless 316 160 -110°C to 800°C S316
Stainless 321 160 -250°C to 800°C S321
Stainless 347 160 -250°C to 800°C S347
Stainless 410 170 -20°C to 500°C S410
Monel (N04400) 135 400°C N04400
UNS N08904 180 400°C 904L
Inconel 625  - 650°C 625
Incoloy 825  - 450°C 825
Hastelloy C-276  - 450°C C-276
Titanium  - 350°C TI

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