Gasket Standards

ASME Standards

• Nonmetallic gasket dimensions and tolerances in accordance with ASME B16.21 for ASME B16.5 and ASME B16.47 flanges.
• Standard thicknesses are 1/16" and 1/8", but others are available.
• Spiral wound gaskets for ASME B16.5 1/4" to 24" dimensions and tolerances in accordance with ASME B16.20.
• Spiral wound gaskets for ASME B16.47 22" to 60" Series A (MSS SP-44) dimensions and tolerances in accordance with ASME B16.20.
• Spiral wound gaskets for ASME B16.47 26" to 60" Series B (API Std 605) dimensions and tolerances in accordance with ASME B16.20.
• ASME B16.20 - Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed
• ASME B16.21 - Nonmetallic Flat Gaskets for Pipe Flanges
• ASME B16.47 - Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard
• ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through 24

ISO Standards

• ISO 4709 - Composition cork -- Gasket material -- Classification system, requirements, sampling, packaging and marking
• ISO 7483 - Dimensions of gaskets for use with flanges to ISO 700

Flange Gasket Sizes - 1/2" through 24"
	Spiral Wound Gasket Gasker - SW, ANSI Cl 150, B16.5, ASME B16.20 (in) Gasket - SW, ANSI Cl 300, B16.5, ASME B16.20 (in) Gasket - SW, ANSI Cl 400, B16.5, ASME B16.20 (in) Gasker - SW, ANSI Cl 600, B16.5, ASME B16.20 (in) Gasket - SW, ANSI Cl 900, B16.5, ASME B16.20 (in) Gasket - SW, ANSI Cl 1500, B16.5, ASME B16.20 (in) Gasket - SW, ANSI Cl 2500, B16.5, ASME B16.20 (in)		Ring Type Joint Gasket Gasker - RTJ, ANSI Cl 150-2500, ASME B16.20, Ring Numbers (in) Gasker - RTJ, ANSI Cl 150-2500, ASME 16.20, Ring Dimensions (in)
	Full Face Gasket Gasker - FF, ANSI Cl 125/150, ASME B16.21 (in) Gasket - FF, ANSI Cl 250/300, ASME B16.21 (in)		Ring Type Gasket Gasket - RT, ANSI Cl 125/150, ASME B16.21 (in) Gasket - RT, ANSI Cl 250/300, ASME B16.21 (in)

Flange Gasket Sizes - 26" through 60"
	Spiral Wound Gasket, Series A Gasket - SW, ANSI Cl 150, B16.47 Series A, ASME B16.20 (in) Gasket - SW, ANSI Cl 300, B16.47 Series A, ASME B16.20 (in) Gasket - SW, ANSI Cl 400, B16.47 Series A, ASME B16.20 (in) Gasket - SW, ANSI Cl 600, B16.47 Series A, ASME B16.20 (in) Gasket - SW, ANSI Cl 900, B16.47 Series A, ASME B16.20 (in)		Spiral Wound Gasket, Series B Gasket - SW, ANSI Cl 75, B16.47 Series B, ASME B16.20 (in) Gasket - SW, ANSI Cl 150, B16.47 Series B, ASME B16.20 (in) Gasket - SW, ANSI Cl 300, B16.47 Series B, ASME B16.20 (in) Gasket - SW, ANSI Cl 400, B16.47 Series B, ASME B16.20 (in) Gasket - SW, ANSI Cl 600, B16.47 Series B, ASME B16.20 (in) Gasket - SW, ANSI Cl 900, B16.47 Series B, ASME B16.20 (in)