ASA 300 SPIRAL WOUND GASKET - Carbon Steel

Engineered for the demanding conditions of industrial piping systems, the gasket delivers a reliable, leak proof seal where it matters most. At its core, a semi-metallic spiral wound construction pairs stainless steel winding strips, typically 316 grade, with a flexible graphite or PTFE filler. The result is a gasket with exceptional spring-like recovery: as flanged joints expand, contract, or vibrate under thermal cycling, the sealing element moves with them, maintaining consistent compression and closing off microscopic surface gaps on the flange face.

The carbon steel outer centering ring does more than hold the gasket in position within the bolt circle, it acts as a compression stop, protecting the inner sealing element from over tightening during installation and eliminating the risk of blowouts under pressure. Rated for Class 300 medium-to-high pressure applications, this gasket is built to perform reliably across some of the most challenging industrial environments: high-pressure hydrocarbon and process lines in oil, gas, and petrochemical refineries; high-temperature steam and water systems in power generation facilities and boiler houses; and moderate-to-aggressive fluid handling in chemical plants, where filler and winding materials can be specified to suit the application.

For engineers and procurement teams sourcing sealing solutions that hold their integrity across long service cycles, it offers the combination of structural protection, material resilience, and pressure class performance that critical infrastructure demands.

Summary: 

• An ASA 300 spiral wound gasket with a carbon steel (C/I or C/S) outer centering ring is a semi-metallic seal used in industrial piping systems to join raised-face flanges
• Handles medium-to-high pressure classes (Class 300) and prevents leaks under thermal cycling, vibration, or temperature changes
• Made of stainless steel (like 316)
• Provides spring-like recovery so the gasket maintains a tight seal when joints expand or contract
• Typically flexible graphite or PTFE wound between the metal strips, which compresses to fill microscopic gaps on the flange face
• Acts as a centering guide inside the bolt circle, prevents blowouts, and serves as a compression stop, preventing the crushing of the inner selaing element by over- tightening