ASTM A105 carbon steel spectacle blind flanges are used to isolate or block off a section of a piping system, providing a secure and reliable means to halt the flow of fluids or gases. These flanges are designed with a unique “spectacle” shape, consisting of two discs: one solid (blind) and one open (spacer). The spectacle blind flange can be easily rotated to switch between a fully sealed and an open state, making it highly versatile for maintenance and operational flexibility. Made from ASTM A105 carbon steel, these flanges are robust and suited for high-pressure and high-temperature applications. They are commonly utilized in industries such as oil and gas, chemical processing, and power generation.
| Property | Details |
|---|---|
| Material | ASTM A105 Carbon Steel |
| Standards | ASTM A105, ANSI/ASME B16.5 |
| Type | Spectacle Blind Flange |
| Dimensions | Available in various sizes |
| Pressure Rating | Class 150, Class 300, Class 600, Class 900 |
| Temperature Rating | Suitable for high-temperature applications |
| Surface Finish | Smooth, precision-machined |
| Flange Face | Can be flat face or raised face |
| Design | Dual disc with one solid (blind) and one open (spacer) |
| Applications | Oil and gas, chemical processing, power generation |
| Advantages | Versatile operation, easy maintenance and isolation |
| Function | Allows for easy switching between a sealed and open state |
| Connection Type | Bolted to pipe ends |
| Manufacturing | Precision-machined for accurate fitting |
| Ordering Information | Specify material grade, size, pressure class |
| Suppliers | McMaster-Carr, Grainger, Swagelok, Penn Stainless Products |


















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