1. Stainless Material: Stainless steel is typically the material used in the construction of such flanges. Stainless steel is known for its resistance to corrosion, making it a preferred choice, especially in applications exposed to water or chemical substances.

2. Threaded: A distinctive design feature of stainless steel threaded flanges is the presence of threaded connections on the inner or outer surface of the flange. This threaded design is used to provide a threaded connection to another pipe, valve, or device. Such threaded connections allow for the quick and reliable installation or removal of pipe lines or equipment when needed. 

Stainless steel threaded flanges are commonly used in industrial applications and are often found in industries such as chemistry, petrochemistry, food processing, maritime, energy production, and many others. These flanges are used to create strong and durable connections capable of withstanding high temperatures, pressures, and various chemical environments.