A friction stay is a type of hinge used in windows that provides support and allows the window to open and close smoothly. The friction stay is typically made of stainless steel, which offers excellent durability and corrosion resistance.

The two most common types of stainless steel used in friction stays are SS 304 and SS 202. Both types of stainless steel offer good strength and corrosion resistance, but they differ in a few key ways:

• SS 304: This is a high-grade stainless steel that contains a higher percentage of chromium and nickel than SS 202. This gives it superior corrosion resistance and makes it more resistant to tarnishing and rusting over time. SS 304 is a common choice for applications that require high levels of durability and resistance to corrosion.
• SS 202: This is a lower-grade stainless steel that contains less nickel than SS 304. While it is still a durable and corrosion-resistant material, it may not be as resistant to tarnishing and rusting over time as SS 304. SS 202 is a more economical choice for applications that do not require the high levels of durability and corrosion resistance offered by SS 304.

When choosing between SS 304 and SS 202 friction stays, it is important to consider the specific needs of the application and the level of durability and corrosion resistance required. In general, SS 304 is a more reliable and durable choice for applications that require high levels of corrosion resistance and long-lasting performance, while SS 202 may be suitable for less demanding applications where cost is a factor.