A2 stainless steel A2 grade steels are the most widely used stainless steels. They are used for kitchen equipment, appliances for the chemical industry, fasteners and much more. Also known as 304 grade stainless steel, A2 stainless steel contains around 18% chromium and 8% nickel, giving it high corrosion resistance and good heat resistance. Congà© hinge The Congà© hinge takes its name from its shape, which features a "congà©", i.e. a flared part that fits into a mortise cut into the door or frame. The congà© allows the Hinge to fit securely into the mortise, while the remaining part of the Hinge allows the door to pivot freely. Conga Hinges are often used for interior doors, furniture doors, wardrobe doors and overhead doors. They are also often used in renovation or restoration projects where a traditional appearance is important. Below is a table of technical dimensions (by size): A x B C d à˜ screw à˜ of milling 30 x 200 6 2,5 4,5 6 40 x 200 6 2,5 5,5 8 50 x 300 8 3 5 8 Difference between Rolled Node and Protruding Node Hinges Protruding Knuckle Hinges are often considered more aesthetically pleasing than Roller Knuckle Hinges, as they are virtually invisible once the door is closed. However, Roller Node Hinges can be stronger and more durable than Protruding Node Hinges due to their more robust construction. The choice between these two types of Hinge will therefore depend on the specific needs of each project.