Polished A4 stainless steel hinge 75x38mm - OEM

A4 stainless steel A4 steels, alloyed with molybdenum, are "acid resistant" and provide better corrosion resistance. A4 is used extensively in the cellulose industry, since this grade of steel was developed for boiling sulphuric acid. It is also suitable to some extent for chloride environments. A4 is also frequently used in the food and shipbuilding industries. Roller Node Hinge A Roller Knuckle Hinge is fitted to the outside of the door and frame. It consists of two parts, each with a rolling knot that fits into the other part, creating the pivot axis for the door. When the door is closed, the rolling knot is completely inserted into the other part of the hinge, making it more discreet and less likely to be caught or damaged. Below is the table of technical dimensions: Dimensions in mm A x B Thickness 75 x 38 5 Difference between Roller Knuckle and Protruding Knuckle 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.