Titanium is an inert metal alloy that is usually combined with aluminum, steel, manganese and molybdenum. A titanium alloy is almost as strong as steel but forty five percent lighter. Titanium fasteners are used in the aircraft industry in a great quantity because they reduce the weight of the aircraft and are corrosion resistant. Titanium fasteners such as screws are also corrosion resistant because of the oxide layer that forms on titanium alloys. This layer is the main reason for the extensive use of titanium in many industries. An amazing fact about this layer is that it is automatically replaced if scratched or removed. Fasteners and screws undergo tremendous amount of scratching and friction and this is the reason why titanium is used in the manufacturing of such products.