Sealing rings A=flat sealing rings DIN 7603A-copper 20x26x1,5

Copper is a chemical element with the element symbol Cu. As a relatively soft metal, copper is easy to mould and tough. It has many uses as an excellent conductor of heat and electricity. It also belongs to the group of coinage metals. As an important technology and functional metal, copper is a semi-precious metal. Copper-tin alloys are known as bronze, copper-zinc alloys as brass.

The term plain indicates a completely untreated, merely oiled, smooth surface for all DIN and ISO screws such as wood screws, hexagon head screws, threaded rods, nuts and many types of washers.