Metallic flat steel gaskets are mostly used for smooth-faced butt-welding flanges, which can withstand lower temperatures and pressures. Oval and octagonal metal steel gaskets, mostly used for trapezoidal groove butt welding flange, nominal pressure range of 6.4 ~ 22.0MPa. Although the sealing is good but the manufacturing complexity, requires high precision.

There are many types of metal washers, according to the shape of the metal flat washers, cross-sectional area of oval, octagonal metal washers and lenticular washers. According to the manufacturing material points are mild steel, stainless acid-resistant steel, copper, aluminum and lead.