Square washer that can be used for all types of installations where a heavy-duty washer is required. S4B is usually used in timber structures.

The square washer is made of steel with hot dip galvanized surface finish. Manufactured according to the standard DIN 436.

A bolt in a particular strength class fitted with a nut in the corresponding strength class is designed to form a joint in which one can obtain a preload in the bolt corresponding to the test force without the risk of the thread shearing. It is important to choose the right type of washer to suit the installation.