Washer A4

The A4 washer is made of stainless steel containing molybdenum. This composition ensures the fastener performs reliably in contact with aggressive environments — salt, chlorine, acids.

A washer is placed under the nut or bolt head to:

• protect the structure from dents when tightening torque is increased;
• increase the strength of the connection;
• level the surface of the element under the fastener;
• prevent spontaneous loosening of the fastened connection.

There are several types of A4 washers: flat washers, spring lock washers (single-coil, i.e. grovers), lock washers, body washers, sealing washers with a rubber gasket, roofing washers, and serrated washers. Most often washers are round, but rectangular angled ones also occur — for fastening angles and channels.

A4 washers made of austenitic steel are distinguished by high corrosion resistance, are harmless to humans, and do not deform under strong heating or cooling. These fasteners are characterized by ease of machining and a long service life without change in technical properties.