Plain Washers

An AN960 plain washer provides a smooth surface between a nut and the material being clamped. These washers are made of cadmium-plated steel, commercial brass (B), corrosion-resistant steel (C) and 2024 aluminum alloy (D). They are available in sizes that range from those that fit a number two machine screw to those that fit a one-inch bolt.

If a thin washer is needed, a light series washer that is one-half the thickness of a regular washer is available. An example of where a light series washer should be used is if the castellations of an AN310 nut do not line up with a cotter pin hole when the nut is properly torqued. In this situation a light series washer can be substituted for the regular washer to align the holes. A light series washer is identified by the letter "L" added to the code. For example, the code AN960L identifies a light series washer. When working with wood or composite structures, washers with a large surface area are used to spread the fastener load over a wider area. These large are washers carry the code of AN970 and are all made of cadmium-plated steel with inside diameters from 3/16 to 1/2 inch.. See figure 1 for types of washers.

(Figure 1 )

This is the example of plain washer AN960. see figure 2.

(Figure 2)