Washers

The most common type of washer. Available in plain finish, zinc plating, hot dipped galvanized, and 18-8 stainless steel.

Has a smaller outside diameter than USS. Available in zinc plating or hot dipped galvanized.

Larger outside diameter. Only available in Zinc Plated and 18-8 Stainless Steel.

Puts tension on the nut to prevent loosening. Available in zinc plating, hot dipped galvanized, 18-8 stainless, and 316 stainless steel.

Square plate washers have a larger surface area than round washers. They develop more friction when tightening against wood. Larger and thicker than standard washers. (Comparable to dock washers). Only available in Hot Dipped Galvanized.

Beveled washers are intended for use with Standard beams and channels in structural applications, to compensate for lack of a square bearing surface.

Dock washers have a larger than normal outside diameter. Dock washers are also thicker than normal washers. They are only available in Hot Dipped Galvanized.

Has a smaller outside diameter than USS washer. Intended for use with A325 structural bolts.