McMaster 91535A110 590 Piece USS Washer Assortment

These assortments offer a range of sizes that all meet USS specifications. USS washers typically have larger diameters than SAE washers to accommodate larger nuts and screws and to distribute pressure across a wider surface area. They are also thicker, so they withstand heavier loads and span wider gaps when used as spacers. Labels in the lid include our part numbers, so it's easy to replenish the assortments.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.