Keps nuts also known as washer nuts or free spinning washer nuts are an attached free spinning lock washer. For applications where there is little or no vibration in the assembly and when the assembly consists of thin materials, slots or non-precision oversize holes. It is used to make assembly more convenient. Common washer types are star-type lock washers, conical, and flat washers. Zinc plated fasteners have good corrosion resistant qualities and are a good choice for indoor, outdoor and industrial applications.