Dome Nuts - Metric

Often called an acorn nut, this is a decorative type of nut that uses to cover the exposed threads of a bolt or stud. As their name suggests, they feature a dome styled head. Dome nuts are available in a variety of finishes including brass, nylon, BZP and stainless steel.

Metric is the most common thread type in production today. Usually specified as M then a number x another number. This signifies the thread diameter and the length of the fastener.

For example, M4 x 30 means that the major thread diameter (the external distance across the outside of the thread) is 4mm and the length is 30mm. Length is usually measured from the underside of the fastener head.