Red Fibre Washers - Metric

This section of our website is home to red fibre washers. Red fibre washers are most commonly used in the plumbing and automotive industries to create an effective seal for preventing leaks.

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.