Socket Screws - Set Grub - Cone Point - Metric - BZP
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.
A BZP or bright zinc plated fastener is one that has a thin coating of zinc added during production. This protective coating adds durability by protecting the product against rust or oxidisation.