Coach Bolts - Metric - BZP
Often called carriage bolts or cup square hex bolts, coach bolts have a round head with a square underside.
Our zinc-plated coach bolts come complete with a matching hex nut.
Coach bolts are available in a range of sizes. All have metric coarse threads. They are most commonly used in the construction and timber trades.
Please note: All coach bolts up to 100mm length are fully threaded. For our coach bolts over 100mm, thread length can vary depending on the manufacturer, so some products may not be fully threaded. Please feel free to check with us before placing your order to confirm thread length.
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.
A BZP or bright zinc plated fastener is one which has a thin coating of zinc added during production. This protective coating adds durability by protecting the product against rust or oxidisation.