Galvanised Coach Screws Hex Head Grade 8.8 Zinc Plating Lag Bolts

The galvanised coach screws are heavy duty screws designed for metal to timber connections, or to join heavy timbers. Also known as lag bolts or lag screws, they have a square or hexagonal head engineered to be used with a wrench, spanner, or pliers. These screws come in a wide range of sizes, from the very small ones packed with furniture designed to be assembled by the consumer to extremely big ones used in large scale construction projects. Ever Hardware provides the custom made galvanised coach screws and customizable packaging.

Coach screws consist of an externally threaded cylindrical shaft that tapers to a point, with ahead at the other end. When they are driven into timber, the threads bite into the wood, while the head stops the screw from going all the way through as it provides compression. The essential form of the screw has been in existence for over 2,000 years, although metal screws for construction and woodworking have only been in use since it became possible to mass-manufacture them in the late 19th century. It was not until the Second World War that screw sizes became standardized so that they could be manufactured and shared between Allied forces with ease.
These types of screws are often used at critical joints in construction because of their sturdy manufacture. Screws are often superior to nails for construction projects in general because they can be easily removed and reused. Coach screws are preferred for joints that see heavy use and other areas in which additional support through the use of metal flanges is needed.
Galvanization, or galvanisation, (or galvanizing as it is most commonly called in that industry), is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc. Galvanizing protects in three ways:
It forms a coating of zinc which, when intact, prevents corrosive substances from reaching the underlying steel or iron.
The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
The zinc protects its base metal by corroding before iron. For better results, the application of chromates over zinc is also seen as an industrial trend.

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