Square Drive Screws Internal Pan Head Sheet Metal Full Thread Bolts

The square drive screws are mainly used in wood furniture or sheet metal. A Robertson, also known as a square or Scrulox screw drive has a square-shaped socket in the screw head and a square protrusion on the tool. Both the tool and the socket have a slight taper. Ever Hardware provides custom-made square drive screws and customizable packaging.

Originally to make the manufacture of the screws practical using cold forming of the heads, this taper provides two other advantages that have served to popularize the drive: it makes inserting the tool easier and tends to help keep the screw on the tooltip without the user needing to hold it there. Robertson screws are commonplace in Canada, though they have been used elsewhere and have become much more common in other countries in recent decades. Robertson screwdrivers are easy to use one-handed because the tapered socket tends to retain the screw, even if it is shaken. They also allow for the use of angled screwdrivers and trim head screws. The socket-headed Robertson screws are self-centering, reduce cam out, stop a power tool when set, and can be removed if painted over or old and rusty. In industry, they speed up production and reduce product damage.

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 square drive screws from 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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