Robertson screw

As patents expire and awareness of their advantages have spread, Robertson fasteners have become popular in woodworking and general construction.

His breakthrough in 1908 was to design the socket's taper and proportions in such a combination that the heads could be easily and successfully cold formed,[3]: 79–81  making such screws a valuable commercial proposition.

Linear broaching, cutting corners into a drilled hole (similar to the action of a mortising machine for woodworking) has also been used over the decades.

When Robertson refused to license the design, Ford realized that the supply of screws would not be guaranteed, and chose to limit their use to his Canadian division.

A few tool manufacturers make bits to engage this screw head better than the traditional Phillips allowing for more torque before camout, for example, the C1 and C2 from Klein[10] and the ECX #1 & #2 from Milwaukee.