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The order of types presented is based somewhat on the shape; number of corners, points or drive surfaces; number of ways to engage the drive; etc and from least to most. Icon patterns of each screw type are a view of the screw head, straight on. They can best be visualized if you ...
Screw makers of the 1930s dismissed the Phillips concept since it calls for a relatively complex recessed socket shape in the head of the screw; as distinct from the simple milled slot of a slotted type screw. Phillips then called on the American Screw Company, a newcomer to the industry wh...