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Squares

Fastener assembly tool standards cover the tools, and their variable parts, that handle the fasteners during their installation. Given the variability within screwdrivers, starting from whether they are machine or hand operated, and continuing down all the way to the bits that actually make contact with the fastener, standardization promotes interchangeability between tools and parts of different manufacturers, and fasteners of yet a different manufacturer. These standards are related to the specifications of squares and their corresponding tools.

ISO 1174-1:2011

Assembly tools for screws and nuts - Driving squares - Part 1: Driving squares for hand socket tools

ISO 1174-1:2011 specifies the dimensions, separation force and designation of driving squares for hand socket tools.

ISO 1174-2:1996

Assembly tools for screws and nuts - Driving squares - Part 2: Driving squares for power socket tools

Specifies the dimensions and designation of driving squares for power socket tools.

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