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ISO 6788:1997
Assembly tools for screws and nuts - Four-way socket wrenches - Dimensions and torque test
This International Standard specifies the dimensions of socket heads, in millimetres, of four-way socket wrenches types 1, 2, 3 and 4 and also lays down test conditions to check the suitability of tool performance.
This International Standard applies to four-way socket wrenches for assembling screws and nuts with widths across flats of metric dimensions for trucks and cars.
The wrenches are listed under number 21 in ISO 1703.
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International Organization for Standardization [iso]
