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ISO 3316:1996 Assembly tools for screws and nuts - Attachments for hand-operated square drive socket wrenches - Dimensions and tests
standard by International Organization for Standardization, 12/01/1996
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Applies to attachments for hand-operated square drive socket wrenches as listed under the numbers 203 to 206 in ISO 1703. Specifies overall dimensions, Rockwell hardness values, minimum torsional strength values, designation and marking.