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ISO 3315:1996
Assembly tools for screws and nuts - Driving parts for hand-operated square drive socket wrenches - Dimensions and tests
Applies to attachments for hand-operated square drive socket wrenches as listed under the numbers 251 to 257 in ISO 1703. Specifies overall dimensions, Rockwell hardness values, minimum torsional strength values, designation and marking.
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International Organization for Standardization [iso]