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This International Standard specifies the dimensions and designation of countersinks for countersunk head screws with a head configuration in accordance with ISO 7721. This International Standard is applicable to the following types of screws: -- slotted countersunk flat head screws according to ISO 2009; -- slotted countersunk raised head screws according to ISO 2010; -- slotted countersunk flat head tapping screws according to ISO 1482; -- slotted countersunk raised head tapping screws according to ISO 1483; -- cross-recessed countersunk flat head screws according to ISO 7046-1 and ISO 7046-2; -- cross-recessed countersunk raised head screws according to ISO 7047; -- cross-recessed countersunk flat head tapping screws according to ISO 7050; -- cross-recessed countersunk raised head tapping screws according to ISO 7051; -- cross-recessed countersunk flat head drilling screws according to ISO 15482; -- cross-recessed countersunk raised head drilling screws according to ISO 15483; -- hexalobular socket countersunk raised head screws according to ISO 14584; -- hexalobular socket countersunk flat head tapping screws according to ISO 14586; -- hexalobular socket countersunk raised head tapping screws according to ISO 14587.