Cross-grooved countersunk head screws are of the class of screws that have flat heads, countersunk heads, or semi-submerged heads.
Countersunk head screws may also be called flat head screws, countersunk head screws, half sunk head screws, half sunk head screws.
General countersunk head screws are cross - grooved.
Countersunk head screws are M2, M3, M4, M5, M6 and M8. This refers to the diameter of countersunk head screws.
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