Countersunk (CSK) self taping screw is flat head screw with cone shape under the head. Self-tapping screws are fasteners that are designed to tap their own hole as they are screwed into wood, plastic or metal. Flat head self tapping screw or counter sunk head (CSK) self tapping screw is used, where precisely fitted threads are required. Self-tapping screws are ideal for items that require regular maintenance and work well when working with two different kinds of material being fastened together.
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