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Hex Flange Self Drilling Screw screw-in test: screw the self-tapping self-drilling screw into a steel plate with a reserved test hole, the Hex Flange Self Drilling Screw should form a matching thread in the test plate, and the thread of the screw itself No deformation or damage occurs until the end taper thread completely passes the test plate. The screw-in test is only applicable to AB, B, BP and other types of self-tapping and self-drilling screws.