Self-tapping screw refers to a screw that forms or cuts its own threads within a pre-drilled hole. Eg:- #14 Type A Metal Self-tapping Screw, HH, 304 Stainless | TA-S3-14  Key Features: Requires a pilot hole prior to installation Threads are formed as the screw is inserted Offered in both thread-cutting and thread-forming varieties Suitable for Wood, plastic, thin metal Self drilling screw (TEK screw) is a type of screw that can create its own hole and tap threads in a singl