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18-8 Stainless Steel Thread Cutting Screw, Plain Finish, 82 Degree Flat Head, Phillips Drive, Type 25, #12-14 Thread Size, 1/2' Length (Pack of 25): Industrial & Scientific. 18-8 Stainless Steel Thread Cutting Screw, Plain Finish, 82 Degree Flat Head, Phillips Drive, Type 25, #12-14 Thread Size, 1/2" Length (Pack of 25): Industrial & Scientific. The 18-8 stainless steel thread cutting screw has a plain finish, a Type 25 point style, and an 82-degree flat head with a Phillips drive. The screw, also called a type BT thread cutting screw, has coarse threads and is suitable for use with plastics and other soft materials. The type 25 point tapers down to a blunt edge and directs chips out of the hole to prevent clogging. The large cutting surface enables screw installation with minimal rotating force. The 18-8 stainless steel material provides strength and offers good corrosion resistance in many environments. The material may be slightly magnetic. The flat head has an 82-degree cone-shaped bearing surface for use in countersunk holes and a flat top that fits flush with the mated surface. The Phillips drive has an x-shaped slot that accepts a Phillips driver and is designed to allow the driver to slip out of the head to help prevent over-tightening and damage to the thread or fastener.。Thread cutting and thread rolling screws, two types of self-tapping screws, are threaded fasteners that create a mating thread in the wall of a hole. The two screws differ from each other in the way that they create the threads. Thread cutting screws cut the wall of the hole to create the thread, creating material chips that need to be cleared away from the hole to prevent clogging. Thread rolling screws, also called thread forming screws, do not remove material but instead press against the wall of the hole to displace the material and form the threads.。 。 。 。