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18-8 Stainless Steel Machine Screw, Plain Finish, Truss Head, Phillips Drive, Meets ASME B18.6.3, 1/2' Length, Fully Threaded, #10-24 UNC Threads (Pack of 100): Industrial & Scientific. 18-8 Stainless Steel Machine Screw, Plain Finish, Truss Head, Phillips Drive, Meets ASME B18.6.3, 1/2" Length, Fully Threaded, #10-24 UNC Threads (Pack of 100): Industrial & Scientific. The 8-8 stainless steel machine screw has a plain finish and a truss head with a Phillips drive, and meets American Society of Mechanical Engineers ASME B8.6.3 specifications. The 8-8 stainless steel material provides strength and offers good corrosion resistance in many environments. The material may be slightly magnetic. 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. The truss head has an extra-wide low-profile domed shape for applications with minimal clearance. 。Machine screws are threaded fasteners that are typically used with nuts or drilled and tapped (threaded) holes. Machine screws are available with a variety of head shapes, which determine how the screw interacts with the mating surface, and drive styles, which determine the type of driver required to install and remove the screw.。 。 。 。