12-14 x 1 Phillips Flat Self Drilling Screw Full Thread Zinc & Bake 2-12 It has a nylon insert

It has a nylon insert that provides a locking action to prevent the nut from loosening due to vibration or movement

eliminating the need for additional countersinking

This 1/4-20 x 5/8 Phillips round machine screw is fully threaded and made of zinc-plated steel

It is also heat treated for increased strength and hardness

12-14 x 1 Phillips Flat Self Drilling Screw Full Thread Zinc & Bake 2-12 It has a nylon insertThese 12 14 x 1 Phillips flat self drilling screws are designed for fast and easy installation into metal surfaces. Made from durable steel, they feature a zinc and bake coating for corrosion resistance. The self drilling tip eliminates the need for pre drilling, saving time and effort. The flat head provides a flush finish, making them ideal for applications where a low profile is desired. These screws are suitable for a wide range of projects,