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Sheet Metal Flat Head Countersunk Metal Hooks Stainless Steel Driver Self Tapping Screws

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Self-tapping screws are usually described by screw diameter series, screw number per inch length and screw length. There are 10 and 12 screw diameter series, the corresponding screw diameter is 4.87mm and 5.43mm respectively; There are 14, 16 and 24 threads per inch. The more threads per inch, the better the self-drilling capability.

Tapping screws combine taps with bolts. The front is the tap, the back is the thread. In general soft materials, drill a hole can be directly screwed into. Tap the thread from the tap, followed by the bolt thread. If the screw diameter is small, the material is also very soft. You don't even have to punch a hole first, like screw it into a piece of wood.

Self-tapping screw is a screw with a drill bit. Hex socket bolts are constructed by special power tools, drilling, tapping, fixing and locking are completed at one time.

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