Self Tapping Screws

Self Tapping Screws :

Self-tapping screws are a type of fastener with a unique feature. They work by tapping their own threads in materials like plastic, wood, and metal. Self-tapping screws are split into two main categories, Thread-Forming and Thread-Cutting. The screws are similar in the job they do; however, they have two differences. One of the screws has a flat base, the other has a sharp point.

The difference between self-tapping and self-drilling fasteners is that self-tapping screws will tap a hole into a soft material, self-drilling screws can drill a hole into anything from metal to wood meaning no pilot hole is needed.

Types :

Tapping Style : It's worth noting that both self-tapping screws and self-drilling screws have a few different versions of thread creation. Specifically, you may encounter:

Thread-forming screws : The unique thread design on thread-forming screws displaces the material around the screw rather than cutting or removing it. They have shallower threads, placed closer together, than thread-cutting screws.

Thread-cutting screws : The threads on thread-cutting screws are sharp and distinct, allowing them to cut into the material and create distinct threads.

Thread rolling screws : This type of screw has helical ridges that are perfectly spaced according to a geometric construct. Rather than cutting or displacing the material, it rolls the material away from the screws.

Head Styles :

Flat : As the name suggests, flat-head self-tapping screws have a flattened profile from above. They're ideal for projects where the screw head should be flush with the surface of the project, or not protrude at all. For this reason, we also call them countersunk screws, since it has the same effect as when you countersink the project to make room for the screw head.

Hex Washer : Hexagonal, Hex head, or hex washer screws have a much larger head than most of the other types. The enlarged head, along with the security provided by the hex shape, allows you to apply much more torque while simultaneously reducing the potential for stripping the screws.

Round : The surfaces are fully rounded on round-top self-tapping screws, giving them a more polished appearance. They're ideal for plumbing and electrical applications, as well as any other applications that require ready access to the screws.

Oval : Oval head self-tapping screws are slightly wider than round-head screws, giving them more surface area. Because of the increased surface area, they have a larger area of engagement. Additionally, they're more appealing visually, making them ideal for applications requiring practicality and aesthetics.

Pan : Pan-head self-tapping screws have a rounded surface, much like the round-head screws. However, they're slightly convex. They have a larger surface area, ensuring that the screwdriver has more space to engage with. This type of self-tapping screw is ideal for many applications since the enlarged surface area helps prevent slippage during installation

Truss : Truss-head self-tapping screws have an increased bearing surface due to their low-profile wide heads. This makes them ideal for applications requiring heavy-duty bearing, or for attaching metal to metal.