In part one, we discussed the different types of screw heads and why there are so many. But now, it’s time to focus on screw point types.
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Much like custom screw heads, there are a bunch of different types of points that come from a screw manufacturer. Each has a different purpose and belongs to different groups. Let’s take a look at a few of them.
Thread Cutting
There are five types of thread cutting screws that are used in different ways. First, a screw with a single flute creates a fine machine thread. This is used for field replacement. Next, one with a coarse tapping thread and a really long, sharp point is used for capturing chips. A screw with maximum tightening torques is perfect for chip clearing.
There are some that are pretty much identical to those with the maximum tightening torques. However, they have a coarse Type B thread. These are used for plastics and other soft materials. Finally, we have the screw with a machine screw thread and a blunt tapered point. This is used primarily for heavy metals.
Tapping
There are three types of tapping screws out there. First, a generic tool with far apart grips and a thin thread is used to cut through thin metals. While it’s useful, it’s not recommended for use with new designs. Next, we have a screw that is much like the first. However, this one has a wider body but still has a point. This is used for any standard project. Finally, we have one with a larger body but no firm point. This works best with heavier, thicker metals.
Thread Forming
The first screw of this grouping has a coarse or fine pitch machine screw thread. This one is perfect with heavier metals and does a good job of aligning sheet metals. Another type is one that also has a fine or coarse pitch machine screw thread, but has a blunt top. This one also works well with heavier metals. Finally, we have a one that is usually coarse in machine screw threads. This provides the best strip-to-drive ratios.
The concept of the tool dates back to about 200 B.C., so they have a long history behind them. Now that you know all about the heads and points, you know that each has a different purpose. Their purposes differ depending on the project and the custom screws. Keep these in mind when it comes times for your next project.