that is long enough to penetrate and grab both pieces. A screw that is too short may not be able to keep the materials fastened. A screw that is too long, on the other hand, may damage the wood on the other end.
You also want to choose the right diameter for the job as well. A screw that is too large may look unattractive or split softer, more fragile wood. On the other hand, a screw that is too small may not hold the materials well.
Heads:
Screws also have their own types of heads. They can be flat, which will allow you to countersink the screw into the material; rounded heads, which tend to be more decorative; or flanged, which eliminate the need for washers. You also have a choice in what type of drive you use on the screw. The most popular drives for contractors are:
• Hexagonal, which fits in magnetic bits and drive quickly; and
• Square, which doesn’t strip as quickly as others.
• Other less common drives include slotted, quadrex and Torx.
For the best results, chose the right screw for your application. If you’re not sure what you need, go ahead and give us a call. We’ll be more than happy to help you figure out what self tapping screw will do the job for you.