Need wood screws guide holes

Save work and material with flat head screws

Do you want to build a pergola? Sure, this is a good idea if you want to enter the garage without getting your feet wet. I know that the pergola is actually open at the top, but with a bit of plexiglass as a roof, the pergola also looks good, especially if it is nicely covered with a few plants. Or are you not ready yet, but want to have the carport ready first? Also good, but in any case you need materials and accessories that connect the various wooden elements securely and firmly. In the last blog post we already told you a lot about the heavy-duty angles that can be used for such purposes. In many cases, the heavy-duty brackets can also be supported or even replaced entirely. So today it's about the best screw connections for such a project.

Have you already heard of the Washer head screws belongs?

As always in the craft sector, the flat head screws are known under different names. They are also known as Rafter screws or construction screws. In colloquial language in construction or among craftsmen, they are often called engineering nails. This already indicates the purposes for which they are particularly well suited.


The properties of the washer head screws

Flat head screws or rafter screws have special properties that enable them to connect wooden parts tightly and firmly with each other with great tensile force. These properties require more effort to manufacture, which is why the washer head screws are not exactly cheap. But you can rely on them rock solid, they make the job easier, and you can easily save a large number of other screws with a few of them. Here come the properties that can also be found in other screws, but in this connection only occur in the washer head screws.

The sizes of the washer head bolts

are usually quite long, but rather thin screws. They are also available in a 10mm diameter, but then they are real Kawenzmanns, for whom you need a really good device for screwing. A typical oneWasher head screw has e.g. 6 x 120 mm, but there are also sizes up to 10 x 300 mm. This allows you to drive the screws very far into the wood and create a strong connection.

The shape of the washer head bolts

You can always recognize the flat head screws by their flat plate at the tip of the head. It is of course round and only a few millimeters thick. Nevertheless, this plate is very well connected to the screw, nothing tears off that quickly. The plate does the same thing for the screws as a washer. He increases the number of copies on the wood. This allows the screw to be tightened very firmly, also because the plate is more stable than most washers. In addition, the plate head can be sunk very easily into the surface of the wood or is almost flush with the surface. Not only does it look good, it also protects against injuries.

The drive of the flat head screws

There areWasher head screws also with a normal Phillips drive, but you should keep your hands off that. You've probably heard of the Torx drive. It's a smart thing. This patented drive, which is protected by the name, has the shape of a round recess in the screw head with six small notches. Hence it is called Torx drive for the flat head screws also six-round drive. The special bits for this are relatively flat, but fit exactly into the Torx opening. The combination of round and square allows a very high power transmission and thus a very high torque. In connection with the plate head, this results in perfect durability.

The thread of the flat head screws

The flat head screws have a special thread that is on the one hand quite wide in relation to the screw thickness, on the other hand has a relatively large distance between the turns and, on the other hand, has very sharp edges. This means that the flat head screw digs into the wood more easily. But that is still supported.

The drill head with the cutting notch and the end mill

If you have a lot of screws to set, you don't necessarily want to laboriously pre-drill. The Washer head screws have a specially designed tip. A notch in the tip lets the chips of the wood produced when screwing in to the rear and thus prevents the wood from splitting due to the pressure. The end mill, on the other hand, with its slightly inclined milling ribs, ensures that the tip of the screw creates a relatively wide hole into which the screw body can be screwed with less effort. In connection with the cutting thread you can penetrate so much deeper into the wood than with normal wood screws. But it is clear that you should try this technique a few times before you actually use it to connect your wooden parts.

The material of the washer head screws

The flat head screws have to withstand a lot and their design, stability and durability must be guaranteed. Therefore, as for many load-bearing elements in the construction industry, there are official approval rules or certifications. You should definitely pay attention to this. If a screw has an ETA approval, it has been tested and you can rely on it. There are plate head screws made of galvanized steel and stainless steel. The galvanized steel is quite safe, but galvanizing alone does not protect against corrosion forever, especially in damp rooms or on the coast. The stainless steel is safer, but these screws are not only expensive, they are also a little softer and therefore unsuitable for some loads. With the EisenRon you will find a third variant. Our flat head screws are also passivated. This is a technical term from materials technology and means a special coating made of chrome or a similar precious metal. You can recognize the passivation by the bluish shimmer. The top layer of the screw reacts with the oxygen, but in this connection it is so saturated that it then becomes passive, so to speak, and does not advance any further. So you have an ideal mix of hardness and corrosion resistance.

So it's better to use a few good pan head screws than a bunch of the regular countersunk head screws. Of course, here too, if you have any doubts, you will need professional advice. We can only provide general information here, as we are not with you on the construction site. In any case, we wish you a lot of fun and success with your building project!