All about self-tapping screws ShSGD

It is important for every builder, repairman and just a person who is going to do something to know everything about ShSGD self-tapping screws for planken made of larch and other cases. It is required to understand the interpretation of this term and the features of the attachment. And you should also study the SRS screws 4.2x75, 3.8x51, 3.8x45 and other sizes.

ShSGD self-tapping screws are almost a universal fastening device. Their characteristic features are:

• special sharpness of the tips;
• large thread size (which is often referred to as "rare pitch");
• secret design of the head.

Since the end part is sharply sharpened, this product can be inserted into wood products without prior drilling. Although, of course, especially careful and neat people will not forget to prepare the hole - there is no direct need for that.

It also has alternative common names:

• self-tapping plasterboard-wood;
• just a self-tapping screw for wood;
• or even a self-tapping screw ГД.

All 4 names can appear in descriptions, and they are full synonyms. The main purpose of using such hardware is to attach plasterboard sheets to frame battens made of durable wood. It can also be used even for larch planken - strength and cutting ability is quite enough. Finally, you can safely install sheet plastic materials of various nature.

These screws are distinguished primarily by their size:

• 3.5x41;
• 3.8x45;
• 3.5x35;
• 3.8x51;
• 3.5x45;
• 4.2x75;
• 3.5x16;
• 3.5x70;
• 3.9x65;
• 3.9x70;
• 4.2x65;
• 4.2x90.

Depending on the length, the thread is also made in different ways:

• hardware no longer than 5.5 cm is produced with a completely cut rod;
• with a length of 6.5 to 7.5 cm, cut no more than 5 cm;
• if the rod is longer - up to 9 cm or even more (but this is rare), the cutting captures 6 cm of metal.

The content of impurities in it is strictly standardized. Alloys are selected, the strength of which has been tested by time. The surface is equipped with an anti-corrosion layer. For protection, apply:

• phosphate-based film coating;
• white zinc type;
• yellow variety of zinc layer.

Thanks to phosphates, "black" self-tapping screws are better processed with paints and varnishes. As the professionals say, adhesion is enhanced here. No wonder this is considered the best solution for painting. After applying the bitumen varnish, the protection increases and it becomes possible to use it even at high humidity.

The "yellow" type of self-tapping screws are appreciated for their amazing shine. They are used where decorative requirements for hardware are great. Zinc is applied in a layer from 4 to 20 microns. After the appearance of zinc oxide, the metal is reliably protected from subsequent oxidation. Thin galvanized rods are easier to twist, but the strength of the structure decreases, and the bearing capacity decreases.

In the overwhelming majority of cases, fastening is performed using a phosphated self-tapping screw.

This will avoid the formation of cracks during twisting, save strength. In this case, the diameter of the hole should be inferior to the section of the tip of the hardware.This is the only way to ensure screwing in and secure fastening with the retention of the attached structure.

GD self-tapping screws are suitable even for soft materials that are loose. Along with drywall and wood, it also:

• particle boards;
• MDF;
• fiber boards.

Therefore, its perfect alignment is guaranteed. It will be possible to immediately putty and apply other types of finishing coatings. For operations with the head, screwdrivers and screwdrivers are used. The main thing is that they are adapted for Ph2 cross splines.