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How to choose the screws for window and door installation?

What screws are generally used for window and door installation?

The types of screws commonly used in window and door installation are generally expansion screws, self-tapping screws, and self-drilling (drill tail) screws.

  1. Expansion screws. The external set of an expansion tube uses the movement of the thread so that the expansion parts “open, the outer drum” so that the formation of the pressure achieves a fixed role.
2.Expansion screw
  1. Self-tapping screws. which have a sharp head, can be fixed by their own screws, the body “drilling, squeezing, pressing, tapping” out of the corresponding threads, so that they are closely connected to each other.
  2. Self-drilling screws. Also called self-tapping self-drilling / drilling/dovetail screws, etc., compared to self-tapping screws, its head is a blade-like tail, so it can be tapped directly into the fixed body without the premise of pre-drilling.

How to choose the type of screws for windows and doors?

Although windows and doors may use a lot of screws, but if the focus is on the installation, then mainly in the window and door frame fixed, as well as hardware installation will use the screw products.

When fixing window and door frames, usually larger size (longer length, larger diameter) expansion screws or self-tapping screws are used, and as long as the product and construction are reliable from a safety point of view, both types of products can be chosen.

of course, there are some special circumstances when fixing the window and door frame, mainly when the wall is red brick, porous brick, aerated brick, it is not recommended to choose expansion screws.

hardware installation (slide brace), usually with the size of the slotted hole self-tapping screws or self-drilling screws, both types of products can be selected, only self-drilling screws are more convenient to use.

How to choose a screw?

From the screw material, and specifications (size), to the screw shape, and thread, the choice of screw products is also concerned with.

a, the first is mentioned in the previous article to the screw material as far as possible to choose stainless steel, most of which preferred 304 stainless steel, coastal cities choose 316 stainless steel, doors and windows to connect part of the wall thickness is very thick or high strength scenarios choose 410 stainless steel material.

b, on the expansion screw is the choice of nylon casing or the kind of stainless steel pull-out screws, small knowledge of personal advice is that as long as the main body of the screw is not carbon steel but stainless steel can actually, of course, have a budget stainless steel pull-out size is larger, security is relatively more secure.

Fig. left stainless steel pull-out, fig. right nylon sleeve expansion;

c, in addition to the material, the second important screw is the specification (size), the larger the specification, relatively speaking, the screw for the fixed body to provide “fixed force” is also greater. Take nylon expansion casing screws for example, the common sizes are 6/8 * 60/80/100 (in mm), 10 * 80/100/120 etc. and stainless steel expansion screws are 10 * 70/90/110 etc.

Window and door frame fixing screws are recommended to choose 8 – 10 * 80 – 100 specifications, the diameter of the large embedded in the depth of the fixed body is also enough.

d, in the hardware (slide brace) installation screw selection, in addition to the material should also consider the specifications, the general slide brace screw hole size of about 5 mm, so the screw diameter should be selected about 4.8 mm, 3 or 4 mm or so diameter screws are easy to leave a security risk.

In addition, the sliding brace should also consider the problem of screw loosening (the wall thickness of the hardware is so small that the screw threads are not tightened easily), so it is recommended to choose fine teeth (screw threads are more “tight”) of self-tapping or self-drilling screws.

Figure left coarse-tooth self-drilling screws, figure right fine-tooth self-drilling screws;

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