Mechanical fasteners can have different purposes and perform a variety of tasks - from simply forming the integrity of the structure to the perception of the main load-bearing force on the structure. The greater the load on the fastener, the higher its strength must be.
Depending on the purpose and application, Scrooz fasteners are made of different strength classes, respectively, different steel grades. There is no need to use high-strength bolts to fix, say, a canopy on the kiosk, and vice versa - it is unacceptable to use bolts of ordinary, low, strength class in critical designs of the tower or gantry cranes - there are exclusively high-strength bolts from here and people name such bolts "crane bolts". The desire to save money and use conventional bolts - cheaper, or "crane bolts," but made of low-strength steel, leads to the spectacular news on television with a falling crane in the spotlight.
For different types of fasteners (bolts, screws, nuts, studs) different steels are used, different strength classes, and different markings.
Bolts, screws, and studs:
Bolts, screws, and studs are made from different carbon steels - different steels correspond to different strength classes. Although, sometimes it is possible to make bolts of different strength classes from the same steel, using different methods of billet processing or additional heat treatment - hardening.
For example, steel 35 can be used for making bolts in several strength classes: strength class 5.6 - if the bolts are manufactured by turning on a lathe and milling machine: classes 6.6 and 6.8 - obtained by volume pressing on a drawing press; and class 8.8 - if the bolts obtained by these methods are subjected to heat treatment - hardening.
The strength class of bolts, screws, and studs made of carbon steel is indicated by two digits separated by a point. The approved transparent series for bolts, screws and studs of carbon steels contains 11 strength classes: 3.6; 4.6; 4.8; 5.6; 5.8; 6.6; 6.8; 8.8; 9.8; 10.9; 12.9
What is the difference between bolts and screws:
The most common hardware products are bolts, screws, and screws. They allow you to effortlessly create a variety of connections. The main task of these metal products is to connect two or more parts. It should be noted that the connection can be movable and fixed (rigid). The main feature is that this does not require special training and expensive tools.
If everyone can distinguish the screw from the bolt, the bolts from the screws do not differ much and there is confusion in terms. Many people think that a bolt must have a hexagonal head, while screws have a semi-circular or secret head and are tightened with a screwdriver. The difference between them is vague and does not always coincide with the general opinion. Structurally, a bolt and a screw have the same parts:
- The threaded rod;
- head;
How to fix the decking on the roof with screws?
To install the outer surface of the roof most often used corrugated board. To make the roof well protected from rain, snow, and wind, special attention should be paid to the selection of roofing material and suitable screws for it, as well as their correct screwing. Good fasteners do not destroy the coating, firmly fix the sheet material, and do not allow moisture. Consider how to properly fasten the decking on the roof with screws to the roof to the weather and last for years.
For metal and wooden battens: how to distinguish the drill:
Before figuring out how to fix profiled sheeting on the roof with self-tapping screws, you first need to choose the right size hardware with a certain type of tip. The right choice depends on the material of the crate - it is made of wood and metal. Fasteners for both options are equipped with a hexagonal head and a steel rod with a thread. They are made of strong galvanized steel with a corrosion protection coating.
Choice of fasteners for quality fastening
For the flawless operation of the roof for many years, you need to use the right self-tapping screws designed for profiled sheeting. Their main advantages are:
- moisture resistance - galvanized products do not rust, do not deteriorate, and do not spoil the roof;
- Temperature resistance - can withstand temperature extremes, do not lose their properties to frost and ultraviolet;
- protection against moisture penetration - equipped with a washer with a rubber gasket for hole sealing;
- creating a secure connection - tightly fixed and hold the decking in position.
Roof screws are selected in color with the sheets, where they are screwed with a tool. Fasteners ensure air-tightness and tightness of corrugated board to the wooden elements of the structure.
Conclusion:
As you can see they are completely identical and it is very easy to get confused. However, when it comes to technical terms, it is required to be as accurate as possible so that it does not lead to confusion and errors. Let's examine each type of metalware separately and find their principal differences, which will help you easily assign them to one group or another.