Almost everyone who was holding a screwdriver or hammer, knows what a fastener.This definition fits any metal object that allows to interconnect two parts.In this list there are sufficiently large bolts, screws, bolts, anchors, nuts, washers and many different hardware.All of them are widely used in industry.
Any fastener applies to a particular group: construction, furniture, train, automobile, or a group of general application.Each variant has its own additional division.The most diverse construction fasteners.These include bolts, screws, washers ... in short, everything that we use when collecting their own hands shelf for books or desks.
All hardware must meet certain requirements.There are many different standards, which shows the characteristics for products fixing.GOST 27017-86 describes the types and names of all types of hardware.And then, each product has its own standard, which specifies all the requirements.
Any fastener related to metal products, made of metal.This may be brass, carbon steel or stainless steel.If necessary, apply an additional coating to protect the metal from corrosion.But allows the use of hardware and without the protective layer.Often you can see the self-tapping screws or black - it is oxidized or coated phosphated coating.More attractive looks fasteners, further processed dip galvanized.
All construction hardware can be divided into several groups.Let us consider each separately.
Metric fasteners
This group includes all kinds of screws, bolts, studs, nuts and washers.They serve for direct plug-in connection parts.Manufacture of fasteners includes compliance with external threads on the screw or bolt-female nuts.Therefore, for each size has its own mate.Washer helps further secure coupler.
Anchor fasteners
These include hardware that are used at high loads.This fastener is used when you need to tightly secure the building structure, such as a window or a flight of stairs.The anchor consists of two elements.The most important part of the spacer.It was she, ranging from stress, allows to keep the entire structure.Individual items are chemical anchor.This hardware is often used when installing ladders.It is based on filling the voids hardening component.
dowel fasteners
It is used for the walls, when you want to hang a heavy object.In the prepared hole anchor is inserted first, and then the screw is screwed.It turns out quite rigid attachment.Today dowels are made (mostly) made of plastic or other similar material.
Self
It differs from the fastener screws and bolts thread, which allows to cut an internal thread in the details.Widely used in construction.Available for different types of materials.Screws for gypsum plasterboard or wood should not be used when working with plastic or metal.
Screws
have the same operating principle as the screws, but are used for softer materials.Rod half coated thread made of less hard metal.
Rivets
Used for permanent connection details.They are used in various fields, in the manufacture of furniture and even in the rail industry.
All fasteners have their strength class.On it you can judge where best to use the product.In appearance, screws, bolts, screws and screws are very similar.They have the head of different shapes and rod, which completely or partially coated thread.Screws and screw end with a pointed end, with which the said products and are screwed into the material.The shape of the head can be semi-circular, flat, square, hexagonal, countersunk or countersunk.For the convenience of screwing on the cap cut into special slots in the form krestovinki or bands.Sometimes, in order to make protection more nonstandard slots which require the use of special tools.
