Fasteners: screws and anchors

Self - this is the form of fasteners meet the definition of "screw", but with significant design improvements (primarily a form of thread, tip and slot), made from high quality materials with different corrosion resistant and aesthetic coatings. These improvements can often apply the screws without pre-drilling holes (which greatly simplifies and speeds up the editing process secured with products), and also used for fixing to a metal (aluminum, steel, etc.) basis, and in building materials (concrete, brick, etc. .). Self substantially broadened the scope of screws, significantly influenced the technology of many construction and mechanical assembly work. The essence of the screws lies in the fact that they cut into his groove. Their proper names - samonarez (he cuts) but in the minds of the builders, they established themselves as just tapping. Screws (from the German Schraube - Screw). This is a screw for fastening wooden parts. Tapered rod with a screw thread and the head, which is usually made of a slot (slot) for a screwdriver. Screws are manufactured in accordance with GOST 27017-86 - Fasteners in the form of a rod with a special outer thread threaded conical end and head at the other end, forming a thread in the opening connectable wooden or plastic products. Determination of Standard assumes that the screw is screwed in a pre-prepared hole and is used for mounting on wooden or plastic bases. These screws are usually made of low carbon steels (St1, St2, St3, 10kp) without coating, at least from korozionnostoykih steels (also brass). Traditionally produced and manufactured mainly domestic hardware industry today, and I'm hot now on the market thoroughly presented and Chinese manufacturers of screws. As a conclusion: the difference between the Screws found that the screws - is mounting for the tree, and they require pre-drilled holes and screws are suitable for more durable materials (concrete, walls, etc.) and do not always have to drill.