Screw is a tool to tighten instruments and parts step by step by using the physical and mathematical principles of circular rotation and friction of the inclined plane of an object. Drill tail screw is a kind of wood screw with a self-tapping bit at the front end. Drill tail screw is a new invention of people in recent years, also called self-tapping screw.
The connection between the main bars requires ordinary or high-strength bolts, and the plates are connected with self-tapping nails. It cannot be used for metal-to-metal bonding.
Extended data
Drill tail screw is a new invention in recent years. Screw is a general term for fasteners.
The tail of the drill tail screw is in the shape of drill tail or sharp tail, which can directly drill holes in the setting material and basic material without auxiliary processing. Tapping and locking can greatly save construction time. Compared with ordinary screws, it has higher toughness and retention, and will not loosen after long-term combination. It is simple to use safe drilling and tapping to complete the operation at one time.
Usage: It is a kind of screw, which is mainly used to fix the color steel tile of steel structure and also used to fix the thin plate of simple building. It cannot be used for metal-to-metal bonding.
Material and model
There are two kinds of materials: iron and stainless steel, among which stainless steel is divided into many kinds of materials.
The models are: Φ 4.2/Φ 4.8/Φ 5.5/Φ 6.3mm, and the specific length can be agreed upon according to the requirements.
According to the different drill tails, it can be divided into:
Round head rice/cross/plum blossom, countersunk head (flat head)/meter/cross/plum blossom, hexagonal filament, round head filament (large flat head), horn head, etc.
Screw is a tool to tighten instruments and parts step by step by using the physical and mathematical principles of circular rotation and friction of the inclined plane of an object. Screw is a general term for fasteners.
Screws are indispensable industrial necessities in daily life, such as tiny screws used in cameras, glasses, clocks and watches, electronic products, etc. Universal screws for TV sets, electrical products, musical instruments, furniture, etc. As for projects, buildings and bridges, large screws and nuts are used; Transportation equipment, airplanes, trams, cars, etc. There are both large and small screws.
Screw plays an important role in industry. As long as there is industry on the earth, the role of screws will always be important. Screw is the same invention in people's production and life for thousands of years. According to the application field, it is the first invention of mankind.
The first person to describe the spiral was the Greek scientist Archimedes (about 287 BC-2 BC12 BC). Archimedean spiral is a huge spiral in a wooden cylinder, which is used to lift water from one floor to another and irrigate fields.
The real inventor may not be Archimedes himself. Maybe he just described something that already exists. It may have been designed by craftsmen in ancient Egypt, using irrigation on both sides of the Nile.
In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture with wooden buildings. /kloc-In the 6th century, nail makers began to produce nails with spiral lines, which can connect things more firmly. This is a small step from this nail to the screw.
Around A.D. 1550, the earliest metal nuts and bolts as fasteners appeared in Europe, all of which were made by hand on simple wooden lathe.
Screwdrivers (screwdrivers) appear around London 1780. Carpenters have found that tightening screws with a screwdriver can fix things better than beating them with a hammer, especially when fine-grained screws are involved.
1797, Maudslay invented the all-metal precision screw lathe in London. The following year, Wilkinson made a nut and bolt making machine in the United States. Both machines can produce universal nuts and bolts. Screws are very popular as fixing parts because a cheap production method has been found at that time.
1836, Henry M. Philips applied for the patent of cross slotted head screw, which marked the great progress in the basic technology of screw. Different from the traditional slotted head screw, the edge of slotted head screw.
This design makes the screwdriver center automatically and is not easy to slide down, so it is very popular. Universal nuts and bolts can connect metal parts together. Therefore, by the19th century, wood used for making machines and building houses can be replaced by metal bolts and nuts.
The first person to describe the spiral was the Greek scientist Archimedes (about 287 BC-2 BC12 BC). Archimedean spiral is a huge spiral in a wooden cylinder, which is used to lift water from one floor to another and irrigate fields. The real inventor may not be Archimedes himself.
Maybe he just described something that already exists. It may have been designed by craftsmen in ancient Egypt, using irrigation on both sides of the Nile.
In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture with wooden buildings. /kloc-In the 6th century, nail makers began to produce nails with spiral lines, which can connect things more firmly. This is a small step from this nail to the screw.
Screwdrivers (screwdrivers) appear around London 1780. Carpenters have found that tightening screws with a screwdriver can fix things better than beating them with a hammer, especially when fine-grained screws are involved.
1797, Maudslay invented the all-metal precision screw lathe in London. The following year, Wilkinson made a nut and bolt making machine in the United States. Both machines can produce universal nuts and bolts. Screws are very popular as fixing parts because a cheap production method has been found at that time.
References:
Drill tail screw. Baidu baike