Because of its self forming or tapping the thread matching it, it has high anti loosing ability in combination and can be disassembled. In the small screw, its size, thread type, head type, drilling performance, in the engineering use of high tension, single, unilateral combination features almost unlimited. Self tapping materials can be divided into carbon steel and stainless steel, of which 1022 medium carbon steel is the main material.
1: According to the different head, it can be divided into: round head, flat head (i.e. countersunk head), top stigma, round top wide side head, big round head (i.e. big flat head), hexagon bearing hole head, hexagon bearing hole Huasi head, hexagon bearing hole Huasi head Self Tapping Screws,Cross Self Tapping Screws,Big Head Self Tapping Screws,Phillips Pan Head Self Tapping Screws Suzhou Gubao Screws Co.,Ltd. , https://www.hongyiscrew.com
Witnessed: the earthen ridge became a horse cell
At 8 o'clock on the morning of November 16, the reporter, under the leadership of the informed masses, found this ridiculous gap that has been bruised and bruised. Going all the way, the scene in the gully is shocking: on the slopes on both sides of the gully, there are black holes in the mine mouth. The average distance between the mines is only tens of meters. The intensity is incredible. It looks like a horse cell. Some of these mines have already produced ore, and they have piled up a platform at the entrance; others are just after excavation, and the cave is filled with fresh soil. The vegetation was severely damaged in the entire ditch.
During the walk, there will be several deep and large pits. "Where there are ore, they will dig there. These pits are left by mining people." A passing miner told reporters.
In the interview, a miner told reporters that it is not complicated to open a mine here. Just say hello to the village and pay some money to the village. Although the mines here do not have any formalities, they can be exploited publicly if they pay the money. There will be no government departments to check them. He also told reporters that the current bauxite mine is about four to five hundred yuan a ton, each mine can produce about 100 tons of ore under normal conditions, and can earn four or five thousand yuan a day.
In the interview, a villager who knew the inside story revealed to reporters a more surprising insider than the appearance. According to reports, in this gully of Chengtou Village, there were originally only 13 illegal mines. In November last year, a deputy head of the village called Miao Shuangwu in the town of Potou called a mine boss to ask the mine owner to manage the name of “Beijing Xintai Mining†according to the standard of 300,000 yuan per year and another 100 yuan per ton of ore. The company that consults the company "pays the "management consulting fee", can pay for the production, and does not pay the money." The matter was handled personally by Miao Shuangwu, deputy head of the township and director of the township enterprise office, Cui Baichao. It was from that time that the bauxite mines here suddenly increased, and now it has reached 108.
The villager said that the background of this Xintai company is unclear. It is not clear why it is possible to collect money from Henan, but the power is very large. As long as the company pays the money and gets a receipt, these illegal mines that have no formalities can be exploited openly and there will be no government departments to check. There are several mines that think that it is not unreasonable to pay the name of Xintai Company, and there is no formality, no insurance, no willingness to pay, and the result is that it will not work.
The villagers also said that this year, Xintai Company said that it had also circled two or three hundred million yuan, but whoever eventually entered the pocket of money, no one can say it. However, outside analysis, behind the Xintai company, there must be strong government support.
According to reports, Xintai Company opened several rooms on the third floor of the Golden Rose Hotel in Dianchi County, and the mine owners went there to pay. The reporter came to the hotel to inquire, from the main station to the waiter, but no one heard of the name Xintai Company.
Later that afternoon, the reporter went to the Potou Township Government for an interview. The office staff told the reporter that the main leaders in the township had gone to the county to meet, not at home. Later, he dialed Cui Baichao’s mobile phone. Cui said that he was inspecting the work in Chengtou Village and was not in an interview.
Round head: it is the most commonly used head shape in the past
Flat head: it can replace the new design of round head and mushroom head. The head is low in diameter, and the peripheral circumference of the head is connected with the high edge of the characteristic, which makes it play a driving role for high-strength torque. It is slightly different from the hole head in head shape
Top column head: the diameter of the standard flat round top column head is smaller than that of the round head, but it is higher due to the groove depth. The smaller diameter increases the pressure acting on a small area, and can be closely combined with the flange and the increased surface layer. As the head is made in the drilling die set to ensure the concentration, they can be successfully applied to the holes in the internal drilling
Dome wide side head: due to the undercutting of the head to restrain and reduce the wear of the wire components, it is most commonly used in electrical appliances and tape recorders, providing an attractive design type for the middle and low head type with its more sufficient bearing surface
Big round head: also known as oval top wide edge head, is a low type, cleverly designed large diameter head. When the combined tolerance of additional function allows, it can be used to cover the metal plate hole with larger diameter. It can also be recommended to use flat head instead
Hexagon socket head: a kind of joint with the height of wrench head and the size of hexagon head. The hexagon is completely cold formed by the reverse hole mold, and there is an obvious depression at the top of the head
Hexagon socket head: such as the standard hexagon socket head, but at the same time, there is a socket face on the base of the head to protect the assembly from damage of the wrench. Sometimes the function of things is far more important than appearance
Hexagon head: This is a standard type of torque acting on the hexagon head. It has the feature of trimming sharp corners close to the tolerance range. It can be recommended for general commercial use. It can also be applied to various standard patterns and various thread diameters. Because of its necessary second process, it is more expensive than general hexagon socket
2: According to the groove type, there are four types: slotted head type (also called slotting), cross slotted head type, cross slotted head type, cross slotted compound slotted head type and meter slotted head type
3: According to the standard can be divided into: GB, DIN, ANSI, BS
Illegal Bauxite Mine in Potou Township, Dianchi County, Henan Province
In a waste ditch near Chengtou Village, Potou Township, Dianchi County, there are more than 100 illegal bauxite mines without any formalities to steal valuable bauxite resources 24 hours a day. According to insiders, under the guidance of the township government, each mine port needs to pay a so-called mysterious enterprise called “Beijing Xintai Mining Management Consulting Co., Ltd.†according to the standard of 300,000 yuan per year and 100 yuan per ton of ore. The "management consulting fee" can be produced. In just one year, the company has already collected hundreds of millions of yuan. What is the background of this company? Where did the money finally flow? It is currently a mystery.