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Hexagon Nut Specifications, Hexagon Nut Specification Table
2018-05
Hexagon Nut Specification Reference Standard GB/T90-1985 Fastener acceptance inspection, marking and packaging (EQV ISO3269:1984) GB/T196-1981 Ordinary thread, basic size (diameter 1~600mm) GB/T197-1981 Ordinary thread, tolerance and fit (diameter 1~355mm) GB/T1237-2000 Fastener marking method (EQV ISO 8991:1986)
In the third quarter, my country's fastener import and export value was 2.05 billion US dollars
According to statistics from China Customs, in the third quarter of 2017, the total import and export value of fasteners in my country was 2.05 billion US dollars, an increase of 6.2% over the same period last year (the same below); the total import and export volume was 784,400 tons, a decrease of 4.7% over the same period last year.
The "Encyclopedia" of the standard parts industry and the "Yongnian Standard Parts Chronicle" were published
A few days ago, after 2 years, the printing of the Yongnian Standard Records, divided into upper, middle and lower volumes, was completed and officially published. This encyclopedia of the standard parts industry records the development history of China's fastener capital for more than 50 years, and also witnesses the economic development process of my country's reform and opening up.
Reasons for the phenomenon of thread slippage in the drill tail screw
Whether it is a drill tail screw or other screws, there will be a phenomenon of slippage. We all know this situation, and the problem is to find out the cause.
How to use expansion bolts
The fixation of the expansion screw is to use the trapezoidal slope to make the expansion produce a lot of friction, knowing that the desired fixing effect can be achieved. Generally, the expansion screws we use are divided into two types: iron and plastic.
Classification method of corrosion of stainless steel nuts
In a corrosive environment, the damage of the metal and the surrounding medium due to chemical or electrochemical action is called corrosion. In a corrosive environment, when the stainless steel is not selected properly, corrosion will also occur. Corrosion is classified as follows:
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