Q:I'm talking about another thing

crews for the daily life of indispensable industrial necessities: such as cameras, glasses, watches, electronics and other small screws used; television, electrical products, musical instruments, furniture and other general screws; as works, construction, bridges are large Screws, nuts; transport equipment, aircraft, trams, cars, etc. are the size of the screw and use. Screws have an important task in industry, and as long as there is industry on earth, the function of screws is always important. Screw is thousands of years of people in the production of common inventions, according to the application field, it is the first major inventions of mankind.

Q:The idiom of the screw

Lei Feng: I would like to always make a screw, a person's role, for the cause of the revolution, as a machine on a screw machine as a result of the many screws and fixed, only to become a solid whole, can Run freely, play its great ability to work. Although the screw is small, its role is not underestimated. I would like to make a screw hello forever. Screw to regular maintenance and cleaning, it will not rust. People's thinking is the case, to always check will not go wrong

Q:A194 GR3 is what style fasteners

ASTM A194 is high pressure and, or high temperature conditions with the bolt to match the carbon steel and alloy steel nuts, as GR3 I did not see such a description in the standard

Q:Nominal diameter 12 washers, outside diameter?

flat washer is usually thin pieces, with different shapes are used to reduce friction, prevent leakage, isolation, to prevent loosening or dispersed pressure.Flat washer is mainly used to decrease the pressure, when some parts of the screw down the axial force is very big, easy to make the pressing dish washer, then can use material and improve the hardness to solve.

Q:How to look at screw models

When you buy a certificate. The The Written above. The The I do not know any other way

Q:Engineering argument, usually referred to as the M3 screw, M refers to what is the meaning? The Please instruct the engineering staff.

International Metric Thread System: The national standard CNS adopts the thread. The crest is flat and easy to be turned. The tooth bottom is rounded to increase the thread strength. The thread angle is 60 degrees. The specification is expressed by M Metric thread can be divided into two kinds of coarse and fine teeth, such as M8x1.25 (M: code: 8: nominal diameter .1.25: pitch).

Q:Does the fastener include screws?

A type of fastener with no head at both ends. At the end of the connection, it must be screwed into the part with the internally threaded hole and the other end through the part with the through hole and the nut is screwed even if the two parts are fastened together. This type of connection is called a stud connection and is also a detachable connection. Mainly used for one of the connected parts of a larger thickness, requiring a compact structure or due to the frequent removal of the bolt should not be used occasions.

Q:Was rusty rust, the screwdriver are turning how to do, is a very important thing

Red: some of the top of the device screw corrosion to take shape, can not use wrenches, wire clamp discharge, both the impact method. First with a hammer and through the top of the cone in the vertical direction of the screw impact of a v-shaped groove. Then, adjust the chuck angle, along the direction of the screw out of the impact, see Figure 2. To be loose, you can use the wire clamp to screw out the screw. "A" or "ten" when the screw slide, you can also use this method, combined with the wire clamp screw out the screw.

Q:How to remove the broken screw?

When the screw is broken, if a part is exposed, it can be screwed out with the appropriate pliers, or a square nut is welded to the broken screw to screw out the dowel screw.

Q:For example, some people ask us to assemble the time zone of the flat washers of the positive and negative side, I would like to ask the installation of flat washers have positive and negative points? If yes, how to distinguish?

In fact, the reason is very simple, smooth side in the beautiful, no corners in the next, the pressure is small, small damage to the workpiece.