Q:There are some screws, is installed in the electrical, power, electronic products on the material, ask how to correctly install the screws?

Expansion screw installation method to expand the screw on the ground or wall holes in the hole, with a wrench to tighten the nuts on the expansion bolts, bolts to go out, while the outside of the metal sleeve is not moving, so the bolt under the bulk of the metal Set up to keep it full of holes, this time, the expansion of the bolt on the expansion of the expansion screw is to make the duct support, hanging, bracket fixed to the wall, the floor, the column used in a special thread connection Pieces. Consists of countersunk head bolts, expansion tubes, flat washers, spring mats and hex nuts. When used, you must first use the impact of electric drill (hammer) in the fixed body on the corresponding size of the hole, then the bolt, expansion tube into the hole, tighten the nut to bolts, expansion tube, the installation and expansion between the fixed body Tight into one. Expansion of the expansion of the principle of expansion of screws is to use the pull out of the slope to promote the expansion of friction caused by clamping force, to achieve a fixed effect. Screw head is a thread, a vertebral. Outside the package of a metal, metal cylinder half of a number of incision, put them together thrown into the hole in the wall, and then lock the nut, Luo mother pull out the screw, the vertebral pull into the metal cylinder, metal cylinder was Open up, so tightly fixed on the wall, generally used for fence, rain Peng, air conditioning and other cement, brick and other materials on the fastening. But its fixation is not very reliable, if the load has a greater vibration, may be loose, it is not recommended for the installation of ceiling fans and so on.

Q:How is the screw produced

There are three types of technology: cold heading, red, turning; rolling teeth generally have four kinds of technology: rubbing teeth, rolling wire, teeth, car teeth; but our screw industry is the most common Is the beginning of the cold heading, the machine rubbing teeth, so that large output, low cost

Q:M4.8 * 25 What does it mean in screw size?

You should ask the specifications of the method should be very rare 4.8 should be more from the tapping, should not use M said, M generally said that the machine thread

Q:High-strength screw standard parts of the quality of what data

The other can be based on the corresponding use of the environment, to decide whether to accept or not accepted.

Q:Why are the screws of the screw?

The threads are divided into connecting threads and drive threads. Which in addition to connecting the thread to remove the common thread but also non-threaded sealed pipe thread, threaded thread with the thread and metric taper thread.

Q:How to look at screw models

According to the size of the outer diameter, such as the outer diameter of 6 mm, then the M6 screws. But not every millimeter has, according to a certain law.

Q:How to use washer, gasket, o-ring "

Spring washer, "casing gasket" and "Liner O-ring", in fact should also be our daily used to seal washer, gasket, O-ring

Q:Gasket 300HV relative to what material?

Due to the standard for the 100HV, 140HV flat washers can be made of low carbon steel. General enterprises in the selection of materials, most of the materials used in Baosteel, easy to cold stamping

Q:Is it hard to heat the fasteners?

Fasteners are also known as standard parts, which are mainly heat-treated according to the material of the product.

Q:The main meaning is that the design to make some specific requirements to achieve consistency.

Referred to the selection must be selected in the national standard parts, otherwise the changeability does not exist. Speaking of norms nothing less than the following: function according to national standards (strength, rust, shape ....);