Q:What is the meaning of the screw and the 4 and 8?

Strength grade 4.8, nominal tensile strength of 400MPA products, yield strength 320 (nominal 80%). For details, please refer to GB3098.1 or ISO898-1. There are all indicators

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:Why the screw thread more closely, spin into the more effort?

Screw thread more dense, indicating the screw thread deep and shallow, the screw in the advance the resistance of the smaller, when the spin naturally more effort.

Q:Why a screwdriver can suck the screw

Bolt knife head with magnetic, and in the installation of small screws

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

M is the large diameter of the screw, the diameter of the screw top of the bolt, or the diameter of the screw bottom of the nut

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:What is the size of the screw for the wall power switch installation

Concealed switch generally M5 × 30 semi-round head screws, you can also use M4 × 30 tapping screws. Ming installed switch is used M5 expansion with M5's self-tapping screws.

Q:What is the difference between Chinese-made screws and US screws?

China-made screws and the United States is no essential difference between the screws, and now the world are using the screws in China.

Q:How does the screw twist?

For the "word" and "cross" head screws can be upright screwdriver, vibration screwdriver back (pay attention to intensity), and then twist.

Q:How did the scrHow did the screw become round?ew become round?

(1) in the screwdriver head pad things such as double-sided adhesive, non-woven fabrics, etc. If there is no condition, then the paper can be, so you can increase the friction. (2) with a small amount of 502 glue into the screw hole, and then screw into the screw, and so the glue after the solid tip and then use the tip of the screw to pull out the screw (only the screwdriver is not afraid of causing screw teeth). (3) fruit screw cap exposed, you can use the tip of the clamp clamp screw cap after the screw. (4) the general mobile phone screws are metal, the case is plastic, not screw down when the time. You can use the tip of the screw into the screw cap, the metal screws to screw the plastic around the plastic melting, with the tip of the clamp clamp, gently pull out! You can also force down the screws about 1 mm (be careful not to engage in the chassis), you can solve the problem of loose screws. (5) so little the screw is not easy to get, my father had to repair the original bike screw method, with a small electric drill in the middle of the screw to play a not deep hole, and then find an anti-silk tap into the (must Anti-wire tap, it is difficult to find, to go to a large measuring blade cutting shop), you can unscrew the.