Q:For the commonly used standard parts, for some of the quality of good or bad, how to distinguish,

According to the relevant standards, such as size, appearance, thread quality, surface finish, through the rules, hardness, etc., should be considered, according to the standard about.

Q:Inside the hexagonal screws, rather not down, it may be too much screw on the screw too tight has been bad 3 screwdriver screw is too small also one-half of rice grain please help think about ways

Look at the picture that the screw is not damaged, it may be removed. First of all, be sure to use the appropriate six-way wrench, can not use a common font and cross-shaped screwdriver. Second, with the heating method to remove, from the picture point of view around the screw are metal structure, with alcohol torch heating or high-power electric iron local heating, softening the plastic, hot disassembly, should be able to remove.

Q:Thank you for your support

Depends on where to use!The spring washer is used in the mechanical combination to fasten the anti vibration and non seal components!

Q:Want to fix something, which is a triple iron (do not know how thick), would like to ask what screws can be turned into? Can ordinary drill go in? The question is to consider the drill or consider the screw, or have to consider? Thank you! The

Self tapping screw is a screw, on, do not have to pre-open the thread, it will spin out the thread, the Chinese name "self-tapping screws."

Q:A general set of screws have a few nuts, bolts, washers?

You want to see the specific requirements and uses. There is also a nut, a bolt, and a flat pad

Q:I would like to know the specifications of the two types of screws models, including length, diameter, diameter and pitch, etc.

M3: pitch: 0.5; diameter: 2.675; diameter: 2.459; outer diameter: 3; length: 6,8,10,12,16,18,20,25,30 (GB5783-86 specified length specifications) M6: Pitch: 1; diameter: 5.350; trail: 4.917; outer diameter: 6; length: 6,8,10,12,16,18,20,25,30,35,40,60. (GB5783-86 specified length specifications)

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?

Drill a properly sized hole on the jumper screw, insert a pyramid or change it into a reverse thread, and screw the screw in the reverse thread and then unscrew the screw in the usual way.

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?

From the use, do not distinguish between positive and negative. From the beautiful, bright flat surface, outward

Q:how to use Motor washer

Halo, brother, your question also detailed ah, there are a lot of places on a motor washer ah, do you mean where ah, you have to iron or plastic washers, spring washers, I think it is the plastic washer, mainly plastic washer 1 are leak proof, waterproof, anti oil,... 2 insulation, high pressure resistance, 3, vibration reduction, 4, reduce wear, basically on these several functions