Generally speaking, no matter what type of screw, they will have their own role. For example, the head with serration, is generally in order to prevent slip, screw screw part point with blue glue, is to make the screw in the assembly after more difficult to fall out, the fastening effect is better. So what does the washer head screws do? washer head screws is generally the finger with washer, rather than the screw head under the flat washer, spring washer. This screw is generally to increase the area of contact between the screw and the object, reducing friction. At the same time also save wear flat pad, spring pad time, prevent screw loose. And washer head screws can be made with pan head, cup head, big flat head is flat to make a screw with washer, and countersunk head, half countersunk head is not made with washer head screw. In addition, the diameter of meson can be large or small. For example, for the screw M6 of some customers, the diameter of meson may be made into ...
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