The Inspection Method of Laptop Screw

The surface inspection of laptop screw is divided into two kinds. One inspection is before plating, and another one is after plating. That is to say, it is the inspection after the screw hardened and after surface treatment of screw. Before plating, we should inspect the dimension and tolerance of screw, and look whether it have reached national standards or customer requirements. After surface treatment of screw, we should inspect the plated screw. It mainly test the plating color and bad screws, etc. So that our laptop screw can be passed when the customers receive them. I will describe the inspection after screw treatment in detail below.

1.The appearance and quality requirements

Screw appearance inspection is inspected from the appearance, electroplated layer, etc.

2.The inspection of screw plating thickness

A. the method of measuring

The tools for measuring include micrometer, calipers, plug gauge, etc.

B. Magnetic method

The method is a non destructive measurement, using magnetic thickness gauge to measure the magnetic substrate non-magnetic coating layer.

C. microscopic method

It is also called the metallographic method. It is to put fasteners after etching on the metallographic microscope with a micrometer eyepiece amplification, measuring the section on the thickness of the coating.

D. Timing flow method

Timing flow method is used to dissolve the coating solution lingers on coating of local surface, according to the time required to the local plating solution, to calculate the thickness of the coating.

   Those are all the inspection method of laptop screw. And there also are many other methods. If you want to know more about screws, you can contact us. We are a professional China screw manufacturer. We will try our best to help you!

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Dongguan King-Tower Hardware Co., Ltd is one of the largest enterprises to produce in China. China screw manufacturer choose King-Tower. Our company produces all kinds of sem screws, safety screws, Chiacgo screws, special screws, customized screws, plastic head screws, Lathe screws, and Professional screw, to meet various standard requests from different countries. All the equipment is introduced from the United States, Japan and Taiwan. Good equipment, consummate craft and strict management enable the quality of the products and service standard to reach the level of international market.

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