Why does brass machine screw some dim and dark surface , some have bright surface?

I’m often asked why some brass machine screw look bright, but some are dark. Today, the Shi Shi Tong screw manufacturer will answer for you.

(1) Different components

Just like people, although brothers and sisters are born to one parent, it is also possible that they are different in height, fat and thin. What we mean here is that although all the brass machine screw are made of H59, H62, H65, H68, H70, H80, H85, H90, H96 and so on, the number indicates the degree of copper content. The most commonly used screws are H59 copper and H62 copper and H65 copper. Shenzhen Shi Shi Tong metal products Co., Ltd. specializes in producing all kinds of non-standard brass screws.

(2) different environments

The environment used by screws will also affect the surface finish of screws. Because copper is a very oxidizable metal, water vapor and air (containing CO2 and oxygen) can be oxidized under natural conditions. So try to work in a dry and cool environment as far as possible.

(3) Different surface treatments.

If you want to make the brass machine screw brighter, you can polish it, or electroplate it to protect it from oxidation.

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