mushroom head self tapping screws, why change the surface treatment?

A few days ago, at 11 pm Beijing time in China, a customer Erik found the Shi Shi Tong screw manufacturer and asked if we could give him a mushroom head self tapping screws. Erik gave us the drawings of the screws.

After receiving an inquiry from Erik, the Shi Shi Tong screw manufacturer found that the surface was black zinc plated. Shi Shi Tong screw manufacturers have also done a few times before the carbon steel black-plated mushroom head self tapping screws to customers in other countries, but every time we ship the inspection, the surface of the screws is very good, there is no white appearance phenomenon. However, when the customer received it, the whiteness appeared on the head of the screw. The reason for this is mainly because of the collision during transportation, not only from the outside, but also the self-tapping thread will hurt the surface of the screw, which will also lead to whitening.

Therefore, we recommend that Erik replace the surface treatment of the mushroom head self tapping screws black zinc plated with a black oxide surface treatment. Erik said that it can be changed to a black oxide surface treatment, let us quote him the price of black oxide.

When we quoted Erik, we not only provided Erik with the price of the product but also provided Erik with the shipping cost. After receiving the price, Erik quickly asked if he could pay via Paypal. Shishi screw manufacturers can accept Paypal payments, and after providing an account to Erik, Erik will pay quickly.

If you want to know more about mushroom head self tapping screws please feel free to contact us at annie.li@szsst88.com