Stainless steel non standard screws are partially black, how to deal with them?

My colleague received the sample sent by a customer today, which are stainless steel non standard screws with some parts blacked. The customer wants to solve the problems of screws’ black groove type and teeth. So, let’s see how we solved it!

Colleagues in the workshop used cleaning reagent, heated it to 70 degrees, soaked the wholesale black stainless steel non standard screws for 5-15 minutes, neutralized it in water, and then dried it. Finally, we solved the problem. According to the customer’s feedback, after installing the screws to the machine, he can also see its bright color. And this customer is very satisfied.

So, what are the reasons that stainless steel non standard screws blackened?

First, manufacturing process problems, when processing cold heading or rubbing teeth, the heat is too high. In the production process, you can not only through the supply of lubricating oil, making the heat of the machine timely dispersed, but also can reduce the speed of the machine to solve it.

Second, the screw’s material problem.

Shi Shi Tong Screw Manufacturer specializes in producing and customizing kinds of screws, such as stainless steel non standard screws. Welcome to your inquire.

Skype: kalyn qin M: +86 18818786322 Tel: +86 0755-27322278 annie@szsst88.com Add: No. 11, Dinghou Road, Dongfang Community, Songgang Street, Baoan District, Shenzhen, Guangdong, China