Internal And External Thread Nut

In daily life, we will find that most nuts are galvanized. Do you know the reason? Let's talk about it today.

Why should nuts be galvanized?

The commonly used Grade 8 nuts and Grade 4 nuts need galvanizing treatment. One is to look good. The surface of the Internal And External Thread Nut before galvanizing is natural color and looks gray, which has little appreciation value. The surface of the Galvanized Steel Nuts is very bright, and it can also be plated with white zinc, blue-white zinc, color zinc, etc.

The second reason why Internal And External Thread Nut are galvanized is of course to prevent rust. Internal And External Thread Nut will be produced after two or three months of use, while Galvanized Steel Nuts nuts can be used for five years without rust, so the effect of galvanized rust prevention is still very good.

The third advantage of Galvanized Steel Nuts is to facilitate installation. In the first step of the installation, most nuts need to be screwed with a few threads by hand and then tightened with tools. If they are not galvanized, the nut surface will either have an oil stain, which will dirty the hands. If they wear gloves, they are not sensitive to operation. Or there are burrs, which are easy to make by hand. Therefore, the installation of non galvanized nuts is still time-consuming and laborious, and the Galvanized Steel Nuts can be screwed directly by hand, which is very convenient and fast.

The standard for Galvanized Steel Nuts

Although nut galvanizing is simple and commonly used, the thread after galvanizing has to be tested by go no go gauge. Therefore, in the industry galvanizing, some relevant standards have been formulated, which are implemented by the specification documents of GB5267. This standard marks the thickness and anti-corrosion time of the zinc coating. Since the nuts are internal threads, to prevent the internal threads from being zinc plated, the tolerance of the zinc coating will be controlled at about 15 microns, This is an upper limit tolerance, and the thickness standard of the bolt is about 7 microns. The upper limit tolerance of the nut is to ensure that the internal thread can be plated with zinc. Therefore, sometimes the Galvanized Steel Nuts fail to pass the general specification. It is acceptable as long as the conditions permit, because it is not a quality problem, but caused by the zinc layer.

Measuring the zinc layer thickness of the Internal And External Thread Nut is very simple. The early drip method or timed liquid flow method are eliminated. We only need to buy a small hand-held instrument and read its zinc layer thickness parameters next to the nut. At present, the price of electro galvanizing has increased slightly, but in the long run, this upward trend will continue. There are many specifications of Galvanized Steel Nuts.

We are the leading Internal And External Thread Nut supplier, we also supply Zinc Plated Nuts and Turnbuckle Nut, any interests, plz feel free to contact us.