How many specifications are there for aluminum pipe?

Our commonly used aluminum pipe diameter is generally OD 28mm. In fact, aluminum pipe size is far more than these. There are 5 kinds of customized sizes in mold opening alone. 

Today I'm going to introduce you to one of them:

The diameter of this model is 27.9mm. If you don't use calipers, you can't see the difference with 28mm. Its wall thickness is 1.6-1.7mm, which is relatively thick for aluminum pipes. It can also be fitted with ordinary aluminium pipe fittings.

With the development of the industry, aluminum pipes are also used more widely, the major factories are more strict requirements for its material, so SUNQIT aluminum pipe lean tube is also very popular in the industry. If there are any other problems, welcome to consult !