What is the classification code of machine tools?

Classification code is the Arabic numeral before the category code, which is used to distinguish when the category code is insufficient and the cutting method is consistent but the machine tool form and function are different. The first sentence upstairs says that the country has unified rules, but its example is not accurate. Its example is that the group code is confused with classification code.

In fact, accurately speaking, the classification code generally refers to grinder, M, 2M, 3M, M3 refers to grinder, 2M3 refers to plane and spherical honing machine, and 3M3 refers to bearing ring superfinishing machine.

The "3" at the back is the group code, and the number at the front is classification code.

Tpx611b, the last six bits are all group codes, so it has nothing to do with classification code.

The answer I gave you was classification code, didn't you get it?