When judging the quality of gears, the accuracy grade of the tolerance group is an important reference indicator. The following are examples for your illustration:
Example 1: 7 — 6 — 6 GM GB10095 – 88
Here, “7” indicates the accuracy grade of the first tolerance group; the first “6” represents the accuracy grade of the second tolerance group; the second “6” is the accuracy grade of the third tolerance group. “G” is the code for the upper deviation of tooth thickness, “M” is the code for the lower deviation of tooth thickness, and “GB10095 – 88” is the national standard number (promulgated in 1988, with the number 10095), often used in reducers.
Example 2: 7 FL GB10095 – 88
In this example, “7” represents the accuracy grades of the first, second, and third tolerance groups simultaneously, “F” is the code for the upper deviation of tooth thickness, and “L” is the code for the lower deviation of tooth thickness.
Example 3: – 0.330
— 4 GB10095 – 88
— – 0.495
Among them, “4” represents the accuracy grades of the first, second, and third tolerance groups, ” – 0.330″ is the value of the upper deviation of tooth thickness, and ” – 0.495″ is the value of the lower deviation of tooth thickness.
It should be noted that among the accuracy grades of the first, second, and third tolerance groups, the smaller the number, the higher the accuracy of the gear.