threadpro（スレッドプロ）で従来jis２級のねじ精度を加工するには？(スレッドミル) | オーエスジー

On the thread size selection screen of Thread Pro, select Thread Accuracy: 5H (Aim: 75%).

In Thread Pro, there is no conventional JIS thread accuracy in the thread accuracy item.
The conventional JIS has a thread accuracy of 6H, which corresponds to JIS Class 2, but the actual tolerance of the screw is close to 5H.

If you are aiming for the conventional JIS2 grade thread accuracy with Thread Pro, we recommend aiming at 5H 75%.

Positional relationship of female thread accuracy 6H, 5H, 2nd grade (II.)

(1): Effective diameter reference dimension