What does the red circled area in the diagram represent?
Thread Content
What does H7/Js6 K7/h6 mean in the diagram along with the code?
Where can I find this data? Please recommend some sources
Could you recommend some materials on this topic?
GB/T 1800-2020
GB1800-1804
Have you studied tolerances and fits? Those who have studied science or engineering in college know this, right?
The uppercase letter at the beginning indicates the H system for hole sizing; if it’s not H, then it’s the shaft system. The number represents the precision grade. Using H as a reference point, the hole sizes increase in the order ABCD, while the shaft sizes decrease in the same order. H corresponds to zero tolerance. For example, in H7/e6, since e comes before H, and as mentioned earlier shaft sizes increase, e indicates a small tolerance value. Since H is still at zero tolerance, this is a clearance fit. Similarly, in H7/p6, P comes after H, so this is a interference fit. There are several grades in the transition range: j, js, k, m, n