Questions regarding the specifications of HG20652 bolts
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In HG20652 P20, all the bolts use fine-threaded threads. Why is that? What are the differences between fine-thread and coarse-thread in terms of machining and stress resistance?
The standard specifies that if it’s fine-threaded, then it is fine-threaded; for coarse-threaded ones, look to other standards. There shouldn’t be much difference in processing; fine teeth are subjected to less stress.
Fine teeth have a tight fit when occluding, while coarse teeth have a poor fit
What was said upstairs is correct; from a stress perspective, fine teeth provide tighter fitting, while coarse teeth offer poorer fitting. From a manufacturing standpoint, the main difference lies in the amount of material removed per cut. But I think using coarse threads should work too; don’t other industries use coarse threads as well? The anchor bolts for various types of hydraulic presses, air compressors, chimneys, street lamp posts, etc., are all coarse-threaded.
I on the 3rd floor support it; selections should be made strictly in accordance with the standards
Fine teeth are generally not used, can you take a screenshot of the specifications to show?