Which standards specify the classification and details regarding the performance grades or material grades of bolts and nuts?
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Which standards specify the classification and details regarding the performance grades or material grades of bolts and nuts? Things like 5.6, 6, 8.8, A2-50, etc., – what standard is used for such classification?
Reference can also be made to the standard ASTM A193/A193M-04b for alloy steel and stainless steel bolt materials for high-temperature applications
This post was last edited by FORREST_GUMP on 2015-11-10 at 15:24. Few errors in national standards have been identified. M48X3 was omitted from the standard; I’ve added it in.
Impressive. Some time ago, I remember there seemed to be some gaps in the pipeline standards as well; it’s hard to say for sure.
Many standards are created by people sitting in offices, so mistakes are inevitable. This reminds me of my senior year in high school, when the school purchased standardized review materials; there were so many mistakes in those materials. When I couldn’t solve a problem, I would ask the teacher for help, only to find that the teacher also couldn’t solve it – because the question itself was wrong. This happened quite often.
Writing isn’t a problem; what matters is reliability. I once heard someone say that domestic standards are based on foreign ones, but people are afraid of being accused of complete copying; so they make various changes, which ends up causing chaos.
I don’t think plagiarism is shameful; what’s terrifying is the lack of a sincere attitude as a student – failing to be a proper student while constantly thinking of surpassing one’s teachers. You see, these days many people start their statements by claiming that their devices and technologies are the first of their kind in China and lead the world. Whenever I come across such claims, one thing always comes to mind: What else can you do besides talking nonsense? 3 years ago, a friend of mine attended the MATLAB annual conference, where the General Manager for the Asian region (a foreigner) said: You Chinese people don’t like to spend money on legitimate software; you think it’s not worth it, and we can tolerate that to some extent ； But what we cannot accept is that you don’t study the software properly or make good use of it. President Wang, we’re going off-topic~~