Foundation bolt locking phenomenon
Thread Content
The steel construction anchor bolts are what we refer to as high-strength bolts; some people also prefer to call them high-strength bolt assemblies. It is also very convenient when installing the foundation bolts for steel structures; a wrench is usually sufficient for the task. However, some friends said that after using bolts from certain manufacturers, they found that some of those bolts became stuck. First of all, when choosing steel structural anchor bolts, it is necessary to carefully consider what strength grade they have. There are several different hardness levels, or strength grades, for steel structural anchor bolts; these include 8.8 grade, 10.9 grade, and even higher grades such as 12.9 grade. Therefore, when choosing to use steel structural anchor bolts, we need to clearly identify which strength grade they belong to. For example, the tensile strength of the screw and the load capacity guaranteed by the nut. This is a bento box. Additionally, the length of the screws used in steel structures should also be chosen appropriately; it is best for one to two thread pitches of the nut to be visible after tightening. Another reason that can cause locking of steel structure anchor bolts is believed to be related to rough thread surfaces or the presence of foreign objects; for example, weld spots and other metal shavings trapped between the threads can often lead to locking of the steel structure anchor bolts and nuts. Another point is that excessive force may be caused by locking too quickly; therefore, when installing the foundation bolts of steel structures, a torque wrench should be used to tighten the nuts, or a socket wrench can also be used. These are also intended to prevent the occurrence of bolt locking issues. There are also some minor issues: problems with the direction and angle when tightening screws can cause the anchor bolts of steel structures to lock up.
Thank you to the original poster for sharing their experience :):):):):):):):):):), I’ll save it
Persistence is key in everything; it’s truly admirable that the original poster keeps sharing professional knowledge with fellow sailors, and this deserves praise!
The original poster’s post is good; giving it a like. Keep going with the introductions
This post was last edited by wanlirn on 2020-7-20 at 15:21. The locking issue occurs when the strength of the nuts and bolts is not chosen appropriately； The strength grade of the nut should be one level lower than that of the bolt. In simple terms, the nut should be softer than the bolt. Don’t even the professional manufacturers of bolts know this basic principle?
It are migrant workers who tighten the screws; it makes no difference whether you say anything or not. Some of them don’t even do it properly and just use spot welding instead. There aren’t any at all; there are too many. Some are very few.
The result of shoddy work by the manufacturing unit